Android开发壁纸的验证设置和确认功能实现demo

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

try {
    WallpaperManager wpm = (WallpaperManager) getActivity().getSystemService(Context.WALLPAPER_SERVICE);
    if (wpm != null) {
        Bitmap mBitmap = BitmapFactory.decodeFile(path); //path为绝对路径
        //第一个参数是Bitmap对象，第二个参数是截取图片的大小矩形，第三个参数是是否备份
        wpm.setBitmap(mBitmap, new Rect(0, 0, right, bottom), true); 
        Log.i("liwenzhi", "wallpaper not null");
    }
} catch (IOException e) {
    Log.e(TAG, "Failed to set wallpaper: "   e);
}

    <uses-permission android:name = "android.permission.SET_WALLPAPER"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    //Android10及以后的版本，需要额外添加的权限
    <uses-permission android:name="android.permission.WRITE_MEDIA_STORAGE"
        tools:ignore="ProtectedPermissions" />

try {
    WallpaperManager wpm = WallpaperManager.getInstance(context);//同getActivity().getSystemService(Context.WALLPAPER_SERVICE);
    wpm.setResource(getResources().getIdentifier(name, "drawable", context.getPackageName()));
} catch (IOException e) {
    Log.e("TAG","error = "   e.getMessage());
}

//root
adb root
//拉到电脑的D盘temp目录下，电脑中看
adb push D:/temp/wallpaper.png /data/system/users/0/wallpaper 
//拉到sdcard根目录，手机应用中看
adb push /sdcard/wallpaper.png /data/system/users/0/wallpaper
//需要重启才能生效
adb root

//显示壁纸图片,需要系统签名
    public void showWallpaper(View view) {
        try {
            Bitmap bitmap = BitmapFactory.decodeFile("/data/system/users/0/wallpaper");
            iv_wallpaper.setImageBitmap(bitmap);
        } catch (Exception e) {
            Log.e(TAG, "showWallpaper error = "   e.getMessage());
            tv_info.append("showWallpaper error = "   e.getMessage());
        }
    }
    //把壁纸pull到sdcard目录,需要系统签名
    public void pullWallpaperToSdcard(View view) {
        Log.i(TAG, "pullWallpaperToSdcard start");
        File fromFile = new File("/data/system/users/0/wallpaper");
        File toFile = new File("/sdcard/"   getTimeString()   "_wallpaper.png");
        copyFile(fromFile, toFile);
        Log.i(TAG, "pullWallpaperToSdcard end");
    }
    //获取当前时间的完整显示字符串
    private String getTimeString() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
        return format.format(new Date(System.currentTimeMillis()));
    }
    //复制文件操作
    private void copyFile(File fromFile, File toFile) {
        try {
            if (!toFile.getParentFile().exists()) {
                toFile.getParentFile().mkdirs();
            }
            java.io.FileInputStream fosfrom = new java.io.FileInputStream(fromFile);
            java.io.FileOutputStream fosto = new FileOutputStream(toFile);
            byte bt[] = new byte[1024];
            int c;
            while ((c = fosfrom.read(bt)) > 0) {
                fosto.write(bt, 0, c); //将内容写到新文件当中
            }
            fosfrom.close();
            fosto.close();
        } catch (Exception e) {
            Log.e(TAG, e.getMessage());
            tv_info.append("copyFile error = "   e.getMessage());
        }
    }

//root权限
adb root
//拉到电脑的D盘temp目录下，电脑中看
adb pull /data/system/users/0/wallpaper D:/temp/wallpaper.png
//拉到sdcard根目录，手机应用中看
adb pull /data/system/users/0/wallpaper D:/temp/wallpaper.png