如何更改Fragment的Back按钮事件

Question

当我点击“返回”按钮时，我想让对话框解除。像这样：

但现在，当我点击后退按钮时，此应用程序退出！这是我在网上找到的方法，但它不起作用！

mBaseView.setOnKeyListener(new OnKeyListener() {

            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                // TODO Auto-generated method stub
                if (keyCode == KeyEvent.KEYCODE_BACK){
                    if (listAdapter.isShow) {
                        cancle();
                        return true;
                    }
                  }
                return false;
            }
        });

Answer 1

@Override
public void onBackPressed(){

    AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
    alert.setTitle("Exit Fest");
    alert.setMessage("Are you sure to exit the application?");
    alert.setPositiveButton("YES", new OnClickListener(){

        @Override
        public void onClick(DialogInterface dialog, int which) {
            finish();
        }
    });
    alert.setNegativeButton("NO",new OnClickListener(){

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });
    AlertDialog dialog =alert.create();
    dialog.show();
}

Answer 2

试试这个......

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
       yourdialog.dismiss();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}