安卓入门：设置壁纸 [英] Android Beginner: Setting Wallpaper
本文介绍了安卓入门：设置壁纸的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是初学者所以请大家多多包涵。我创建了一个应用程序，让您可以滚动壁纸的选择，选择一个。一切完美，但是Android只设置左下角为墙纸...墙纸尺寸为640×960。
这是我的code：
进口java.io.IOException异常;
进口的java.io.InputStream;
进口android.app.Activity;
进口android.app.AlertDialog;
进口android.content.DialogInterface;
进口android.content.Intent;
进口android.graphics.Bitmap;
进口android.graphics.BitmapFactory;
进口android.net.Uri;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口android.widget.HorizontalScrollView;
进口android.widget.ImageView;
进口android.widget.LinearLayout;
公共类壁纸延伸活动实现OnClickListener {
按钮preVIEW;
按钮的setBackground;
按钮returnBack;
ImageView的显示;
ImageView的wallpaper1;
ImageView的wallpaper2;
ImageView的wallpaper3;
ImageView的wallpaper4;
的LinearLayout背景preVIEW;
私人诠释图像= R.drawable.wallpaper1;
HorizontalScrollView滚动视图;
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.wallpapers）;
preVIEW =（按钮）findViewById（R.id.wallpaper preVIEW）;
的setBackground =（按钮）findViewById（R.id.wallpaperSet）;
returnBack =（按钮）findViewById（R.id.wallpaperReturn）;
preview.setOnClickListener（本）;
setBackground.setOnClickListener（本）;
returnBack.setOnClickListener（本）;
显示器=（ImageView的）findViewById（R.id.wallpaperDisplay）;
wallpaper1 =（ImageView的）findViewById（R.id.wallpaper1）;
wallpaper2 =（ImageView的）findViewById（R.id.wallpaper2）;
wallpaper3 =（ImageView的）findViewById（R.id.wallpaper3）;
wallpaper4 =（ImageView的）findViewById（R.id.wallpaper4）;
wallpaper1.setOnClickListener（本）;
wallpaper2.setOnClickListener（本）;
wallpaper3.setOnClickListener（本）;
wallpaper4.setOnClickListener（本）;
背景preVIEW =（的LinearLayout）findViewById（R.id.wallpaperActivityLayout）;
滚动视图=（HorizontalScrollView）findViewById（R.id.horizontalScrollView）;
}
公共无效的onClick（视图v）{
开关（v.getId（））{
案例R.id.wallpaper preVIEW：
previewBackground（图像）;
打破;
案例R.id.wallpaperSet：
新AlertDialog.Builder（本）
.setMessage（你想设置此图片作为壁纸？）
.setPositiveButton（是，新DialogInterface.OnClickListener（）{
公共无效的onClick（DialogInterface对话，诠释它）{
InputStream的是= getResources（）openRawResource（图像）。
位图墙纸= BitmapFactory.de codeStream（是）;
尝试{
getApplicationContext（）setWallpaper（墙纸）。
}赶上（IOException异常E）{
e.printStackTrace（）;
}
}
}）
.setNegativeButton（否，空）
。显示（）;
打破;
案例R.id.wallpaperReturn：
相反（）;
打破;
案例R.id.wallpaper1：
display.setImageResource（R.drawable.wallpaper1）;
图像= R.drawable.wallpaper1;
打破;
案例R.id.wallpaper2：
display.setImageResource（R.drawable.wallpaper2）;
图像= R.drawable.wallpaper2;
打破;
案例R.id.wallpaper3：
display.setImageResource（R.drawable.wallpaper3）;
图像= R.drawable.wallpaper3;
打破;
案例R.id.wallpaper4：
display.setImageResource（R.drawable.wallpaper4）;
图像= R.drawable.wallpaper4;
打破;
}
}
私人无效previewBackground（INT图像）{
背景preview.setBackgroundResource（图像）;
setBackground.setVisibility（View.GONE）;
preview.setVisibility（View.GONE）;
display.setVisibility（View.GONE）;
scrollView.setVisibility（View.GONE）;
returnBack.setVisibility（View.VISIBLE）;
}
私人无效反向（）{
背景preview.setBackgroundResource（android.R.color.black）;
setBackground.setVisibility（View.VISIBLE）;
preview.setVisibility（View.VISIBLE）;
display.setVisibility（View.VISIBLE）;
scrollView.setVisibility（View.VISIBLE）;
returnBack.setVisibility（View.GONE）;
}
}
解决方案
公共无效的setBackground（INT URL）{
尝试 {
档案文件=新的文件（/ SD卡/ sampleimage）;
点阵位图= BitmapFactory.de codeResource（getResources（），URL）;
bitmap.com preSS（比较pressFormat.JPEG，80，新的FileOutputStream（文件））;
上下文的背景下= this.getBaseContext（）;
context.setWallpaper（位）;
Toast.makeText（getApplicationContext（），墙纸已设置，Toast.LENGTH_SHORT）.show（）;
}赶上（MalformedURLException异常E）{
e.printStackTrace（）;
}赶上（IOException异常E）{
e.printStackTrace（）;
}
}
在AndroidManifest.xml中
＆LT;使用-权限的Android：名称=android.permission.SET_WALLPAPER＆GT;＆LT; /使用-许可＆GT;
I am a beginner so please bear with me. I created an app that allows you to scroll through a choice of wallpapers and select one. Everything works perfectly, but android only sets the bottom left corner as the wallpaper... the wallpaper dimensions are 640 x 960.
here is my code:
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class Wallpapers extends Activity implements OnClickListener{
Button preview;
Button setBackground;
Button returnBack;
ImageView display;
ImageView wallpaper1;
ImageView wallpaper2;
ImageView wallpaper3;
ImageView wallpaper4;
LinearLayout backgroundPreview;
private int image = R.drawable.wallpaper1;
HorizontalScrollView scrollView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wallpapers);
preview= (Button)findViewById(R.id.wallpaperPreview);
setBackground = (Button)findViewById(R.id.wallpaperSet);
returnBack = (Button)findViewById(R.id.wallpaperReturn);
preview.setOnClickListener(this);
setBackground.setOnClickListener(this);
returnBack.setOnClickListener(this);
display=(ImageView)findViewById(R.id.wallpaperDisplay);
wallpaper1=(ImageView)findViewById(R.id.wallpaper1);
wallpaper2=(ImageView)findViewById(R.id.wallpaper2);
wallpaper3=(ImageView)findViewById(R.id.wallpaper3);
wallpaper4=(ImageView)findViewById(R.id.wallpaper4);
wallpaper1.setOnClickListener(this);
wallpaper2.setOnClickListener(this);
wallpaper3.setOnClickListener(this);
wallpaper4.setOnClickListener(this);
backgroundPreview = (LinearLayout)findViewById(R.id.wallpaperActivityLayout);
scrollView = (HorizontalScrollView)findViewById(R.id.horizontalScrollView);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.wallpaperPreview:
previewBackground(image);
break;
case R.id.wallpaperSet:
new AlertDialog.Builder(this)
.setMessage("Would you like to set this image as your wallpaper?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
InputStream is = getResources().openRawResource(image);
Bitmap wallpaper = BitmapFactory.decodeStream(is);
try{
getApplicationContext().setWallpaper(wallpaper);
}catch(IOException e){
e.printStackTrace();
}
}
})
.setNegativeButton("No", null)
.show();
break;
case R.id.wallpaperReturn:
reverse();
break;
case R.id.wallpaper1:
display.setImageResource(R.drawable.wallpaper1);
image = R.drawable.wallpaper1;
break;
case R.id.wallpaper2:
display.setImageResource(R.drawable.wallpaper2);
image = R.drawable.wallpaper2;
break;
case R.id.wallpaper3:
display.setImageResource(R.drawable.wallpaper3);
image = R.drawable.wallpaper3;
break;
case R.id.wallpaper4:
display.setImageResource(R.drawable.wallpaper4);
image = R.drawable.wallpaper4;
break;
}
}
private void previewBackground(int image) {
backgroundPreview.setBackgroundResource(image);
setBackground.setVisibility(View.GONE);
preview.setVisibility(View.GONE);
display.setVisibility(View.GONE);
scrollView.setVisibility(View.GONE);
returnBack.setVisibility(View.VISIBLE);
}
private void reverse() {
backgroundPreview.setBackgroundResource(android.R.color.black);
setBackground.setVisibility(View.VISIBLE);
preview.setVisibility(View.VISIBLE);
display.setVisibility(View.VISIBLE);
scrollView.setVisibility(View.VISIBLE);
returnBack.setVisibility(View.GONE);
}
}
解决方案
public void SetBackground(int Url) {
try {
File file = new File("/sdcard/sampleimage");
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), Url);
bitmap.compress(CompressFormat.JPEG, 80, new FileOutputStream(file));
Context context = this.getBaseContext();
context.setWallpaper(bitmap);
Toast.makeText(getApplicationContext(), "Wallpaper has been set", Toast.LENGTH_SHORT).show();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
in AndroidManifest.xml
<uses-permission android:name="android.permission.SET_WALLPAPER"></uses-permission>
这篇关于安卓入门：设置壁纸的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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