在OnClick之前調用了OnActivityResult

Question

我試圖創建一個意圖來打開圖庫（效果很好）。

但是，我需要更改圖像按鈕以顯示用戶選擇的圖片的圖像。

問題在於，在galleryIntent（）方法之前調用了onActivityResult（）方法，這導致結果代碼不是RESULT_OK，因此，當選擇圖片時，用戶將重定向到應用程序，並且什么也沒有發生。

public class DataEntryActivity extends AppCompatActivity {

ImageButton imgButton;
Bitmap bmp;
private static final int PICTURE_SELECTED = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(com.example.bernine.practicalsessions.R.layout.activity_portal);
    imgButton = (ImageButton) findViewById(com.example.bernine.practicalsessions.R.id.imageButton1);
}

//Method to start the intent upon clicking the imageButton
public void galleryIntent(View view) {
    Intent intent = new Intent();
    intent.setAction(android.content.Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivityForResult(intent, PICTURE_SELECTED);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Toast.makeText(getApplicationContext(), "Image Opened Before", Toast.LENGTH_LONG).show();
    if (resultCode == RESULT_OK) {
        try {
            InputStream stream = getContentResolver().openInputStream(data.getData());
            bmp = BitmapFactory.decodeStream(stream);
            stream.close();
            Toast.makeText(getApplicationContext(), "Image Opened", Toast.LENGTH_LONG).show();
            imgButton.setImageBitmap(bmp);
        }catch(Exception e)
        {
            Toast.makeText(getApplicationContext(), "Could not open file.", Toast.LENGTH_LONG).show();

        }
    }else
    {
        Toast.makeText(getApplicationContext(), "Result not ok", Toast.LENGTH_LONG).show();
    }
    super.onActivityResult(requestCode, resultCode, data);
}
}

我嘗試在清單中的活動中執行android：launchMode =“ standard”，但沒有用。

Answer 1

您不必啟動新的圖片選擇任務-

public void galleryIntent(View view) {
    Intent intent = new Intent();
    intent.setAction(android.content.Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");

    **//Remove this line** 
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

    startActivityForResult(intent, PICTURE_SELECTED);
}