[转]Android应用中返回键的监听及处理
用户在点击手机的返回按钮时,默认是推出当前的activty,但是有时用户不小心按到返回,所以需要给用户一个提示,这就需要重写onkeydown事件,实现的效果如下:
标签: Android SDK
代码片段(2) [全屏查看所有代码]
2. [代码][Java]代码 跳至 [2] [全屏预览]
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@Override public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.main); } protected void dialog() { AlertDialog.Builder builder = new Builder(HanderTestActivty. this ); builder.setMessage( "确定要退出吗?" ); builder.setTitle( "提示" ); builder.setPositiveButton( "确认" , new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); HanderTestActivty. this .finish(); } }); builder.setNegativeButton( "取消" , new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); } @Override public boolean onKeyDown( int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0 ) { dialog(); return false ; } return false ; } |
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MainActivity如下:
main.xml如下: