如何通过编程将图片设置为壁纸？

Question

我一直在开发需要将图片设置为壁纸的应用程序。

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());
    }

同时，我已经添加了以下权限:

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

但是它不起作用；该文件存在于SD卡上。我哪里犯了错误？

- user1166635

---

是否抛出了异常？ - Jason Robinson

Answer 1

如果您的图片太大，可能会导致内存不足。您可以通过阅读Logcat日志来确定。如果是这种情况，请尝试通过以下方式将您的图片调整到设备大小：

    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);
    }

- mbakulin

Answer 2

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();
    }
} 

打开Androidmanifest.xml文件并添加权限，例如...

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

请尝试这个并告诉我发生了什么。

- Balamurugan