2019独角兽企业重金招聘Python工程师标准>>> 
ch2_contextmenu.xml:
<?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/tv"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="这是一个上下文菜单ContextMenu的示例"/><EditText android:id="@+id/myEd"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>ContextMenuActivity.java :
package com.example.ch7;import com.example.baseexample.R;import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.EditText;
import android.widget.TextView;public class ContextMenuActivity extends Activity {private String tempStr;private TextView tv;private EditText myEd;public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.ch7_contextmenu);this.registerForContextMenu(findViewById(R.id.tv));this.registerForContextMenu(findViewById(R.id.myEd));}public void onCreateContextMenu(ContextMenu menu,View v,ContextMenuInfo menuInfo){menu.setHeaderIcon(R.drawable.ic_launcher);if(v==findViewById(R.id.tv)){menu.add(0,1,0,"复制");menu.add(0,2,0,"剪切");menu.add(0,3,0,"删除");}if(v==findViewById(R.id.myEd)){menu.add(0,4,0,"粘贴");menu.add(0,5,0,"删除");}}public boolean onContextItemSelected(MenuItem item){tv = (TextView)findViewById(R.id.tv);myEd = (EditText)findViewById(R.id.myEd);switch(item.getItemId()){case 1:tempStr = tv.getText().toString();break;case 2:tempStr = tv.getText().toString();tv.setText("");break;case 3:tv.setText("");break;case 4:myEd.setText(tempStr);break;case 5:myEd.setText("");break;}return true;}}
