Android保存截图到系统图库和指定的文件夹

参考 http://blog.youkuaiyun.com/xu_fu/article/details/39158747
中间 MediaStore.Images.Media.insertImage(context.getContentResolver(), appDir.getAbsolutePath(), fileName, null); 出现NullPointException，去掉context即可。

bt_image点击实现是实现图片保存到指定的文件夹，同时又需要图片出现在图库里

本人具体实现如下：

1、添加权限：

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

2、布局是两个button控件，id是 bt_image和bt

3、具体代码实现如下：

public class ViewActivity extends AppCompatActivity implements View.OnClickListener {
    private Button bt,bt_image;
    private Context context;
    Bitmap bitmap,bmp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.screenshot);
        bt = (Button) findViewById(R.id.bt);
        bt_image= (Button) findViewById(R.id.bt_image);
        bt_image.setOnClickListener(this);
        bt.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bt_image:
            //截屏
                View view = v.getRootView();
                view.setDrawingCacheEnabled(true);
                view.buildDrawingCache();
                bmp = view.getDrawingCache();
                // 首先保存图片
                File appDir = new File(Environment.getExternalStorageDirectory(), "Damily");
                if (!appDir.exists()) {
                    appDir.mkdir();
                }
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.US);
                String fileName=sdf.format(new Date())+".jpg";
              //or    String fileName = System.currentTimeMillis() + ".jpg";
                File file = new File(appDir, fileName);
                System.out.println( file.getAbsolutePath().toString());
                System.out.println( appDir.toString());
               if (bmp != null) {
                   try {
                       FileOutputStream fos = new FileOutputStream(file);
                       bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
                       fos.flush();
                       fos.close();
                   } catch (FileNotFoundException e) {
                       e.printStackTrace();
                   } catch (IOException e) {
                       e.printStackTrace();
                   }
               }
                // 其次把文件插入到系统图库
                try {
                    MediaStore.Images.Media.insertImage(getContentResolver(),
                            appDir.getAbsolutePath(), fileName, null);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
                // 最后通知图库更新
               Intent scanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
              //  scanIntent.setData(Uri.fromFile(new File("/sdcard/Damily/"+fileName)));
              scanIntent.setData(Uri.fromFile(new File(Environment.getExternalStorageDirectory() +"/Damily/"+ fileName)));
                sendBroadcast(scanIntent);
                // sendNotification();下一篇博客实现
                break;

                //下面代码是只保存图片到指定文件夹中
          /*  case R.id.bt:
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.US);
                String fpath="/sdcard/"+sdf.format(new Date())+".png";
                View view = v.getRootView();
                view.setDrawingCacheEnabled(true);
                view.buildDrawingCache();
                 bitmap = view.getDrawingCache();
                if (bitmap != null) {
                    System.out.println("got");
                    try {
                        FileOutputStream fos=new FileOutputStream(fpath);
                        bitmap.compress(Bitmap.CompressFormat.PNG,100,fos);
                        fos.flush();
                        fos.close();
                        System.out.println("file---"+fpath+"----output done.");
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }else{
                    System.out.println("bitmap is NULL");
                }
                break;*/
        }
    }
}

运行结果如下：

// sendNotification(); 截图完发送通知，并且点击通知可以查看该截图