如何将多个图像发送到android中的另一个活动？

Posted 2023-04-17

【中文标题】如何将多个图像发送到android中的另一个活动？

【英文标题】：How to send multiple images to another activity in android?

【发布时间】：2014-07-07 06:56:22

【问题描述】：

在我的应用程序中，我创建了一个自定义相机，它可以捕获图像并将其保存在 SD 卡中。也可以在第二个活动中查看。但它只是替换了我不想要的以前的图像。如何将多张图片发送到第二个活动？

 @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.surfaceview);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        getWindow().setFormat(PixelFormat.UNKNOWN);
        surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        controlInflater = LayoutInflater.from(getBaseContext());
        View viewControl = controlInflater.inflate(R.layout.custom, null);
        LayoutParams layoutParamsControl = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        this.addContentView(viewControl, layoutParamsControl);
        click = (Button) findViewById(R.id.button_capture);
        click.setOnClickListener(new OnClickListener()

             public void onClick(View arg0) 
                   // TODO Auto-generated method stub

                   camera.takePicture(myShutterCallback,
                     myPictureCallback_RAW, myPictureCallback_JPG);
                  );
                  

                  ShutterCallback myShutterCallback = new ShutterCallback()

                 @Override
                 public void onShutter() 
                  // TODO Auto-generated method stub

                 ;

                PictureCallback myPictureCallback_RAW = new PictureCallback()

                 @Override
                 public void onPictureTaken(byte[] arg0, Camera arg1) 
                  // TODO Auto-generated method stub

                 ;

                PictureCallback myPictureCallback_JPG = new PictureCallback()

                 @Override
                 public void onPictureTaken(byte[] arg0, Camera arg1) 
                  // TODO Auto-generated method stub
                  Bitmap bitmapPicture = BitmapFactory.decodeByteArray(arg0, 0, arg0.length);


                  filepath = Environment.getExternalStorageDirectory()+"/testing/"+"test.3gp";
                    System.out.println("thumbnail path~~~~~~"+filepath);
                    File file = new File(filepath);
                    Uri uriTarget = Uri.fromFile(file);

                  OutputStream imageFileOS;
                  try 
                   imageFileOS = getContentResolver().openOutputStream(uriTarget);
                   imageFileOS.write(arg0);
                   imageFileOS.flush();
                   imageFileOS.close();
                   Toast.makeText(CustomCameraActivity.this, "Image saved: " + uriTarget.toString(), Toast.LENGTH_LONG).show();
                   Intent returnIntent = new Intent();
                   returnIntent.putExtra("result",filepath.toString());
                   setResult(1,returnIntent);     
                   finish();
                   catch (FileNotFoundException e) 

                   // TODO Auto-generated catch block

                   e.printStackTrace();

                   catch (IOException e) 

                   // TODO Auto-generated catch block

                   e.printStackTrace();

                  
                 // camera.startPreview();

                 ;

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) 
        if(previewing)
            camera.stopPreview();
            previewing = false;
        

        if (camera != null)
            try 
                camera.setPreviewDisplay(surfaceHolder);
                camera.startPreview();
                previewing = true;
             catch (IOException e) 
                e.printStackTrace();
            
        
    

    @Override
    public void surfaceCreated(SurfaceHolder holder) 
        camera = Camera.open();
    

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) 
        camera.stopPreview();
        camera.release();
        camera = null;
        previewing = false;
    

【问题讨论】：

将此路径存储在 List 中并将此 List 传递给另一个 Activity 并尝试从 List 加载所有图像。

您提到您将图像保存在 SD 卡中。所以你必须有他们的路径。您可以从 sd-card 中选择这些图像。

我只得到一张图片

输入您的代码以从自定义相机获取图像。

我已经更新了我的自定义相机代码

【参考方案1】：

只需将您的图像转换为位图，然后通过yourIntent.putExra("key",bitmap); 将Bitmap 传递到另一个活动中

或者使用这个：

 private File imageFile;
 private Uri imageUri;
 private static final int CAMERA_REQUEST_CODE = 100;
 private String imagePath
 private Uri getTempUri() 
        // Create an image file name
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
        String dt = sdf.format(new Date());
        imageFile = null;
        imageFile = new File(Environment.getExternalStorageDirectory()
                + "/foldername/", "Camera_" + dt + ".jpg");
        Applog.Log(
                TAG,
                "New Camera Image Path:- "
                        + Environment.getExternalStorageDirectory()
                        + "/foldername/" + "Camera_" + dt + ".jpg");
        File file = new File(Environment.getExternalStorageDirectory()
                + "/foldername");
        if (!file.exists()) 
            file.mkdir();
        
        if (!imageFile.exists()) 
            try 
                imageFile.createNewFile();
             catch (IOException e) 
                e.printStackTrace();
            
        
        imagePath = Environment.getExternalStorageDirectory() + "/foldername/"
                + "Camera_" + dt + ".jpg";
        imageUri = Uri.fromFile(imageFile);
        return imageUri;
    

现在当你开始为相机活动时。

    Intent cameraIntent = new Intent(
                                        android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

                                cameraIntent.putExtra(
                                        MediaStore.EXTRA_OUTPUT,
                                        getTempUri());
                                startActivityForResult(cameraIntent,
                                        CAMERA_REQUEST_CODE);

现在在 ActivityResult 中：

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
        if (CAMERA_REQUEST_CODE == requestCode && resultCode == RESULT_OK) 

        String yourUri=ImagePath;
            //now store this Uri it will contain capture image url.
        

【讨论】：

而不是传递 Bitmap 尝试传递 imageuri。

但他/她没有指定要传递 imageUri。

我猜，如果你传递位图，内存会增加。而是通过 ImageUri。