Android设置图片为墙纸 [英] Android set image as wallpaper
本文介绍了Android设置图片为墙纸的处理方法，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
请向我展示如何使用 Android WallpaperManager 将图像设置为墙纸的示例代码.我已经缩短并编辑了我的问题.希望你们能理解我的问题.我将展示我所做的一些尝试.
Please show me an example code on how to set image as wallpaper using Android WallpaperManager. I have shortened and edited my question. Hopefully you guys could understand my question. I will show some attempts I have made.
HomeActivity.class
HomeActivity.class
public class HomeActivity extends BaseActivity {
String[] imageUrls;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac_home);
ArrayList<String> url = new ArrayList<String>();
try {
URL url_link = new URL("http://mywebsite.net/web/thumb.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url_link.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("list");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element)node;
NodeList nameList = fstElmnt.getElementsByTagName("thumb_url");
Element nameElement = (Element)nameList.item(0);
nameList = nameElement.getChildNodes();
url.add(nameList.item(0).getNodeValue());
}
imageUrls = (String[]) url.toArray(new String[0]);
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
}
public void onImageGridClick(View view) {
Intent intent = new Intent(this, ImageGridActivity.class);
intent.putExtra(Extra.IMAGES, imageUrls);
startActivity(intent);
}
public void onImagePagerClick(View view) {
Intent intent = new Intent(this, ImagePagerActivity.class);
intent.putExtra(Extra.IMAGES, imageUrls);
startActivity(intent);
}
}
ImagePagerActivity.class
ImagePagerActivity.class
package com.nostra13.example.universalimageloader;
import java.io.IOException;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
public class ImagePagerActivity extends BaseActivity {
private ViewPager pager;
private DisplayImageOptions options;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac_image_pager);
Bundle bundle = getIntent().getExtras();
String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);
options = new DisplayImageOptions.Builder()
.showImageForEmptyUri(R.drawable.image_for_empty_url)
.cacheOnDisc()
.imageScaleType(ImageScaleType.EXACT)
.build();
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new ImagePagerAdapter(imageUrls));
pager.setCurrentItem(pagerPosition);
}
public void setWallpaper() {
WallpaperManager myWallpaperManager
= WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.setResource(R.id.pager); // nothing happened
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.item_clear_memory_cache:
imageLoader.clearMemoryCache();
return true;
case R.id.item_clear_disc_cache:
setWallpaper();
return true;
default:
return false;
}
}
@Override
protected void onStop() {
imageLoader.stop();
super.onStop();
}
private class ImagePagerAdapter extends PagerAdapter {
private String[] images;
private LayoutInflater inflater;
ImagePagerAdapter(String[] images) {
this.images = images;
inflater = getLayoutInflater();
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
@Override
public void finishUpdate(View container) {
}
@Override
public int getCount() {
return images.length;
}
@Override
public Object instantiateItem(View view, int position) {
final View imageLayout = inflater.inflate(R.layout.item_pager_image, null);
final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);
final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);
imageLoader.displayImage(images[position], imageView, options, new ImageLoadingListener() {
public void onLoadingStarted() {
spinner.setVisibility(View.VISIBLE);
}
public void onLoadingFailed(FailReason failReason) {
String message = null;
switch (failReason) {
case IO_ERROR:
message = "Input/Output error";
break;
case OUT_OF_MEMORY:
message = "Out Of Memory error";
break;
case UNKNOWN:
message = "Unknown error";
break;
}
Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();
spinner.setVisibility(View.GONE);
imageView.setImageResource(android.R.drawable.ic_delete);
}
public void onLoadingComplete(Bitmap loadedImage) {
spinner.setVisibility(View.GONE);
Animation anim = AnimationUtils.loadAnimation(ImagePagerActivity.this, R.anim.fade_in);
imageView.setAnimation(anim);
anim.start();
}
public void onLoadingCancelled() {
// Do nothing
}
});
((ViewPager) view).addView(imageLayout, 0);
return imageLayout;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
@Override
public void restoreState(Parcelable state, ClassLoader loader) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View container) {
}
}
}
第一次尝试(我的 pagerPosition 出现错误pagerPosition 无法解析为变量")
1st Attempt (My pagerPosition is giving error "pagerPosition cannot be resolved to a variable")
public void setWallpaper(){
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), pagerPosition);
try {
ImagePagerActivity.this.setWallpaper(bitmap);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("Gallery Example", "Image setted.");
}
第二次尝试(我的 pagerPosition 出现错误pagerPosition 无法解析为变量")
2nd Attempt (My pagerPosition is giving error "pagerPosition cannot be resolved to a variable")
public void setWallpaper() {
try {
File file = new File("/sdcard/sampleimage");
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), pagerPosition);
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();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.set_wallpaper:
setWallpaper();
return true;
default:
return false;
}
}
第三次尝试(我的 setResource(R.id.pager) 没有从 viewpager 获取图像.
3rd Attempt (My setResource(R.id.pager) is not getting the image from the viewpager.
public void setWallpaper() {
WallpaperManager myWallpaperManager
= WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.setResource(R.id.pager);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
结论
如果我将以下代码放在 onCreate 上方，我的整个项目将无法运行.
If i put the below codes above my onCreate my whole project will not run.
Bundle bundle = getIntent().getExtras();
String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
final int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);
推荐答案
在 ImagePagerActivity 中尝试下面的代码，我测试了下面的代码，它正在工作.
Try below code in ImagePagerActivity, i tested below code and it is working.
// fetch bitmap from view
public static Bitmap getBitmapFromView(View view) {
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view
.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
bgDrawable.draw(canvas);
else
// if we unable to get background drawable then we will set white color as wallpaper
canvas.drawColor(Color.WHITE);
view.draw(canvas);
return returnedBitmap;
}
public void setWall(int i) {
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
try {
// below line of code will set your current visible pager item to wallpaper
// first we have to fetch bitmap from visible view and then we can pass it to wallpaper
myWallpaperManager.setBitmap(getBitmapFromView(pager.getChildAt(1)));
// below line of code will set input stream data directly to wallpaper
// myWallpaperManager.setStream(InputStream Data);
// below line of code will set any image which is in the drawable folder
// myWallpaperManager.setResource(R.drawable.icon);
} catch (IOException e) {
e.printStackTrace();
}
}
它将设置当前可见分页器的项目视图(如果是进度轮或图像).
It will set current visible pager's item view(if it is progress wheel or image).
这篇关于Android设置图片为墙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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