android studio活动返回类型问题

Question

在profileActivity.java中有以下代码：

public class ProfileActivity extends AppCompatActivity {
ImageView imageView;
private static final int PICK_IMAGE = 100;
Uri imageUri;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profile);

    final ImageView exampleImage = (ImageView) this.findViewById(R.id.exampleImageView);
    exampleImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // [TODO] Implement application behavior when the user clicks the profile picture
            //Toast.makeText(ProfileActivity.this, "Button Clicked", Toast.LENGTH_SHORT).show();
            GalleryActivity();
        }
    });
}
/*private void GalleryActivity(){
    Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
    startActivityForResult(gallery, PICK_IMAGE);
}
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == RESULT_OK && requestCode == PICK_IMAGE) {
        imageUri = data.getData();
        imageView.setImageURI(imageUri);
    }

}

…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….........................................................................................................我在GalleryActivity.java中有另一段代码

import android.content.Intent;
import android.net.Uri;
import android.provider.MediaStore;
import android.widget.ImageView;

import androidx.appcompat.app.AppCompatActivity;

public class GalleryActivity extends AppCompatActivity {
    ImageView imageView;
    private static final int PICK_IMAGE = 100;
    Uri imageUri;

    Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
    startActivityForResult(gallery, PICK_IMAGE);

}

我试着运行应用程序，它显示

"error: invalid method declaration; return type required startActivityForResult(gallery, 
PICK_IMAGE);

我怎么解决？

Answer 1

您的GalleryActivity类没有方法。由于系统认为您正在尝试创建方法声明而导致错误StartActivityForResult(gallery，PICK_IMAGE)；

这行代码StartActivityForResult(gallery，PICK_IMAGE)；必须位于名为它的方法中，而不能只是在类中浮动。

public class GalleryActivity extends AppCompatActivity {
    ImageView imageView;
    private static final int PICK_IMAGE = 100;
    Uri imageUri;

    Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
    startActivityForResult(gallery, PICK_IMAGE);

}

也许应该是

public class GalleryActivity extends AppCompatActivity {
    ImageView imageView;
    private static final int PICK_IMAGE = 100;
    Uri imageUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
        startActivityForResult(gallery, PICK_IMAGE);
    }

}

或者您希望运行此代码的任何方法。