android应用开发详解（四）----------各种菜单（optionmenu、contextmenu、submenu）和Toast的使用

package com.example.testoptionmenu;

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

public class TestOptionMenuActivity extends Activity {
private static final int ITEM1 = Menu.FIRST;
private static final int ITEM2 = Menu.FIRST + 1;

private static final int CONTEXTITEM1 = Menu.FIRST;
private static final int CONTEXTITEM2 = Menu.FIRST + 1;
private static final int CONTEXTITEM3 = Menu.FIRST + 2;

private static final int SUBITEM1 = Menu.FIRST;
private static final int SUBITEM2 = Menu.FIRST + 1;
private TextView myTextView;
private Button myButton1;
private Button myButton2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_option_menu);
myTextView = (TextView) findViewById(R.id.layoutTextView01);
myButton1 = (Button) findViewById(R.id.layoutButton01);
myButton2 = (Button) findViewById(R.id.layoutButton02);
registerForContextMenu(myTextView);
final int l = Toast.LENGTH_LONG;
final int s = Toast.LENGTH_SHORT;
final String ls = "我多显示一会儿！";
final String ss = "我少显示一会儿！";
myButton1.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), ls, l).show();
}
});
myButton2.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), ss, s).show();
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.test_option_menu, menu);
// 添加菜单项
menu.add(0, ITEM1, 0, "开始");
menu.add(0, ITEM2, 0, "退出");
// 添加子菜单
SubMenu file = menu.addSubMenu("文件");
SubMenu edit = menu.addSubMenu("编辑");
// 为子菜单添加菜单项
file.add(0, SUBITEM1, 0, "新建");
file.add(0, SUBITEM2, 0, "打开");
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case ITEM1:
setTitle("开始游戏！");

break;

case ITEM2:
setTitle("退出");
break;
}
// 子菜单项的处理
switch (item.getItemId()) {
case SUBITEM1:
setTitle("新建文件！");
break;
case SUBITEM2:
setTitle("打开文件！");
break;
}
return true;
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
// super.onCreateContextMenu(menu, v, menuInfo);
// 添加菜单项
menu.add(0, CONTEXTITEM1, 0, "红色背景");
menu.add(0, CONTEXTITEM2, 0, "绿色背景");
menu.add(0, CONTEXTITEM3, 0, "白色背景");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
// return super.onContextItemSelected(item);
switch (item.getItemId()) {
case CONTEXTITEM1:
myTextView.setBackgroundColor(Color.RED);
break;

case CONTEXTITEM2:
myTextView.setBackgroundColor(Color.GREEN);
break;
case CONTEXTITEM3:
myTextView.setBackgroundColor(Color.WHITE);
break;
}
return true;
}

}

<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/layoutTextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<LinearLayout
android:id="@+id/layoutLinear01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >

<Button
android:id="@+id/layoutButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="长时间" />

<Button
android:id="@+id/layoutButton02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="短时间" />
</LinearLayout>

</LinearLayout>