android - 相机打开时如何处理按下 "back"按钮

Question

我应该如何处理“后退”按钮和相机按钮的按下？就像，我有一个打开的相机来拍照，但没有拍摄照片，我按下了硬件“后退”按钮。发生这种情况时，我的应用程序会崩溃。

我应该如何处理“后退”按钮的按下？

if (requestCode == 100) {
        if (resultCode == RESULT_OK) {
            if (intent == null) {
                // The picture was taken but not returned
                /*Toast.makeText(
                        getApplicationContext(),
                        "The picture was taken and is located here: "
                                + fileUri.toString(), Toast.LENGTH_LONG)
                        .show();  */              
            } else {
                // The picture was returned
                Bundle extras = intent.getExtras();
                temp_photo = (Bitmap) extras.get("data");
                image1.setImageBitmap(temp_photo);

            }
        }
        else if(resultCode == RESULT_CANCELED)
        {
                if (intent.resolveActivity(getPackageManager()) != null) {
                    startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
                }
                else
                {                 
                    finish();
                }
        }
    }        

Answer 1

您可以使用以下方法告诉应用程序在按下后退按钮时要做什么:

@Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
       if ((keyCode == KeyEvent.KEYCODE_BACK)) {
           onBackPressed();
       }
       return true;
    }
   @Override
    public void onBackPressed() {
        super.onBackPressed();
// Enter your code here

}

希望对你有帮助。