事件处理---屏蔽后退键

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代码:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="屏蔽后退键"        android:textColor="@android:color/black"        android:textSize="25dp" /></LinearLayout>

MainActivity.java

package com.example.forbiddenback;import android.app.Activity;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode==KeyEvent.KEYCODE_BACK){return true;}return super.onKeyDown(keyCode, event);}    }

截图：

总结：图中的后退键便无法使用

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