Question

我正在尝试创建一个打开Gallery的意图（工作正常）。

但是，我需要更改图像按钮以显示用户选择的图像。

问题是在galleryIntent（）方法之前调用了onActivityResult（）方法，导致结果代码不是RESULT_OK，因此当选择图片时，用户被重定向到应用程序并且没有任何反应。

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);
}
}

我尝试做android：launchMode =＆＃34;标准＆＃34;在清单中的活动但没有奏效。

Answer 1

您不必为图片选择开始新任务 -

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);
}

在OnClick之前调用OnActivityResult

1 个答案: