Android 使用 DialogInterface 的 onClick() 方法

Using DialogInterface's onClick() method

提问by Ved

Here is my code to initialize the AlertDialog; buildexitis AlertDialog.Builderand exitalertis AlertDialog:

这是我的初始化代码AlertDialog；buildexit是AlertDialog.Builder并且exitalert是AlertDialog：

buildexit=new AlertDialog.Builder(this);
buildexit.setTitle("Exit?");
buildexit.setIcon(R.drawable.ic_action_warning);
buildexit.setMessage("Do you want to really exit?");
buildexit.setPositiveButton("Yes", this);
buildexit.setNegativeButton("No", this);
exitalert=buildexit.create();

I want to terminate the application using Activity.finish()method when the user clicks the "Yes" button, if "No" is click nothing should happen, I have also implemented the android.content.DialogInterface.OnClickListenerinterface, the method implemented is public void onClick(DialogInterface arg0, int arg1).
Thanks in advance.

我想Activity.finish()在用户单击“是”按钮时使用方法终止应用程序，如果“否”是单击什么都不应该发生，我也实现了android.content.DialogInterface.OnClickListener接口，实现的方法是public void onClick(DialogInterface arg0, int arg1).
提前致谢。

回答by Kyrremann

I know this is an old question, but if you are like me, and ended here because you where googling, this is probably what you are looking for.

我知道这是一个古老的问题，但如果你像我一样，并且因为你在谷歌上搜索而到此结束，这可能就是你正在寻找的。

To avoid creating a new DialogInterface.onClickListener()for each button, you can let the class implement AlertDialog.OnClickListener, and then override public void onClick(DialogInterface dialog, int which).

为了避免DialogInterface.onClickListener()为每个按钮创建一个新的，您可以让类实现AlertDialog.OnClickListener，然后覆盖public void onClick(DialogInterface dialog, int which)。

The int whichin this method is the button that was clicked, or the position. See the Android Referencefor more detailed information.

在int which该方法中是被点击的按钮或位置。有关更多详细信息，请参阅Android 参考。

So if you want to check which button was clicked you can use a switch-case and look for the constants BUTTON_NEGATIVE, BUTTON_NEUTRAL, and BUTTON_POSITIVE.

所以，如果你要检查哪个按钮被点击，您可以使用一个开关的情况下，寻找常数BUTTON_NEGATIVE，BUTTON_NEUTRAL和BUTTON_POSITIVE。

Example:

例子：

// skipping package and imports
public class TestActivity extends Activity implements AlertDialog.OnClickListener {

    void createAndShowDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.title);
        builder.setMessage(R.string.message);
        builder.setPositiveButton(android.R.string.yes, this);
        builder.setNeutralButton(android.R.string.cancel, this);
        builder.setNegativeButton(android.R.string.no, this);
        builder.create().show();
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case BUTTON_NEGATIVE:
                // int which = -2
                dialog.dismiss();
                break;
            case BUTTON_NEUTRAL:
                // int which = -3
                dialog.dismiss();
                break;
            case BUTTON_POSITIVE:
                // int which = -1
                TestActivity.this.finish();
                dialog.dismiss();
                break;
    }
}

回答by Rethinavel

Try this out :

试试这个：

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
            context);

        // set title
        alertDialogBuilder.setTitle("Your Title");

        // set dialog message
        alertDialogBuilder
            .setMessage("Click yes to exit!")
            .setCancelable(false)
            .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, close
                    // current activity
                    MainActivity.this.finish();
                }
              })
            .setNegativeButton("No",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    // if this button is clicked, just close
                    // the dialog box and do nothing
                    dialog.cancel();
                }
            });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }

回答by Kirit Vaghela

AlertDialog buildexit = new AlertDialog.Builder(this)
    .setTitle("Exit?")
    .setIcon(R.drawable.ic_launcher)
    .setMessage("Do you want to really exit?")
    .setPositiveButton("Yes", new OnClickListener() {

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

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

    buildexit.show();