Question

我正在打开警报对话框活动。一切都很好，唯一的问题是用户在AndroidCommand活动中按下 - alertdialog完全打开，但再次按下后退按钮 - 只是对话框关闭，而不是对话框活动。所以它需要两次背压才能回到AndroidCommand活动。取消对话框时，如何关闭活动对话框？

public class AndroidCommand extends Activity {

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

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (KeyEvent.KEYCODE_BACK == event.getKeyCode()) {

            Intent intent = new Intent(AndroidCommand.this, MainActivity.class);
            startActivity(intent);
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

public class MainActivity extends Activity {

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

        final String items[] = {"Movie","Music","Book"};
        AlertDialog.Builder ab=new AlertDialog.Builder(MainActivity.this);
        ab.setTitle("Dialog Title");
        ab.setItems(items, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface d, int choice) {
                if(choice == 0) {

                }
                else if(choice == 1) {

                }
                else if(choice == 2) {

                }
            }
        });
        ab.show();
    }

Answer 1

这是完整的解决方案

    public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        if (!isBack)
            showDialog();
        else
            isBack = true;
        return true;
    }
    else
        return super.onKeyDown(keyCode, event);
}

在oncreatemethod中初始化isBack = false

    void showDialog () {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Alert");
    builder.setMessage("Are you sure you want to exit?");
    builder.setPositiveButton("OK", new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {


            finish();
        }
    });

    builder.setNegativeButton("Cancel", new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            isBack = false;
        }
    });
    builder.show();
}

Answer 2

呼叫

finish()

按下后退方法

 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  if (KeyEvent.KEYCODE_BACK == event.getKeyCode()) {

    finish();
    return true;

 }
 return super.onKeyDown(keyCode, event);
 }

Answer 3

只是覆盖，

      @Override
public void onBackPressed() {
    // TODO Auto-generated method stub
//  super.onBackPressed();


 new AlertDialog.Builder(this)
            .setTitle("Dictation Alert")
            .setIcon(R.drawable.galleryalart)
            .setMessage("Do You want save dictation??")
            .setNegativeButton(android.R.string.no, new OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int          which)    {

      //do other stuff here      
        finish()
    }
      })
 .setPositiveButton("yes", new OnClickListener() {

  //do other stuff here      
  finish()
   }).show
   }

如何在按下后关闭具有警报对话框的活动？

3 个答案: