Question

在具有自定义视图的自定义对话框类中，我要处理活动或片段中按钮的单击，我创建了一个界面来处理按钮单击但显示错误。

尝试在空对象引用上调用接口方法'void com.ymcaspi.util.CustomDialog $ DialogInterface.doLogin（com.ymcaspi.util.CustomDialog）'

我的对话课是

public class CustomDialog extends Dialog implements
    android.view.View.OnClickListener {
public Activity activity;
public Button btnYes, btnNo;
CustomDialog customDialog;
public CustomDialog(Activity activity) {
    super(activity);
    this.activity = activity;
}

DialogInterface dialogInterface;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.alert_login);
    btnYes = (Button) findViewById(R.id.btn_yes);
    btnNo = (Button) findViewById(R.id.btn_no);
    btnYes.setOnClickListener(this);
    btnNo.setOnClickListener(this);
}
//in custom adapter class i want to handle click of button from Activity or fragment, I have created a interface for handling button click
//but showing
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn_yes:
            customDialog=new CustomDialog(activity);
            dialogInterface.doLogin(customDialog);
            break;
        case R.id.btn_no:
            dismiss();
            break;
        default:
            break;
    }
    dismiss();
}



  public interface DialogInterface{
        void doLogin(CustomDialog dialog);

   }
}

我已经在片段中实现了此接口，但无法正常工作吗？

Answer 1

您没有在对话框上初始化 dialogInterface ，如果您在Activity上实现了接口，请将Activity设置为对话框界面

public CustomDialog(Activity activity,DialogInterface dialogInterface ) {
    super(activity);
    this.activity = activity;
    this.dialogInterface = dialogInterface ;
}

Answer 2

这里是一个示例，如果您打算从对话框中收到有关活动的回调，则可以尝试：

class YourActivity extends Activity implements DialogInterface {

    void showDialog() {
        CustomDialog dialog = // init your CustomDialog
        dialog.setOnLoginClickListener(this);
        dialog.show();
    }

    void doLogin() {
        // Button yes has been clicked, do stuff... 
    }
}

并创建一个方法来在您的CustomDialog类中分配侦听器：

public class CustomDialog extends Dialog implements OnClickListener {

    private DialogInterface dialogInterface;

    public void setOnLoginClickListener(DialogInterface dialogInterface) {
        this.dialogInterface = dialogInterface;
    }
}

使用来自片段或活动的自定义视图处理自定义对话框类的单击

2 个答案: