我写了一个简单的应用程序来设置设备上的壁纸。我无法达到一个效果。我希望图片自动水平对中。这意味着图像的中心位于Luncher应用程序的最中央桌面上。 底部的图片显示了它现在的样子:
我想要实现的效果:
图像本身:
我尝试使用this question中的代码,但是没有达到预期的效果。
我的代码:
public class SystemWallpaperHelper {
private Context context;
private ImageLoader imageLoader;
private DisplayImageOptions imageLoaderOptions;
public SystemWallpaperHelper(Context context){
this.context = context;
setImageLoaderOptions();
}
private void setImageLoaderOptions() {
final int width = SharedHelper.getDeviceWidth(context) << 1 ; // best wallpaper width is twice screen width
imageLoaderOptions = new DisplayImageOptions.Builder()
.imageScaleType(ImageScaleType.NONE)
.cacheInMemory(false)
.cacheOnDisk(false)
.postProcessor(new BitmapProcessor() {
@Override
public Bitmap process(Bitmap bmp) {
float scale = (float) width / bmp.getWidth() ;
int height = (int) (scale * bmp.getHeight());
return Bitmap.createScaledBitmap(bmp, width, height, false);
}
})
.build();
imageLoader = ImageLoader.getInstance();
}
public void setDeviceWallpaper(Wallpaper wallpaper){
imageLoader.loadImage(wallpaper.getSrcUrl(), imageLoaderOptions, new SimpleImageLoadingListener(){
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage)
{
WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
try {
wallpaperManager.setBitmap(loadedImage);
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
答案 0 :(得分:2)
经过多次尝试,我设法达到了预期的效果。
public class SystemWallpaperHelper {
private Context context;
private ImageLoader imageLoader;
private DisplayImageOptions imageLoaderOptions;
private WallpaperManager wallpaperManager;
public SystemWallpaperHelper(Context context) {
this.context = context;
setImageLoaderOptions();
wallpaperManager = WallpaperManager.getInstance(context);
}
private void setImageLoaderOptions() {
imageLoaderOptions = new DisplayImageOptions.Builder()
.imageScaleType(ImageScaleType.NONE)
.cacheInMemory(false)
.cacheOnDisk(false)
.postProcessor(new BitmapProcessor() {
@Override
public Bitmap process(Bitmap bmp) {
return centerCropWallpaper(bmp, wallpaperManager.getDesiredMinimumWidth(), wallpaperManager.getDesiredMinimumHeight());
}
})
.build();
imageLoader = ImageLoader.getInstance();
}
private Bitmap centerCropWallpaper(Bitmap wallpaper, int desiredWidth, int desiredHeight){
float scale = (float) desiredHeight / wallpaper.getHeight();
int scaledWidth = (int) (scale * wallpaper.getWidth());
int deviceWidth = SharedHelper.getDeviceWidth(context);
int imageCenterWidth = scaledWidth /2;
int widthToCut = imageCenterWidth - deviceWidth / 2;
int leftWidth = scaledWidth - widthToCut;
Bitmap scaledWallpaper = Bitmap.createScaledBitmap(wallpaper, scaledWidth, desiredHeight, false);
Bitmap croppedWallpaper = Bitmap.createBitmap(
scaledWallpaper,
widthToCut,
0,
leftWidth,
desiredHeight
);
return croppedWallpaper;
}
public void setDeviceWallpaper(final Wallpaper wallpaper, final boolean adjusted) {
imageLoader.loadImage(wallpaper.getSrcUrl(), imageLoaderOptions, new SimpleImageLoadingListener() {
@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (adjusted) {
wallpaperManager.getCropAndSetWallpaperIntent(SharedHelper.getImageUriForBitmap(context, loadedImage));
} else {
try {
int width = wallpaperManager.getDesiredMinimumWidth();
int height = wallpaperManager.getDesiredMinimumHeight();
int bitWidth = loadedImage.getWidth();
wallpaperManager.setBitmap(loadedImage);
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
}
}
答案 1 :(得分:0)
这是一个更通用的版本,可以粘贴在任何java android类中。另外,它不依赖于显示方向。
public static void setWallpaper(Context context, BitmapDrawable wallpaper) {
try {
WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
if(wallpaper != null) {
Bitmap bmp = wallpaper.getBitmap();
DisplayMetrics metrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
Bitmap bitmap = centerCropWallpaper(context, bmp, Math.min(wallpaperManager.getDesiredMinimumWidth(), wallpaperManager.getDesiredMinimumHeight()));
wallpaperManager.setBitmap(bitmap);
} else {
Log.e(TAG, "wallpaper could not be set.");
}
} catch (Exception ex) {
Log.e(TAG, "error setting wallpaper. " + ex.getMessage(), ex);
}
}
private static Bitmap centerCropWallpaper(Context context, Bitmap wallpaper, int desiredHeight){
float scale = (float) desiredHeight / wallpaper.getHeight();
int scaledWidth = (int) (scale * wallpaper.getWidth());
DisplayMetrics metrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(metrics);
int deviceWidth = metrics.widthPixels;
int imageCenterWidth = scaledWidth /2;
int widthToCut = imageCenterWidth - deviceWidth / 2;
int leftWidth = scaledWidth - widthToCut;
Bitmap scaledWallpaper = Bitmap.createScaledBitmap(wallpaper, scaledWidth, desiredHeight, false);
return Bitmap.createBitmap(scaledWallpaper, widthToCut, 0, leftWidth, desiredHeight);
}