我也找不到示例。我注意到的第一件事是EXTRA_LIVE_WALLPAPER_COMPONENT 不需要字符串,而是ComponentName。我与ComponentName 的第一次剪辑是这样的:
ComponentName component = new ComponentName(getPackageName(), "LiveWallpaperService");
intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT, component);
startActivityForResult(intent, REQUEST_SET_LIVE_WALLPAPER);
那没切,于是我挖了Android源代码,在LiveWallpaperChange.java找到如下:
Intent queryIntent = new Intent(WallpaperService.SERVICE_INTERFACE);
queryIntent.setPackage(comp.getPackageName());
List<ResolveInfo> list = getPackageManager().queryIntentServices( queryIntent, PackageManager.GET_META_DATA);
对上面的块进行一点调试,这是我的最终形式......
ComponentName component = new ComponentName(getPackageName(), getPackageName() + ".LiveWallpaperService");
intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT, component);
startActivityForResult(intent, REQUEST_SET_LIVE_WALLPAPER);
密钥在ComponentName的第二个参数中。
从技术上讲,我的最终表单首先支持新方法的层次结构,然后是旧方法,然后是 Nook Tablet/Nook Color 特定意图:
Intent intent;
// try the new Jelly Bean direct android wallpaper chooser first
try {
ComponentName component = new ComponentName(getPackageName(), getPackageName() + ".LiveWallpaperService");
intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT, component);
startActivityForResult(intent, REQUEST_SET_LIVE_WALLPAPER);
}
catch (android.content.ActivityNotFoundException e3) {
// try the generic android wallpaper chooser next
try {
intent = new Intent(WallpaperManager.ACTION_LIVE_WALLPAPER_CHOOSER);
startActivityForResult(intent, REQUEST_SET_LIVE_WALLPAPER);
}
catch (android.content.ActivityNotFoundException e2) {
// that failed, let's try the nook intent
try {
intent = new Intent();
intent.setAction("com.bn.nook.CHANGE_WALLPAPER");
startActivity(intent);
}
catch (android.content.ActivityNotFoundException e) {
// everything failed, let's notify the user
showDialog(DIALOG_NO_WALLPAPER_PICKER);
}
}
}