android 保存图片到相册

//点击图片保存
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String[] PERMISSIONS = {
"android.permission.READ_EXTERNAL_STORAGE",
"android.permission.WRITE_EXTERNAL_STORAGE" };
//检测是否有写的权限
int permission = ContextCompat.checkSelfPermission(MainActivity.this,
"android.permission.WRITE_EXTERNAL_STORAGE");
if (permission != PackageManager.PERMISSION_GRANTED) {
// 没有写的权限，去申请写的权限，会弹出对话框
ActivityCompat.requestPermissions(MainActivity.this, PERMISSIONS,1);
}
try {
//创建savephoto类保存图片
SavePhoto savePhoto = new SavePhoto(MainActivity.this);
savePhoto.SaveBitmapFromView(imageView);
} catch (ParseException e) {
e.printStackTrace();
}
}
});

工具类
public class SavePhoto{
//存调用该类的活动
Context context;

public SavePhoto(Context context) {
    this.context = context;
}

//保存文件的方法：
public void SaveBitmapFromView(View view) throws ParseException {
    int w = view.getWidth();
    int h = view.getHeight();
    Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bmp);
    view.layout(0, 0, w, h);
    view.draw(c);
    // 缩小图片
    Matrix matrix = new Matrix();
    matrix.postScale(0.5f,0.5f); //长和宽放大缩小的比例
    bmp = Bitmap.createBitmap(bmp,0,0,bmp.getWidth(),bmp.getHeight(),matrix,true);
    DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
    saveBitmap(bmp,bmp.toString() + ".JPEG");
}

/*
 * 保存文件，文件名为当前日期
 */
public void saveBitmap(Bitmap bitmap, String bitName){
    String fileName ;
    File file ;
    if(Build.BRAND .equals("Xiaomi") ){ // 小米手机
        fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/Camera/"+bitName ;
    }else{  // Meizu 、Oppo
        Log.v("qwe","002");
        fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+bitName ;
    }
    file = new File(fileName);

    if(file.exists()){
        file.delete();
    }
    FileOutputStream out;
    try{
        out = new FileOutputStream(file);
        // 格式为 JPEG，照相机拍出的图片为JPEG格式的，PNG格式的不能显示在相册中
        if(bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out))
        {
            out.flush();
            out.close();
            // 插入图库
            MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), bitName, null);

        }
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();

    }
    // 发送广播，通知刷新图库的显示
    context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + fileName)));

}

}
————————————————
版权声明：本文为CSDN博主「_yuanhao」的原创文章，遵循CC 4.0 by-sa版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_43377749/article/details/84325487