Android中Toolbar的实现

实现：

① 溢出菜单显示在右上角

②操作栏button icon的实现

③溢出菜单里显示icon

④返回到父级（向上箭头的实现）

⑤更换溢出按钮的图标（...变+）

坑：

①app

②v7

③onPrepareOptionsPanel

package com.syz.lianxi;

import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;

import java.lang.reflect.Method;

/**
 * Created by 永贞 on 2016/8/7.
 */
public class MenuDemo extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menudemo);

//设置显示Toolbar  让菜单显示在顶部
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);

//父布局 自动在操作栏添加返回到父Activity的箭头并实现其功能
ActionBar ab=getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);

}

/**
     * 创建填充菜单（显示出来）
* @param menu
* @return
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.menudemo,menu);/*填充菜单*/

return true;
}


/**
     * 让溢出菜单里的图标icon显示出来*/
@Override
protected boolean onPrepareOptionsPanel(View view, Menu menu) {
if (menu != null) {
if (menu.getClass().getSimpleName().equals("MenuBuilder")) {
try {
                    Method m = menu.getClass().getDeclaredMethod(
"setOptionalIconsVisible", Boolean.TYPE);
m.setAccessible(true);
m.invoke(menu, true);
} catch (Exception e) {
                    Log.e(getClass().getSimpleName(), "onMenuOpened...unable to set icons for overflow menu", e);
}
            }
        }
return super.onPrepareOptionsPanel(view, menu);
}


/**
     * 实现菜单的点击事件*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.action_favorite:

return true;
            case R.id.action_settings:

return true;
            default:

return super.onOptionsItemSelected(item);
}

    }
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
android:id="@+id/action_favorite"
android:icon="@drawable/ic_action_star"
android:title="收藏">
    </item>

    <item
android:id="@+id/action_settings"
android:title="帮助"
android:icon="@drawable/ic_action_help"
app:showAsAction="never">
    </item>

    <item
android:id="@+id/action_search"
android:title="搜索"
android:icon="@drawable/ic_action_search"
app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.support.v7.widget.SearchView">
    </item>

    <item
android:id="@+id/action_share"
android:title="分享"
android:icon="@drawable/ic_action_share"
app:showAsAction="ifRoom"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider"/>

</menu>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
android:popupTheme="@style/Theme.AppCompat.Light"/>
</LinearLayout>

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme.NoActionBar"><!--为使用Toolbar-->
<activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
    <activity
android:name=".MenuDemo"
android:parentActivityName=".MainActivity">
        <meta-data android:name="android.support.PARENT_ACTIVITY"
android:value=".MainActivity"/><!--回退到父activity-->
</activity>
</application>

<style name="AppTheme.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="android:actionOverflowButtonStyle">@style/menu_add</item><!--更换溢出菜单的图标-->

</style>
<style name="menu_add">
    <item name="android:src">@drawable/ic_action_add</item>
</style>