Android學習筆記 - 長按選單(ContextMenu)

1. 在螢幕按下2至3秒之後出現選單，這是使用ContextMenu物件來達到此效果

2. 需覆寫onCreateContextMenu及onContextItemSelected這二個方法

3. MainActivity.java

import android.app.Activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        LinearLayout windowLayout = (LinearLayout) findViewById(R.id.windowLayout);
        //註冊長按選單
        this.registerForContextMenu(windowLayout);
    }


    @Override
    public boolean onContextItemSelected(MenuItem item) {
        //當使用者點選項目時，所需的動作
        Toast.makeText(this, "您選擇的是"+item.getTitle(), Toast.LENGTH_SHORT).show();
        return super.onContextItemSelected(item);
    }


    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenuInfo menuInfo) {
        //設定選單內容
        super.onCreateContextMenu(contextMenu, view, menuInfo);
        contextMenu.add(0, 0, 0, "紅茶");
        contextMenu.add(0, 1, 0, "奶茶");
        contextMenu.add(0, 2, 0, "綠茶");
        contextMenu.add(0, 3, 0, "青茶");
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/windowLayout">
</LinearLayout>

4. 執行之後的畫面。