如何显示警告对话框时，硬件主页按钮pressed？

问题描述

我用下面的code，显示一个警告对话框，当硬件home键是pressed。

I had used the following code to show an alert dialog when Hardware home button is pressed.

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_HOME)) {
        System.out.println("KEYCODE_HOME");
        showDialog("'HOME'");
        return true;
    }
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        System.out.println("KEYCODE_BACK");
        showDialog("'BACK'");
        return true;
    }
    if ((keyCode == KeyEvent.KEYCODE_MENU)) {
        System.out.println("KEYCODE_MENU");
        showDialog("'MENU'");
        return true;
    }
    return false;
}

void showDialog(String the_key){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("You have pressed the " + the_key + " button. Would you like to exit the app?")
          .setCancelable(true)
           .setPositiveButton("OK", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   dialog.cancel();
                   finish();
               }
           })
           .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
               }
           });
    AlertDialog alert = builder.create();
    alert.setTitle("CoderzHeaven.");
    alert.show();
}
@Override
public void onAttachedToWindow() {
    super.onAttachedToWindow();
    this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);

}

public void onUserLeaveHint() {
    super.onUserLeaveHint();
    System.out.println("HOMEEEEEEEEE");
}

这工作在API版本低于14，细而在较高版本的应用程序被撞坏表示无差错之后增加一个窗口，窗口不能改变。而我才知道错误是由于该行

This works fine in api version less than 14. But in higher versions app gets crashed showing an error- "Window cannot be changed after a window is added". And i came to know the error is due to this line

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);

当我把这个行注释的警告对话框中没有显示。
反正是有显示警告对话框更高版本？

When i put this line in comment the alert dialog is not showing.Is there anyway to show alert dialog in higher versions?

推荐答案

从技术上讲，你水湿覆盖home键。
如果你仍然有兴趣，你可以尝试把这个在您的主要活动在AndroidManifest.xml

Technically you cann't override home button.If you still interested, you could try putting this in your main activity in AndroidManifest.xml

<activity
...
android:launchMode="singleTask">
<intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
    <category android:name="android.intent.category.HOME" />
    <category android:name="android.intent.category.DEFAULT" />
    ....
</intent-filter>

这篇关于如何显示警告对话框时，硬件主页按钮pressed？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！