Android ActionBar: androidactionbar

Android ActionBar: androidactionbar

1. Guide, examples, personal feelings

First on the official website guide link http://developer.android.com/guide/topics/ui/actionbar.html

Refer to the examples on the official website http://developer.android.com/samples/ActionBarCompat-Basic/index.html

At first glance, the guide shows that ActionBar is similar to include heder.html, which is commonly used in web development. For example, the first line of the cnblog page.

 

2. compatibility problems: sdk 11 and above can be used directly, sdk 11 and below need support-v7

PS: the two types of configuration files must be different as follows. Note the following: # Use the ActionBar configuration that comes with sdk 11.

<menu xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:support="http://schemas.android.com/apk/res-auto"# xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    tools:context="com.example.actionbar.MainActivity" >    <item        android:id="@+id/action_settings"        android:orderInCategory="100"        android:title="@string/action_settings"        support:showAsAction="never"        #app:showAsAction="never"/>        <item        android:id="@+id/menu_refresh"        android:icon="@drawable/ic_action_refresh"        android:title="@string/menu_refresh"        support:showAsAction="ifRoom"        />        

 

3. Constructor

There are configuration files and two types of building in the program code

@ Override public boolean onCreateOptionsMenu (Menu menu ){
Build getMenuInflater () in the configuration file (). inflate (R. menu. main, menu); MenuItem locationItem = menu. add (0, R. id. menu_location, 0, R. string. menu_location );

Program build locationItem. setIcon (R. drawable. ic_action_location); MenuItemCompat. setShowAsAction (locationItem, MenuItem. SHOW_AS_ACTION_IF_ROOM); return true ;}

 

4. Full code

package com.example.actionbar;import android.annotation.SuppressLint;import android.annotation.TargetApi;import android.os.Build;import android.os.Bundle;import android.support.v4.view.MenuItemCompat;import android.support.v7.app.ActionBar;import android.support.v7.app.ActionBarActivity;import android.view.Menu;import android.view.MenuItem;//@SuppressLint("NewApi")public class MainActivity extends ActionBarActivity {        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.sample_main);   // android.app.ActionBar actionBar =  getActionBar();    //actionBar.hide();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        MenuItem locationItem = menu.add(0,R.id.menu_location,0,R.string.menu_location);        locationItem.setIcon(R.drawable.ic_action_location);        MenuItemCompat.setShowAsAction(locationItem, MenuItem.SHOW_AS_ACTION_IF_ROOM);        return true;    }    @Override    public boolean 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()) {        case R.id.menu_refresh:            // Here we might start a background refresh task            return true;        case R.id.menu_location:            // Here we might call LocationManager.requestLocationUpdates()            return true;        case R.id.menu_settings:            // Here we would open up our settings activity            return true;        case R.id.action_settings:            // Here we would open up our settings activity            return true;    }        return super.onOptionsItemSelected(item);    }}

5. Follow-up .....