Android学习笔记 - 长按选单(ContextMenu)

1. 在萤幕按下2至3秒之後出现选单，这是使用ContextMenu物件来达到此效果

2. 需覆写onCreateContextMenu及onContextItemSelected这二个方法

3. MainActivity.java

package org.me.android_contextmenu;
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);
        //注册长按选单
        this.registerForContextMenu(windowLayout);
    }


    @Override
    public boolean onContextItemSelected(MenuItem item) {
        //当使用者点选项目时，所需的动作
        Toast.makeText(this, "您选择的是"+item.getTitle(), Toast.LENGTH_SHORT).show();
        return super.onContextItemSelected(item);
    }


    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenuInfo menuInfo) {
        //设定选单内容
        super.onCreateContextMenu(contextMenu, view, menuInfo);
        contextMenu.add(0, 0, 0, "红茶");
        contextMenu.add(0, 1, 0, "奶茶");
        contextMenu.add(0, 2, 0, "绿茶");
        contextMenu.add(0, 3, 0, "青茶");
    }
}

3. main.xml(Layout)

4. 执行之後的画面。