创建上下文菜单

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fragment_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.xwy.cai.MainActivity$PlaceholderFragment"    android:orientation="vertical"     >    <TextView        android:id="@+id/show"        android:textSize="28px"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="打开菜单" /></LinearLayout>

contentmenu.xml

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:id="@+id/color1" android:title="红色"></item><item android:id="@+id/color2" android:title="绿色"></item><item android:id="@+id/color3" android:title="蓝色"></item><item android:id="@+id/color4" android:title="橙色"></item><item android:id="@+id/color5" android:title="恢复默认"></item></menu>

MainActivity.java

package com.xwy.cai;import android.support.v4.app.Fragment;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class MainActivity extends Activity {private TextView tv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fragment_main);tv=(TextView)findViewById(R.id.show);registerForContextMenu(tv);//为文本框注册上下文菜单}//创建上下文菜单/************************************************************/public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {MenuInflater inflator=new MenuInflater(this); //实例化一个MenuInflater对象inflator.inflate(R.menu.contentmenu, menu); //解析菜单文件menu.setHeaderIcon(R.drawable.ic_launcher);//为菜单头设置图标menu.setHeaderTitle("请选择文字颜色：");//为菜单头设置标题}@Overridepublic boolean onContextItemSelected(MenuItem item) {switch(item.getItemId()){case R.id.color1://当选择红颜色时tv.setTextColor(Color.rgb(255, 0, 0));break;case R.id.color2://当选择绿颜色时tv.setTextColor(Color.rgb(0, 255, 0));break;case R.id.color3://当选择蓝颜色时tv.setTextColor(Color.rgb(0, 0, 255));break;case R.id.color4://当选择橙色时tv.setTextColor(Color.rgb(255, 180, 0));break;default:tv.setTextColor(Color.rgb(255, 255, 255));}return true;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/** * A placeholder fragment containing a simple view. */public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View rootView = inflater.inflate(R.layout.fragment_main, container,false);return rootView;}}}

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