如何设置图像壁纸，在图像时用户点击？ [英] How to set image wallpaper, when user click on Image?

问题描述

我是新来的编码，并与它之前从来没有做过！我的壁纸应用程序的工作是我创造的画廊。我成功地做到这一点，但我想修改应用程序，这样，当用户点击特定的图像这让他们设置为墙纸。我需要一些帮助这个！ （对不起，我英文不好）

有谁知道我应该怎么做呢？真的感谢帮助

以下是我的code ...

MainActivity的.java

 进口的java.util.ArrayList;
进口的java.util.List;进口android.app.Activity;
进口android.graphics.Bitmap;
进口android.graphics.drawable.BitmapDrawable;
进口android.graphics.drawable.Drawable;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.AdapterView;
进口android.widget.AdapterView.OnItemSelectedListener;
进口android.widget.Gallery;
进口android.widget.ImageView;
进口android.widget.ImageView.ScaleType;公共类GalleryDemoActivity延伸活动{    私人ImageView的selectedImageView;    私人ImageView的leftArrowImageView;    私人ImageView的rightArrowImageView;    私人画廊的画廊;    私人INT selectedImagePosition = 0;    私人列表＆LT;＆可绘制GT;可绘制;    私人GalleryImageAdapter galImageAdapter;    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;        getDrawablesList（）;
        setupUI（）;
    }    私人无效setupUI（）{        selectedImageView =（ImageView的）findViewById（R.id.selected_imageview）;
        leftArrowImageView =（ImageView的）findViewById（R.id.left_arrow_imageview）;
        rightArrowImageView =（ImageView的）findViewById（R.id.right_arrow_imageview）;
        画廊=（图库论坛）findViewById（R.id.gallery）;        leftArrowImageView.setOnClickListener（新OnClickListener（）{            @覆盖
            公共无效的onClick（视图v）{                如果（selectedImagePosition大于0）{
                    --selectedImagePosition;                }                gallery.setSelection（selectedImagePosition，FALSE）;
            }
        }）;        rightArrowImageView.setOnClickListener（新OnClickListener（）{            @覆盖
            公共无效的onClick（视图v）{                如果（selectedImagePosition＆下; drawables.size（） -  1）{
                    ++ selectedImagePosition;                }                gallery.setSelection（selectedImagePosition，FALSE）;            }
        }）;        gallery.setOnItemSelectedListener（新OnItemSelectedListener（）{            @覆盖
            公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT POS，长I​​D）{                selectedImagePosition = POS;                如果（selectedImagePosition大于0＆放大器;＆放大器; selectedImagePosition＆下; drawables.size（） -  1）{                    leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_enabled））;
                    rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_enabled））;                }否则如果（selectedImagePosition == 0）{                    leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_disabled））;                }否则如果（selectedImagePosition == drawables.size（） -  1）{                    rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_disabled））;
                }                changeBorderForSelectedImage（selectedImagePosition）;
                setSelectedImage（selectedImagePosition）;
            }            @覆盖
            公共无效onNothingSelected（适配器视图＆LT;＆GT;为arg0）{            }        }）;        galImageAdapter =新GalleryImageAdapter（本，图形）;        gallery.setAdapter（galImageAdapter）;        如果（drawables.size（）大于0）{            gallery.setSelection（selectedImagePosition，FALSE）;        }        如果（drawables.size（）== 1）{            rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_disabled））;
        }    }    私人无效changeBorderForSelectedImage（INT selectedItemPos）{        诠释计数= gallery.getChildCount（）;        的for（int i = 0; I＆LT;计数;我++）{            ImageView的ImageView的=（ImageView的）gallery.getChildAt（I）
            imageView.setBackgroundDrawable（getResources（）getDrawable（R.drawable.image_border））;
            imageView.setPadding（3,3，3,3）;        }        ImageView的ImageView的=（ImageView的）gallery.getSelectedView（）;
        imageView.setBackgroundDrawable（getResources（）getDrawable（R.drawable.selected_image_border））;
        imageView.setPadding（3,3，3,3）;
    }    私人无效getDrawablesList（）{        可绘制=新的ArrayList＆LT;＆可绘制GT;（）;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage1））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage2））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage3））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage4））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage5））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage6））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage7））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage8））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage9））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage10））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage11））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage12））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage13））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage14））;
        drawables.add（getResources（）getDrawable（R.drawable.natureimage15））;    }    私人无效setSelectedImage（INT selectedImagePosition）{        BitmapDrawable BD =（BitmapDrawable）drawables.get（selectedImagePosition）;
        位图B = Bitmap.createScaledBitmap（bd.getBitmap（），（INT）（bd.getIntrinsicHeight（）* 0.9），（INT）（bd.getIntrinsicWidth（）* 0.7），假）;
        selectedImageView.setImageBitmap（二）;
        selectedImageView.setScaleType（ScaleType.FIT_XY）;    }
}
 

GalleryAdapter。 java的

 进口的java.util.List;进口android.app.Activity;
进口android.graphics.drawable.Drawable;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.BaseAdapter;
进口android.widget.Gallery;
进口android.widget.ImageView;公共类GalleryImageAdapter延伸BaseAdapter {    私人活动范围内;    私有静态ImageView的ImageView的;    私人列表＆LT;＆可绘制GT; plotsImages;    私有静态ViewHolder持有人;    公共GalleryImageAdapter（Activity上下文，列表＆LT;＆可绘制GT; plotsImages）{        this.context =背景;
        this.plotsImages = plotsImages;    }    @覆盖
    公众诠释的getCount（）{
        返回plotsImages.size（）;
    }    @覆盖
    公共对象的getItem（INT位置）{
        返回null;
    }    @覆盖
    众长getItemId（INT位置）{
        返回0;
    }    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{        如果（convertView == NULL）{            持有人=新ViewHolder（）;            ImageView的=新ImageView的（this.context）;            imageView.setPadding（3,3，3,3）;            convertView = ImageView的;            holder.imageView = ImageView的;            convertView.setTag（保持器）;        }其他{            支架=（ViewHolder）convertView.getTag（）;
        }        holder.imageView.setImageDrawable（plotsImages.get（位置））;        holder.imageView.setScaleType（ImageView.ScaleType.FIT_XY）;
        holder.imageView.setLayoutParams（新Gallery.LayoutParams（150，90））;        返回ImageView的;
    }    私有静态类ViewHolder {
        ImageView的ImageView的;
    }}
 

main.xml中

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;的RelativeLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：背景=@机器人：彩色/白
    机器人：方向=垂直＆GT;    ＆LT; ImageView的
        机器人：ID =@ + ID / selected_imageview
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =FILL_PARENT
        机器人：layout_above =@ + ID / gallery_relative_layout
        机器人：layout_marginLeft =30dip
        机器人：layout_marginRight =30dip
        机器人：layout_marginTop =30dip/＆GT;    ＆LT; RelativeLayout的
        机器人：ID =@ + ID / gallery_relative_layout
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =150dip
        机器人：layout_alignParentBottom =真
        机器人：方向=横向＆GT;        ＆LT; ImageView的
            机器人：ID =@ + ID / left_arrow_imageview
            机器人：layout_width =WRAP_CONTENT
            机器人：layout_height =WRAP_CONTENT
            机器人：layout_centerVertical =真
            机器人：layout_marginLeft =15dip
            机器人：SRC =@绘制/ arrow_left_disabled/＆GT;        ＆LT;画廊
            机器人：ID =@ + ID /画廊
            机器人：layout_width =0dip
            机器人：layout_height =150dip
            机器人：layout_marginLeft =20dip
            机器人：layout_marginRight =20dip
            机器人：layout_toLeftOf =@ + ID / right_arrow_imageview
            机器人：layout_toRightOf =@ + ID / left_arrow_imageview
            机器人：间距=20dip/＆GT;        ＆LT; ImageView的
            机器人：ID =@ + ID / right_arrow_imageview
            机器人：layout_width =WRAP_CONTENT
            机器人：layout_height =WRAP_CONTENT
            机器人：layout_alignParentRight =真
            机器人：layout_centerVertical =真
            机器人：layout_marginRight =15dip
            机器人：SRC =@绘制/ arrow_right_enabled/＆GT;
    ＆LT; / RelativeLayout的＆GT;＆LT; / RelativeLayout的＆GT;
 

的Manifest.xml

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;清单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=com.gallerydemo
    安卓版code =1
    机器人：=的versionName1.0＆GT;    ＆LT;采用-SDK安卓的minSdkVersion =8/＆GT;    ＆lt;应用
        机器人：图标=@绘制/ ic_launcher
        机器人：标签=@字符串/ APP_NAME＆GT;
        ＆LT;活动
            机器人：名字=。GalleryDemoActivity
            机器人：标签=@字符串/ APP_NAME＆GT;
            ＆所述;意图滤光器＆gt;
                ＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT;                ＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
            ＆所述; /意图滤光器＆gt;
        ＆LT; /活性GT;
    ＆LT; /用途＆gt;＆LT; /清单＆GT;
 

解决方案

是

图片点击监听器：

  ImageView的IMG =（ImageView的）findViewById（R.id.myImageId）;
img.setOnClickListener（新OnClickListener（）{
    公共无效的onClick（视图v）{
      WallpaperManager myWallpaperManager
     = WallpaperManager.getInstance（getApplicationContext（））;
    尝试{
     位图的位图=（（BitmapDrawable）img.getDrawable（））getBitmap（）;
     如果（位图！= NULL）
     myWallpaperManager.setBitmap（位图）;
    }赶上（IOException异常五）{
     // TODO自动生成catch块
     e.printStackTrace（）;
    }
    }
}）;
 

我认为像下面将在code工作：

  gallery.setOnItemSelectedListener（新OnItemSelectedListener（）{            @覆盖
            公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT POS，长I​​D）{                selectedImagePosition = POS;                如果（selectedImagePosition大于0＆放大器;＆放大器; selectedImagePosition＆下; drawables.size（） -  1）{                    leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_enabled））;
                    rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_enabled））;                }否则如果（selectedImagePosition == 0）{                    leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_disabled））;                }否则如果（selectedImagePosition == drawables.size（） -  1）{                    rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_disabled））;
                }                changeBorderForSelectedImage（selectedImagePosition）;
                setSelectedImage（selectedImagePosition）;selectedImageView .setOnClickListener（新OnClickListener（）{
            公共无效的onClick（视图v）{
              WallpaperManager myWallpaperManager
             = WallpaperManager.getInstance（getApplicationContext（））;
            尝试{
             位图的位图=（（BitmapDrawable）selectedImageView .getDrawable（））getBitmap（）;
             如果（位图！= NULL）
             myWallpaperManager.setBitmap（位图）;
            }赶上（IOException异常五）{
             // TODO自动生成catch块
             e.printStackTrace（）;
            }
            }
        }）;
            }
 

或类似的东西如下：

  gallery.setOnItemSelectedListener（新OnItemSelectedListener（）{                @覆盖
                公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT POS，长I​​D）{                    selectedImagePosition = POS;                    如果（selectedImagePosition大于0＆放大器;＆放大器; selectedImagePosition＆下; drawables.size（） -  1）{                        leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_enabled））;
                        rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_enabled））;                    }否则如果（selectedImagePosition == 0）{                        leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_disabled））;                    }否则如果（selectedImagePosition == drawables.size（） -  1）{                        rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_disabled））;
                    }                    changeBorderForSelectedImage（selectedImagePosition）;
                    setSelectedImage（selectedImagePosition）;ImageView的ImageView的=（ImageView的）gallery.getSelectedView（）;    imageView.setOnClickListener（新OnClickListener（）{
                公共无效的onClick（视图v）{
                  WallpaperManager myWallpaperManager
                 = WallpaperManager.getInstance（getApplicationContext（））;
                尝试{
                 位图的位图=（（BitmapDrawable）imageView.getDrawable（））getBitmap（）;
                 如果（位图！= NULL）
                 myWallpaperManager.setBitmap（位图）;
                }赶上（IOException异常五）{
                 // TODO自动生成catch块
                 e.printStackTrace（）;
                }
                }
            }）;
         }
 

请确保您有下面的权限在AndroidManifest.xml中，只是把它下面和上面：

 ＆LT;使用许可权的android：NAME =android.permission.SET_WALLPAPER/＆GT;
 

有关对话框出现，等待3秒来打开它：

  gallery.setOnItemSelectedListener（新OnItemSelectedListener（）{                    @覆盖
                    公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT POS，长I​​D）{                        selectedImagePosition = POS;                        如果（selectedImagePosition大于0＆放大器;＆放大器; selectedImagePosition＆下; drawables.size（） -  1）{                            leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_enabled））;
                            rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_enabled））;                        }否则如果（selectedImagePosition == 0）{                            leftArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_left_disabled））;                        }否则如果（selectedImagePosition == drawables.size（） -  1）{                            rightArrowImageView.setImageDrawable（getResources（）getDrawable（R.drawable.arrow_right_disabled））;
                        }                        changeBorderForSelectedImage（selectedImagePosition）;
                        setSelectedImage（selectedImagePosition）;    ImageView的ImageView的=（ImageView的）gallery.getSelectedView（）;        imageView.setOnClickListener（新OnClickListener（）{
                    公共无效的onClick（视图v）{
                     处理程序处理程序=新的处理程序（）;
                 handler.postDelayed（新的Runnable（）{                    @覆盖
                    公共无效的run（）{                        AlertDialog.Builder myAlertDialog =新AlertDialog.Builder（GalleryDemoActivity.this）;
                         myAlertDialog.setTitle（墙纸）;
                         myAlertDialog.setMessage（要设置为墙纸？）;
                         myAlertDialog.setPositiveButton（OK，新DialogInterface.OnClickListener（）{                          公共无效的onClick（DialogInterface对话框，INT ARG1）{
                              WallpaperManager myWallpaperManager
                                 = WallpaperManager.getInstance（getApplicationContext（））;
                                尝试{
                                 位图的位图=（（BitmapDrawable）imageView.getDrawable（））getBitmap（）;
                                 如果（位图！= NULL）
                                 myWallpaperManager.setBitmap（位图）;
                                }赶上（IOException异常五）{
                                 // TODO自动生成catch块
                                 e.printStackTrace（）;
                                }
                          }}）;
                         myAlertDialog.setNegativeButton（取消，新DialogInterface.OnClickListener（）{                          公共无效的onClick（DialogInterface对话框，INT ARG1）{
                         dialog.dismiss（）;
                          }}）;
                         。myAlertDialog.create（）显示（）;
                    }                 }，3000）;
                    }
                }）;
             }
 

I am new to coding and never worked with it before! I am working on wallpaper application were I created the gallery . I managed to do this , but I want to modify the app so that when user click on specific image It allow them to set as wallpaper. I need some help with this! (Sorry for bad English)

Does anyone know how I should do this? Really thankful for help

Following are my code...

MainActivity .java

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class GalleryDemoActivity extends Activity {

    private ImageView selectedImageView;

    private ImageView leftArrowImageView;

    private ImageView rightArrowImageView;

    private Gallery gallery;

    private int selectedImagePosition = 0;

    private List<Drawable> drawables;

    private GalleryImageAdapter galImageAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        getDrawablesList();
        setupUI();
    }

    private void setupUI() {

        selectedImageView = (ImageView) findViewById(R.id.selected_imageview);
        leftArrowImageView = (ImageView) findViewById(R.id.left_arrow_imageview);
        rightArrowImageView = (ImageView) findViewById(R.id.right_arrow_imageview);
        gallery = (Gallery) findViewById(R.id.gallery);

        leftArrowImageView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if (selectedImagePosition > 0) {
                    --selectedImagePosition;

                }

                gallery.setSelection(selectedImagePosition, false);
            }
        });

        rightArrowImageView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if (selectedImagePosition < drawables.size() - 1) {
                    ++selectedImagePosition;

                }

                gallery.setSelection(selectedImagePosition, false);

            }
        });

        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                selectedImagePosition = pos;

                if (selectedImagePosition > 0 && selectedImagePosition < drawables.size() - 1) {

                    leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_enabled));
                    rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_enabled));

                } else if (selectedImagePosition == 0) {

                    leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_disabled));

                } else if (selectedImagePosition == drawables.size() - 1) {

                    rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_disabled));
                }

                changeBorderForSelectedImage(selectedImagePosition);
                setSelectedImage(selectedImagePosition);
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {

            }

        });

        galImageAdapter = new GalleryImageAdapter(this, drawables);

        gallery.setAdapter(galImageAdapter);

        if (drawables.size() > 0) {

            gallery.setSelection(selectedImagePosition, false);

        }

        if (drawables.size() == 1) {

            rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_disabled));
        }

    }

    private void changeBorderForSelectedImage(int selectedItemPos) {

        int count = gallery.getChildCount();

        for (int i = 0; i < count; i++) {

            ImageView imageView = (ImageView) gallery.getChildAt(i);
            imageView.setBackgroundDrawable(getResources().getDrawable(R.drawable.image_border));
            imageView.setPadding(3, 3, 3, 3);

        }

        ImageView imageView = (ImageView) gallery.getSelectedView();
        imageView.setBackgroundDrawable(getResources().getDrawable(R.drawable.selected_image_border));
        imageView.setPadding(3, 3, 3, 3);
    }

    private void getDrawablesList() {

        drawables = new ArrayList<Drawable>();
        drawables.add(getResources().getDrawable(R.drawable.natureimage1));
        drawables.add(getResources().getDrawable(R.drawable.natureimage2));
        drawables.add(getResources().getDrawable(R.drawable.natureimage3));
        drawables.add(getResources().getDrawable(R.drawable.natureimage4));
        drawables.add(getResources().getDrawable(R.drawable.natureimage5));
        drawables.add(getResources().getDrawable(R.drawable.natureimage6));
        drawables.add(getResources().getDrawable(R.drawable.natureimage7));
        drawables.add(getResources().getDrawable(R.drawable.natureimage8));
        drawables.add(getResources().getDrawable(R.drawable.natureimage9));
        drawables.add(getResources().getDrawable(R.drawable.natureimage10));
        drawables.add(getResources().getDrawable(R.drawable.natureimage11));
        drawables.add(getResources().getDrawable(R.drawable.natureimage12));
        drawables.add(getResources().getDrawable(R.drawable.natureimage13));
        drawables.add(getResources().getDrawable(R.drawable.natureimage14));
        drawables.add(getResources().getDrawable(R.drawable.natureimage15));

    }

    private void setSelectedImage(int selectedImagePosition) {

        BitmapDrawable bd = (BitmapDrawable) drawables.get(selectedImagePosition);
        Bitmap b = Bitmap.createScaledBitmap(bd.getBitmap(), (int) (bd.getIntrinsicHeight() * 0.9), (int) (bd.getIntrinsicWidth() * 0.7), false);
        selectedImageView.setImageBitmap(b);
        selectedImageView.setScaleType(ScaleType.FIT_XY);

    }
}

GalleryAdapter. java

import java.util.List;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class GalleryImageAdapter extends BaseAdapter {

    private Activity context;

    private static ImageView imageView;

    private List<Drawable> plotsImages;

    private static ViewHolder holder;

    public GalleryImageAdapter(Activity context, List<Drawable> plotsImages) {

        this.context = context;
        this.plotsImages = plotsImages;

    }

    @Override
    public int getCount() {
        return plotsImages.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {

            holder = new ViewHolder();

            imageView = new ImageView(this.context);

            imageView.setPadding(3, 3, 3, 3);

            convertView = imageView;

            holder.imageView = imageView;

            convertView.setTag(holder);

        } else {

            holder = (ViewHolder) convertView.getTag();
        }

        holder.imageView.setImageDrawable(plotsImages.get(position));

        holder.imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        holder.imageView.setLayoutParams(new Gallery.LayoutParams(150, 90));

        return imageView;
    }

    private static class ViewHolder {
        ImageView imageView;
    }

}

Main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/selected_imageview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/gallery_relative_layout"
        android:layout_marginLeft="30dip"
        android:layout_marginRight="30dip"
        android:layout_marginTop="30dip" />

    <RelativeLayout
        android:id="@+id/gallery_relative_layout"
        android:layout_width="fill_parent"
        android:layout_height="150dip"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/left_arrow_imageview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="15dip"
            android:src="@drawable/arrow_left_disabled" />

        <Gallery
            android:id="@+id/gallery"
            android:layout_width="0dip"
            android:layout_height="150dip"
            android:layout_marginLeft="20dip"
            android:layout_marginRight="20dip"
            android:layout_toLeftOf="@+id/right_arrow_imageview"
            android:layout_toRightOf="@+id/left_arrow_imageview"
            android:spacing="20dip" />

        <ImageView
            android:id="@+id/right_arrow_imageview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="15dip"
            android:src="@drawable/arrow_right_enabled" />
    </RelativeLayout>

</RelativeLayout>

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gallerydemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".GalleryDemoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

解决方案

Yes.

Image click listener:

ImageView img = (ImageView) findViewById(R.id.myImageId);
img.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
      WallpaperManager myWallpaperManager
     = WallpaperManager.getInstance(getApplicationContext());
    try {
     Bitmap bitmap=((BitmapDrawable)img.getDrawable()).getBitmap();
     if(bitmap!=null)
     myWallpaperManager.setBitmap(bitmap);
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    }
});

I think something like below would work in your code:

    gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                selectedImagePosition = pos;

                if (selectedImagePosition > 0 && selectedImagePosition < drawables.size() - 1) {

                    leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_enabled));
                    rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_enabled));

                } else if (selectedImagePosition == 0) {

                    leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_disabled));

                } else if (selectedImagePosition == drawables.size() - 1) {

                    rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_disabled));
                }

                changeBorderForSelectedImage(selectedImagePosition);
                setSelectedImage(selectedImagePosition);

selectedImageView .setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
              WallpaperManager myWallpaperManager
             = WallpaperManager.getInstance(getApplicationContext());
            try {
             Bitmap bitmap=((BitmapDrawable)selectedImageView .getDrawable()).getBitmap();
             if(bitmap!=null)
             myWallpaperManager.setBitmap(bitmap);
            } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
            }
            }
        });
            }

or something like below :

gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                    selectedImagePosition = pos;

                    if (selectedImagePosition > 0 && selectedImagePosition < drawables.size() - 1) {

                        leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_enabled));
                        rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_enabled));

                    } else if (selectedImagePosition == 0) {

                        leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_disabled));

                    } else if (selectedImagePosition == drawables.size() - 1) {

                        rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_disabled));
                    }

                    changeBorderForSelectedImage(selectedImagePosition);
                    setSelectedImage(selectedImagePosition);

ImageView imageView = (ImageView) gallery.getSelectedView();

    imageView.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                  WallpaperManager myWallpaperManager
                 = WallpaperManager.getInstance(getApplicationContext());
                try {
                 Bitmap bitmap=((BitmapDrawable)imageView.getDrawable()).getBitmap();
                 if(bitmap!=null)
                 myWallpaperManager.setBitmap(bitmap);
                } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
                }
                }
            });


         }

Make sure you have the below permission in your androidManifest.xml, just put it below and above :

 <uses-permission android:name="android.permission.SET_WALLPAPER" /> 

For dialog to appear and wait for 3 sec to open it:

gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                        selectedImagePosition = pos;

                        if (selectedImagePosition > 0 && selectedImagePosition < drawables.size() - 1) {

                            leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_enabled));
                            rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_enabled));

                        } else if (selectedImagePosition == 0) {

                            leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_disabled));

                        } else if (selectedImagePosition == drawables.size() - 1) {

                            rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_right_disabled));
                        }

                        changeBorderForSelectedImage(selectedImagePosition);
                        setSelectedImage(selectedImagePosition);

    ImageView imageView = (ImageView) gallery.getSelectedView();

        imageView.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                     Handler handler = new Handler();
                 handler.postDelayed(new Runnable(){

                    @Override
                    public void run() {

                        AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(GalleryDemoActivity.this);
                         myAlertDialog.setTitle("Wallpaper");
                         myAlertDialog.setMessage("Want to set as Wallpaper?");
                         myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                          public void onClick(DialogInterface dialog, int arg1) {
                              WallpaperManager myWallpaperManager
                                 = WallpaperManager.getInstance(getApplicationContext());
                                try {
                                 Bitmap bitmap=((BitmapDrawable)imageView.getDrawable()).getBitmap();
                                 if(bitmap!=null)
                                 myWallpaperManager.setBitmap(bitmap);
                                } catch (IOException e) {
                                 // TODO Auto-generated catch block
                                 e.printStackTrace();
                                }
                          }});
                         myAlertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

                          public void onClick(DialogInterface dialog, int arg1) {
                         dialog.dismiss();
                          }});
                         myAlertDialog.create().show(); 
                    }

                 }, 3000);
                    }
                });


             }

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