Android 的菜单

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三种菜单：选项菜单(Option Menu)、上下文菜单(Context Menu)、子菜单(Sub Menu)

1. 选项菜单

选项菜单是绑定到Activity上的，onCreateOptionsMenu(Menumenu)创建菜单时调用，只在我们第一次打开菜单时调用，通关过menu的add方法添加MenuItem(项)，通过menu的Icon设置项的图片。菜单展示在Activity界面的右上角，当点击每项时触发onOptionsMenuSelected()

（1）在menu中添加展示的项

（2）重写onCreateOptionsMenu方法，加载menu项

（3）重写onOptionsItemSelected,设置点击执行的方法

<menu xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

tools:context="com.example.zicaidan.MainActivity">

<item

android:id="@+id/action_settings"

android:orderInCategory="100"

android:showAsAction="never"

android:title="@string/action_settings"/>

</menu>

@Override

publicboolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

publicboolean onOptionsItemSelected(MenuItem item) {

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

} }

2. 上下文菜单

是绑定到控件上的，每次控件的长按2s就会触发。每次点击设置了监听或注册了的视图，都会重新创建菜单项.

//菜单的使用1.直接对控件设置监听，并在activity中重写ContextItemSelected

//2.先对试图进行注册，然后重写onCreateContextMenu()添加上下菜单的头和选项，在重写onContextItemSelected添加处理事件

public classMainActivity extends Activity {

private ListView my_listview;

private List<String> list;

private Button button1;

private Button button2;

@Override

protected void onCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

my_listview = (ListView)findViewById(R.id.my_listview);

button1 = (Button)findViewById(R.id.button1);

button2 = (Button)findViewById(R.id.button2);

// 先对试图进行注册

registerForContextMenu(button2);

// 展示的是系统默认的布局

button1.setOnCreateContextMenuListener(newView.OnCreateContextMenuListener() {

@Override

public voidonCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfomenuInfo) {

menu.setHeaderIcon(R.drawable.ic_launcher);

menu.setHeaderTitle("上下文菜单");

//menu.setHeaderView(view);//设置自己的标题view

//menu.clearHeader();//清除菜单头

menu.add(0, 1, 0,"添加");

menu.add(0, 2, 0,"删除");

}

});

getData();

// 展示的是系统默认的布局

my_listview

.setOnCreateContextMenuListener(newView.OnCreateContextMenuListener() {

@Override

publicvoid onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfomenuInfo) {

menu.add(0,1, 0, "添加");

menu.add(0,2, 0, "删除");

}

});

}

// 用于button2的上下文菜单添加

@Override

public void onCreateContextMenu(ContextMenumenu, View v,

ContextMenuInfo menuInfo) {

super.onCreateContextMenu(menu, v,menuInfo);

switch (v.getId()) {

case R.id.button2:

menu.add(0, 1, 0, "添加");

menu.add(0, 2, 0, "删除");

break;

default:

break;

}

// 使用的是一个时间处理器

@Override

public boolean onContextItemSelected(MenuItemitem) {

String id = item.getItemId() +"";

switch (item.getItemId()) {

case 1:

Toast.makeText(MainActivity.this,"添加", Toast.LENGTH_LONG).show();

break;

case 2:

Toast.makeText(MainActivity.this,"删除", Toast.LENGTH_LONG).show();

break;

}

return true;

}

private void getData() {

list = new ArrayList<String>();

for (int i = 0; i < 20; i++) {

list.add("第" + i +"条数据");

}

MyAdapter adapter = new MyAdapter();

my_listview.setAdapter(adapter);

}

private class MyAdapter extends BaseAdapter {

@Override

public int getCount() {

// TODO Auto-generatedmethod stub

return list.size();

}

@Override

public Object getItem(int position) {

// TODO Auto-generatedmethod stub

return list.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position,View convertView, ViewGroup parent) {

TextView text = newTextView(MainActivity.this);

text.setHeight(40);

text.setGravity(Gravity.CENTER);

text.setTextSize(20);

text.setText(list.get(position));

return text;

}

3. 子菜单

子菜单的样式可以通过设置主题进行修改

@Override

publicboolean onCreateOptionsMenu(Menu menu) {

menu.add(0, 1, 0, "第一項");

menu.add(0,2, 0, "第二項");

menu.add(0,3, 0, "第三項");

SubMenumen = menu.addSubMenu("测试");//

menu.add(0,1, 0, "第一項");

menu.add(0,2, 0, "第二項");

menu.add(0,3, 0, "第三項");

menu.add(0,4, 0, "第四項");

menu.add(0,5, 0, "第五項");

menu.add(0,6, 0, "第六項");

returntrue;

}

@Override

publicboolean onOptionsItemSelected(MenuItem item) {

//Handle action bar item clicks here. The action bar will

//automatically handle clicks on the Home/Up button, so long

//as you specify a parent activity in AndroidManifest.xml.

switch(item.getItemId()) {

case1:

break;

case2:

break;

case3:

break;

case4:

break;

case5:

break;

case6:

break;

default:

break;

}

returnsuper.onOptionsItemSelected(item);

}

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