Android 程序退出确认功能开发 .

程序都需要退出确认功能，方式有很多种。不多说。
方法一：

[java]
view plaincopyprint?

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
if (event.getAction() == KeyEvent.ACTION_DOWN
&& event.getRepeatCount() == 0) {
this.confirmExit();// 这是自定义的代码

}
return true;
}

return super.dispatchKeyEvent(event);
}

private void confirmExit() {
// 退出确认
AlertDialog.Builder ad = new AlertDialog.Builder(PGisMainActivity.this);
ad.setTitle("退出");
ad.setIcon(R.drawable.ic_launcher);
ad.setMessage("是否退出系统?");
ad.setPositiveButton("是", new DialogInterface.OnClickListener() {
// 退出按钮
@Override
public void onClick(DialogInterface dialog, int i) {
isRunning = false;

}
});
ad.setNegativeButton("否", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
// 不退出不用执行任何操作

}
});
ad.show();// 显示对话框
}

方法二：

[java]
view plaincopyprint?





@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
exitApplication();
}
return true;
}
private void exitApplication() {
Builder builder = new Builder(this);
builder.setIcon(R.drawable.ic_launcher);
builder.setTitle("退出");
builder.setMessage("确定退出吗？");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {
System.exit(0);

}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface arg0, int arg1) {

}
});
builder.show();
}