android - 双存图

Question

我使用过手册 http://developer.android.com/guide/topics/media/camera.html 但我有问题。此代码保存图像两次。第一张图片保存在/sdcard/DCIM/Camera 中，第二张图片保存在/sdcard/PicturesMyCameraApp 中。我怎样才能删除第一次保存到/sdcard/DCIM/Camera. 感谢帮助

public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
        case R.id.imageButton1:
            Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            i.putExtra(MediaStore.EXTRA_OUTPUT, getOutputMediaFileUri());
            startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
        break;
    }
}
@Override
public boolean onCreateOptionsMenu(Menu menu){
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.mainmenu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item){
    switch (item.getItemId()) {
        case R.id.item1:
            /*Intent intent = new Intent(ZodiacActivity.this, AboutActivity.class);
            startActivity(intent);*/
        break;
        case R.id.item2:
            this.moveTaskToBack(true);
        break;
    }
    return true;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);  

    if (requestCode==CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
        if (resultCode==RESULT_OK) {
            Toast.makeText(this, "Uloženo do: " + getOutputMediaFileUri().toString(), Toast.LENGTH_LONG).show();
        }
        else {
            return;
        }
    }
}

public Uri getOutputMediaFileUri(){
      return Uri.fromFile(getOutputMediaFile());
}

public File getOutputMediaFile(){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");

    return mediaFile;
}

Answer 1

您可以简单地删除文件:

String pathToFile = "/sdcard/DCIM/Camera/imagename.jpg";
boolean success = new File(pathToFile).delete();

if(success){
// deleting file succeeded
}else{
// it didn't succeed
}

编辑

在/sdcard/DCIM/Camera中获取最新拍摄的照片:

File[] images = new File("/sdcard/DCIM/Camera").listFiles();
File latestSavedImage = images[0];
for(int i=1; i<images.length; ++i){
 if(images[i].lastModified() > latestSavedImage.lastModified()){
   latestSavedImage = image;
 }
}

请注意，代码未经测试!