设置为墙纸意向对话框?

请尝试以下代码段:

Intent intent = new Intent(Intent.ACTION_ATTACH_DATA);
intent.addCategory(Intent.CATEGORY_DEFAULT);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//add this if your targetVersion is more than Android 7.0+
intent.setDataAndType(uri, "image/jpeg");
intent.putExtra("mimeType", "image/jpeg");
this.startActivity(Intent.createChooser(intent, "Set as:"));

PS:uri应该从Android 7.0+中的FileProvider获取,如果您的targetVersion超过7.0+

private void startWallpaper(){
    final Intent pickWallpaper = new Intent(Intent.ACTION_SET_WALLPAPER);
    Intent chooser = Intent.createChooser(pickWallpaper,"set wallpaeper");
    startActivity(chooser);
}

here

在清单文件中:

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

如果您想传递自己的img,可以如下操作:

WallpaperManager wpm = WallpaperManager.getInstance(context);
InputStream ins = new URL("absolute/path/of/image").openStream();
wpm.setStream(ins);