java 如何以编程方式将图像设置为墙纸？
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How to set image as wallpaper programmatically?
提问by user1166635
I have been developing the application which need to set an image as wallpaper.
我一直在开发需要将图像设置为墙纸的应用程序。
Code:
代码：
WallpaperManager m=WallpaperManager.getInstance(this);
String s=Environment.getExternalStorageDirectory().getAbsolutePath()+"/1.jpg";
File f=new File(s);
Log.e("exist", String.valueOf(f.exists()));
try {
InputStream is=new BufferedInputStream(new FileInputStream(s));
m.setBitmap(BitmapFactory.decodeFile(s));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("File", e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("IO", e.getMessage());
}
Also I have added the following permission:
我还添加了以下权限：
<uses-permission android:name="android.permission.SET_WALLPAPER" />
But it doesn't works; the file exists on sdcard. Where have I made a mistake?
但它不起作用；该文件存在于 SD 卡上。我哪里做错了？
回答by mbakulin
Possibly, you run out of memory if your image is big. You can make sure of it by reading Logcat logs. If this is the case, try to adjust your picture to device size by somewhat like this:
如果图像很大，可能会耗尽内存。您可以通过阅读 Logcat 日志来确保这一点。如果是这种情况，请尝试将图片调整为设备大小，如下所示：
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels << 1; // best wallpaper width is twice screen width
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, width, height);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap decodedSampleBitmap = BitmapFactory.decodeFile(path, options);
WallpaperManager wm = WallpaperManager.getInstance(this);
try {
wm.setBitmap(decodedSampleBitmap);
} catch (IOException e) {
Log.e(TAG, "Cannot set image as wallpaper", e);
}
回答by Balamurugan
File f = new File(Environment.getExternalStorageDirectory(), "1.jpg");
String path = f.getAbsolutePath();
File f1 = new File(path);
if(f1.exists()) {
Bitmap bmp = BitmapFactory.decodeFile(path);
BitmapDrawable bitmapDrawable = new BitmapDrawable(bmp);
WallpaperManager m=WallpaperManager.getInstance(this);
try {
m.setBitmap(bmp);
} catch (IOException e) {
e.printStackTrace();
}
}
Open Androidmanifest.xml file and add permission like..
打开 Androidmanifest.xml 文件并添加权限，如..
<uses-permission android:name="android.permission.SET_WALLPAPER" />
Try this and let me know what happen..
试试这个，让我知道会发生什么..
