java - 未定义类型 new View.OnClickListener(){}

Question

当我将项目用作 public class HomeActivity extends Activity implements OnClickListener 并在其中使用 getContentResolver 时，它向我显示错误

未为类型 new View.OnClickListener() 定义方法 getContentResolver(){}

但是当我使用 public class HomeActivity extends ActionBarActivity 时，它对我有用，但是我如何在 public class HomeActivity extends Activity implements OnClickListener 中处理它

代码:

public class HomeActivity extends Activity implements OnClickListener  {
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        btnEdit = (Button) findViewById(R.id.btn_edit);
        btnEdit.setOnClickListener(this);

        btnGallery = (Button) findViewById(R.id.btn_gallery);
        btnGallery.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        Intent intent;
        switch (view.getId()) {
        case R.id.btn_edit:
            intent = new Intent();
            intent.setType("image/*");

            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(intent, REQUEST_IMAGE);
    //      startActivityForResult(
    //              Intent.createChooser(intent, "Select Photo"),
    //              MyConstants.TAKE_PHOTO);
            break;  
        }
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (resultCode != Activity.RESULT_OK) {return;}

            if (requestCode == REQUEST_IMAGE) {
                final Uri uri = data.getData();
                    Button button= (Button) findViewById(R.id.btn_camera);
                    button.setOnClickListener(new OnClickListener() {
                          @Override
                          public void onClick(View v)  {  
                              try
                                {
                                InputStream is = this.getContentResolver().openInputStream(uri);
                                final Bitmap bmInImg = BitmapFactory.decodeStream(is);

                                }
                                catch (IOException e) {
                                    e.printStackTrace(); 
                                }

                          }
                        });

                }
            }

Answer 1

推理:

---

Because getContentResolver() is the method of the Context Class, not the method of View.OnClickListener Interface.

当你写这行的时候

InputStream is = this.getContentResolver().openInputStream(uri);

您正在使用 this 从 View.OnClickListener 接口(interface)调用方法，接口(interface)中不存在该方法，这就是 Android 给您错误的原因。

See Context class Here和 View.OnClickListener Here

---

回答:

---

声明一个全局上下文变量。

       // Global Var
       Context context;

       // In onCreate
       context = this;

将此行更改为

       InputStream is = this.getContentResolver().openInputStream(uri);

这个:

       InputStream is = context.getContentResolver().openInputStream(uri);