如何从自定义对话框类关闭活动？

Question

我有一个 AlertDialogUtils 类，它生成一个 AlertDialog ，以便在发生错误时可以从任何活动调用它。问题是我无法从 createDialog() 方法中调用 finish() 作为“关闭”按钮的 onClickListener 。

有什么想法这可能吗？

AlertDialogUtils 类的代码：

public class AlertDialogUtils extends Dialog {

    private Context mContext;

    public AlertDialogUtils(Context context) {
        super(context);
        mContext = context;
    }

    public void CreateAlertDialog(String errorMessage) {
        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        builder.setMessage(errorMessage)
            .setCancelable(true)
            .setNeutralButton("Dismiss", new AlertDialog.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    mContext.finish(); 
                    //error here. Intend to close the activtiy that created this dialog and has the error
                }
            });
        AlertDialog alert = builder.create();
        alert.setOwnerActivity((Activity)mContext); 
        // The dialog utils is outside an activity. Need to set owner
        alert.show();
    }
}

Answer 1

可以请你尝试一下这个方法吗？ :

interface ICloseActivity {
void close();
}

class MyActivityToClose extends Activity implements ICloseActivity {

public void close() {
finish();
}

}

// -------

public class AlertDialogUtils extends Dialog {

    private Context mContext;

    private ICloseActivity mICloseActivity;

    public AlertDialogUtils(Context context, ICloseActivity aActivity) {
        super(context);
        mContext = context;
        mICloseActivity = aActivity;
    }

    public void CreateAlertDialog(String errorMessage) {
        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        builder.setMessage(errorMessage)
           .setCancelable(true)
           .setNeutralButton("Dismiss", new AlertDialog.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
               //    mContext.finish(); 
              //error here. Intend to close the activtiy that created this dialog and has the error

                //TRY THIS please:
                mICloseActivity.close();
               }
           });
    AlertDialog alert = builder.create();
    alert.setOwnerActivity((Activity)mContext); 
          // The dialog utils is outside an activity. Need to set owner
    alert.show();
}

Answer 2

不要在构造函数中传递 Context，而是传递 Activity。它继承了Context，因此您可以在任何需要Context的地方使用它；同时，您也可以在需要时调用finish()。

Answer 3

感谢您的建议。不幸的是，ICloseActivity 对我来说不起作用。我通过以下方式解决了完成活动并关闭对话框的问题：
我按如下方式更改了 CreateAlertDialog() 方法，并创建了一个辅助函数 exitActivity()：

public void CreateAlertDialog(String title, String errorMessage, int alertType){
    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
             builder.setTitle(title)  
        .setIcon(R.drawable.alert_icon)
        .setMessage(errorMessage)
        .setCancelable(false)
        .setPositiveButton("Dismiss", new AlertDialog.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           dismiss = true;
                           exitActivity();

                       }
                   });
        AlertDialog alert = builder.create();
        alert.setOwnerActivity((Activity)mContext);
            alert.show();
                }
             public void exitActivity() {
          this.getOwnerActivity().finish();
          }

在调用此实用程序时，我只需设置关闭侦听器并完成活动，以防万一被解雇了。

             dialog = new AlertDialogUtils(MyActivity.this);
    dialog.setOwnerActivity(MyActivity.this);
    dialog.CreateAlertDialog(getString(R.string.no_data),       
                        getString(R.string.empty_table_message), R.id.list_view_alertType);
    dialog.setOnDismissListener(new DialogInterface.OnDismissListener(){
        @Override
        public void onDismiss(DialogInterface arg0) {
            finish();
        }
    });

通过这种方式，如果需要，我可以处理关闭当前活动。
另外，对于我不想关闭而不是调用 exitActivity() 的活动，我调用了dialog.cancel()：

               .setPositiveButton("Dismiss", new AlertDialog.OnClickListener() {
             public void onClick(DialogInterface dialog, int id) {
                cancel();

             }
        });