Android开发实现的保存图片到相册功能示例

//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();
    }
  }
});

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)));
  }
}