ANDROID笔记：ContextMenu的用法

package com.example.android_menu;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class ContextMenuActivity extends Activity {
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.contextmenuactivity);
        textView = (TextView) findViewById(R.id.itemtext);
        registerForContextMenu(textView);

    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        menu.add(0, 1, 0, "红色");
        menu.add(0, 2, 0, "紫色");
        menu.add(0, 3, 0, "蓝色");
        menu.setGroupCheckable(0, true, false);

    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        item.setChecked(true);
        switch (item.getItemId()) {
        case 1:
            Toast.makeText(getApplicationContext(), "1", Toast.LENGTH_SHORT)
                    .show();
            textView.setBackgroundColor(Color.RED);
            break;

        case 2:
            Toast.makeText(getApplicationContext(), "2", Toast.LENGTH_SHORT)
                    .show();
            textView.setBackgroundColor(Color.YELLOW);
            break;
        case 3:
            Toast.makeText(getApplicationContext(), "3", Toast.LENGTH_SHORT)
                    .show();
            textView.setBackgroundColor(Color.BLUE);
            break;
        }
        return super.onContextItemSelected(item);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/itemtext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0000"
        android:textColor="#000000" />

</LinearLayout>