[置顶] Android Actionbar学习笔记（三）-----修改Actionbar的样式

http://blog.csdn.net/flying_tao/article/details/6655148

本例几乎涵盖了有关Actionbar的所有操作，由于前面介绍过tabs和item，这里重点介绍Actionbar的样式修改，需要源工程的请在资源里下载styleactionbar。更多请阅读http://android-developers.blogspot.com/2011/04/customizing-action-bar.html

1、首先准备一个RoundedColourFragment，前面介绍过各部分的作用，这里就不赘述。

import android.app.Fragment;
import android.graphics.drawable.GradientDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;

public class RoundedColourFragment extends Fragment {

    private View mView;
    private int mColour;
    private float mWeight;
    private int marginLeft, marginRight, marginTop, marginBottom;

    // need a public empty constructor for framework to instantiate
    public RoundedColourFragment() {

    }

    public RoundedColourFragment(int colour, float weight, int margin_left,
            int margin_right, int margin_top, int margin_bottom) {
        mColour = colour;
        mWeight = weight;
        marginLeft = margin_left;
        marginRight = margin_right;
        marginTop = margin_top;
        marginBottom = margin_bottom;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mView = new View(getActivity());

        GradientDrawable background = (GradientDrawable) getResources()
                .getDrawable(R.drawable.rounded_rect);
        background.setColor(mColour);

        mView.setBackgroundDrawable(background);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0,
                LayoutParams.FILL_PARENT, mWeight);
        lp.setMargins(marginLeft, marginTop, marginRight, marginBottom);
        mView.setLayoutParams(lp);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return mView;
    }

}

2、MainActivity.java文件，主要是创建tabs、item、drop down navigation等，以及他们之间相互转换的控制逻辑，一部分内容前面也介绍过。

import android.animation.ObjectAnimator;
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.app.ActionBar.OnNavigationListener;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.ArrayAdapter;

public class MainActivity extends Activity implements ActionBar.TabListener {

    private final Handler handler = new Handler();
    private RoundedColourFragment leftFrag;
    private RoundedColourFragment rightFrag;
    private boolean useLogo = false;
    private boolean showHomeUp = false;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final ActionBar ab = getActionBar();

        // set defaults for logo & home up
        ab.setDisplayHomeAsUpEnabled(showHomeUp);
        ab.setDisplayUseLogoEnabled(useLogo);

        // set up tabs nav
        for (int i = 1; i < 4; i++) {
            ab.addTab(ab.newTab().setText("Tab " + i).setTabListener(this));
        }

        // set up list nav
        ab.setListNavigationCallbacks(ArrayAdapter
                .createFromResource(this, R.array.sections,
                        android.R.layout.simple_spinner_dropdown_item),
                new OnNavigationListener() {
                    public boolean onNavigationItemSelected(int itemPosition,
                            long itemId) {
                        // FIXME add proper implementation
                        rotateLeftFrag();
                        return false;
                    }
                });

        // default to tab navigation
        showTabsNav();

        // create a couple of simple fragments as placeholders
        final int MARGIN = 16;
        leftFrag = new RoundedColourFragment(getResources().getColor(
                R.color.android_green), 1f, MARGIN, MARGIN / 2, MARGIN, MARGIN);
        rightFrag = new RoundedColourFragment(getResources().getColor(
                R.color.honeycombish_blue), 2f, MARGIN / 2, MARGIN, MARGIN,
                MARGIN);

        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.add(R.id.root, leftFrag);
        ft.add(R.id.root, rightFrag);
        ft.commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);

        // set up a listener for the refresh item
        final MenuItem refresh = (MenuItem) menu.findItem(R.id.menu_refresh);
        refresh.setOnMenuItemClickListener(new OnMenuItemClickListener() {
            // on selecting show progress spinner for 1s
            public boolean onMenuItemClick(MenuItem item) {
                // item.setActionView(R.layout.progress_action);
                handler.postDelayed(new Runnable() {
                    public void run() {
                        refresh.setActionView(null);
                    }
                }, 1000);
                return false;
            }
        });
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            // TODO handle clicking the app icon/logo
            return false;
        case R.id.menu_refresh:
            // switch to a progress animation
            item.setActionView(R.layout.indeterminate_progress_action);
            return true;
        case R.id.menu_both:
            // rotation animation of green fragment
            rotateLeftFrag();
            return true;
        case R.id.menu_text:
            // alpha animation of blue fragment
            ObjectAnimator alpha = ObjectAnimator.ofFloat(rightFrag.getView(),
                    "alpha", 1f, 0f);
            alpha.setRepeatMode(ObjectAnimator.REVERSE);
            alpha.setRepeatCount(1);
            alpha.setDuration(800);
            alpha.start();
            return true;
        case R.id.menu_logo:
            useLogo = !useLogo;
            item.setChecked(useLogo);
            getActionBar().setDisplayUseLogoEnabled(useLogo);
            return true;
        case R.id.menu_up:
            showHomeUp = !showHomeUp;
            item.setChecked(showHomeUp);
            getActionBar().setDisplayHomeAsUpEnabled(showHomeUp);
            return true;
        case R.id.menu_nav_tabs:
            item.setChecked(true);
            showTabsNav();
            return true;
        case R.id.menu_nav_label:
            item.setChecked(true);
            showStandardNav();
            return true;
        case R.id.menu_nav_drop_down:
            item.setChecked(true);
            showDropDownNav();
            return true;
        case R.id.menu_bak_none:
            item.setChecked(true);
            getActionBar().setBackgroundDrawable(null);
            return true;
        case R.id.menu_bak_gradient:
            item.setChecked(true);
            getActionBar().setBackgroundDrawable(getResources().getDrawable(R.drawable.ad_action_bar_gradient_bak));
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    private void rotateLeftFrag() {
        if (leftFrag != null) {
            ObjectAnimator.ofFloat(leftFrag.getView(), "rotationY", 0, 180)
                    .setDuration(500).start();
        }
    }

    private void showStandardNav() {
        ActionBar ab = getActionBar();
        if (ab.getNavigationMode() != ActionBar.NAVIGATION_MODE_STANDARD) {
            ab.setDisplayShowTitleEnabled(true);
            ab.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        }
    }

    private void showDropDownNav() {
        ActionBar ab = getActionBar();
        if (ab.getNavigationMode() != ActionBar.NAVIGATION_MODE_LIST) {
            ab.setDisplayShowTitleEnabled(false);
            ab.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        }
    }

    private void showTabsNav() {
        ActionBar ab = getActionBar();
        if (ab.getNavigationMode() != ActionBar.NAVIGATION_MODE_TABS) {
            ab.setDisplayShowTitleEnabled(false);
            ab.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        }
    }

    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
        // FIXME add a proper implementation, for now just rotate the left
        // fragment
        rotateLeftFrag();
    }

    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
        // FIXME implement this
    }

    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
        // FIXME implement this
    }

}

3、在res/values下的styles.xml文件，这里是本程序讲解的核心，也是actionbar样式转换的核心，java代码如下：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!-- Base application theme is the default theme. -->
    <style name="Theme" parent="android:Theme"></style>

    <!-- Variation on the Holo Light theme that styles the Action Bar -->
    <!-- style的名字是Theme.AndroidDevelopers，父类为Theme.Holo.Light，即白底黑字（如果是Theme.Holo，则为黑底白字）-->
    <style name="Theme.AndroidDevelopers" parent="android:style/Theme.Holo.Light">
        <!-- 这是items的颜色变化，未选中时为白色，选中时为绿色，逻辑请见ad_selectable_background.xml -->
        <item name="android:selectableItemBackground">@drawable/ad_selectable_background</item>
        <!-- 其他部分的颜色变化跟上面类似 -->
        <item name="android:popupMenuStyle">@style/MyPopupMenu</item>
        <item name="android:dropDownListViewStyle">@style/MyDropDownListView</item>
        <item name="android:actionBarTabStyle">@style/MyActionBarTabStyle</item>
        <item name="android:actionDropDownStyle">@style/MyDropDownNav</item>
        <item name="android:listChoiceIndicatorMultiple">@drawable/ad_btn_check_holo_light</item>
        <item name="android:listChoiceIndicatorSingle">@drawable/ad_btn_radio_holo_light</item>
        <!--<item name="android:actionOverflowButtonStyle">@style/MyOverflowButton</item>-->
    </style>

    <!-- style the overflow menu -->
    <style name="MyPopupMenu" parent="android:style/Widget.Holo.Light.ListPopupWindow">
        <item name="android:popupBackground">@drawable/ad_menu_dropdown_panel_holo_light</item>
    </style>

    <!-- style the items within the overflow menu -->
    <style name="MyDropDownListView" parent="android:style/Widget.Holo.ListView.DropDown">
        <item name="android:listSelector">@drawable/ad_selectable_background</item>
    </style>

    <!-- style for the tabs -->
    <style name="MyActionBarTabStyle" parent="android:style/Widget.Holo.Light.ActionBarView_TabView">
        <item name="android:background">@drawable/actionbar_tab_bg</item>
        <item name="android:paddingLeft">32dp</item>
        <item name="android:paddingRight">32dp</item>
    </style>

    <!-- style the list navigation -->
    <style name="MyDropDownNav" parent="android:style/Widget.Holo.Light.Spinner.DropDown.ActionBar">
        <item name="android:background">@drawable/ad_spinner_background_holo_light</item>
        <item name="android:popupBackground">@drawable/ad_menu_dropdown_panel_holo_light</item>
        <item name="android:dropDownSelector">@drawable/ad_selectable_background</item>
    </style>

    <!-- the following can be used to style the overflow menu button
         only do this if you have an *extremely* good reason to!! -->
    <!--<style name="MyOverflowButton" parent="@android:style/Widget.Holo.ActionButton.Overflow">
        <item name="android:src">@android:drawable/ic_menu_view</item>
        <item name="android:background">@drawable/action_button_background</item>
    </style>-->

</resources>

      把style设置好后，只需在AndroidManifest.xml中application或activity的位置加上<activity android:name=".MainActivity"  android:theme="@style/Theme.AndroidDevelopers"&gt;即可，作用于一个应用程序或者一个activity。

      细心的读者可能会发现，其实以前android的属性拿过来都能用，比如说修改actionbar的高度，<android：height=…>，只需把这些属性放在对应的位置，作为一个<item>存在即可。

4、res/drawable下的一些xml文件，即actionbar修改所需的资源。

4、1------actionbar_tab_bg.xml，用于tab的背景修改。曾一度认为只需在系统tab的基础上修改一下颜色即可，其实不然。需另外弄几张图片，（如我想把tab改成红色背景，那么我就要找几张红色背景的图片）。

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

    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/ad_tab_unselected_holo" />
    <item android:state_focused="false" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/ad_tab_selected_holo" />
    <item android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/ad_tab_selected_pressed_holo" />
    <item android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/ad_tab_selected_pressed_holo" />

</selector>

4、2------ad_action_bar_gradient_bak.xml，用于actionbar的颜色渐变，本例是从顶到底颜色逐渐变浅。

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <gradient
        android:startColor="@color/honeycombish_blue"
        android:endColor="@color/background"
        android:type="linear"
        android:angle="270" />
</shape>

4、3------ad_btn_check_holo_light.xml，用于单选背景的变换。

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

    <!-- Enabled states -->
    <item android:state_checked="true" android:state_window_focused="false"
        android:state_enabled="true" android:drawable="@drawable/btn_check_on_holo_light" />

    <item android:state_checked="false" android:state_window_focused="false"
        android:state_enabled="true" android:drawable="@drawable/btn_check_off_holo_light" />

    <item android:state_checked="true" android:state_pressed="true"
        android:state_enabled="true" android:drawable="@drawable/ad_btn_check_on_pressed_holo_light" />

    <item android:state_checked="false" android:state_pressed="true"
        android:state_enabled="true" android:drawable="@drawable/ad_btn_check_off_pressed_holo_light" />

    <!-- ignoring focused states for brevity
    <item android:state_checked="true" android:state_focused="true"
        android:state_enabled="true" android:drawable="@drawable/btn_check_on_focused_holo_light" />

    <item android:state_checked="false" android:state_focused="true"
        android:state_enabled="true" android:drawable="@drawable/btn_check_off_focused_holo_light" />
    -->

    <item android:state_checked="false" android:state_enabled="true"
        android:drawable="@drawable/btn_check_off_holo_light" />

    <item android:state_checked="true" android:state_enabled="true"
        android:drawable="@drawable/btn_check_on_holo_light" />

    <!-- ignoring disabled states for brevity
    <item android:state_checked="true" android:state_window_focused="false"
        android:drawable="@drawable/btn_check_on_disabled_holo_light" />

    <item android:state_checked="false" android:state_window_focused="false"
        android:drawable="@drawable/btn_check_off_disabled_holo_light" />

    <item android:state_checked="true" android:state_focused="true"
        android:drawable="@drawable/btn_check_on_disabled_focused_holo_light" />

    <item android:state_checked="false" android:state_focused="true"
        android:drawable="@drawable/btn_check_off_disabled_focused_holo_light" />

    <item android:state_checked="false"
        android:drawable="@drawable/btn_check_off_disabled_holo_light" />

    <item android:state_checked="true"
        android:drawable="@drawable/btn_check_on_disabled_holo_light" />
     -->

</selector>

4、4------ad_btn_radio_holo_light.xml，用于多选背景的变换。

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

    <!-- Enabled states -->
    <item android:state_checked="true" android:state_window_focused="false"
        android:state_enabled="true" android:drawable="@drawable/btn_radio_on_holo_light" />

    <item android:state_checked="false" android:state_window_focused="false"
        android:state_enabled="true" android:drawable="@drawable/btn_radio_off_holo_light" />

    <item android:state_checked="true" android:state_pressed="true"
        android:state_enabled="true" android:drawable="@drawable/ad_btn_radio_on_pressed_holo_light" />

    <item android:state_checked="false" android:state_pressed="true"
        android:state_enabled="true" android:drawable="@drawable/ad_btn_radio_off_pressed_holo_light" />

    <!-- ignoring focused states for brevity
    <item android:state_checked="true" android:state_focused="true"
        android:state_enabled="true" android:drawable="@drawable/btn_radio_on_focused_holo_light" />

    <item android:state_checked="false" android:state_focused="true"
        android:state_enabled="true" android:drawable="@drawable/btn_radio_off_focused_holo_light" />
    -->

    <item android:state_checked="false" android:state_enabled="true"
        android:drawable="@drawable/btn_radio_off_holo_light" />

    <item android:state_checked="true" android:state_enabled="true"
        android:drawable="@drawable/btn_radio_on_holo_light" />

    <!-- ignoring disabled states for brevity
    <item android:state_checked="true" android:state_window_focused="false"
        android:drawable="@drawable/btn_radio_on_disabled_holo_light" />

    <item android:state_checked="false" android:state_window_focused="false"
        android:drawable="@drawable/btn_radio_off_disabled_holo_light" />

    <item android:state_checked="true" android:state_focused="true"
        android:drawable="@drawable/btn_radio_on_disabled_focused_holo_light" />

    <item android:state_checked="false" android:state_focused="true"
        android:drawable="@drawable/btn_radio_off_disabled_focused_holo_light" />

    <item android:state_checked="false"
        android:drawable="@drawable/btn_radio_off_disabled_holo_light" />

    <item android:state_checked="true"
        android:drawable="@drawable/btn_radio_on_disabled_holo_light" />
    -->

</selector>

4、5------ad_btn_radio_holo_light.xml，用于item背景的变换，未选中时为透明，选中未绿色。

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
          android:exitFadeDuration="@android:integer/config_mediumAnimTime" >
    <item android:state_pressed="true" android:drawable="@drawable/selected_background" />
    <item android:drawable="@android:color/transparent" />
</selector>

4、6------ad_spinner_background_holo_light.xml，用于下拉列表背景的变换。

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="false"
          android:drawable="@drawable/spinner_disabled_holo_light" />
    <item android:state_pressed="true"
          android:drawable="@drawable/ad_spinner_pressed_holo_light" />
    <item android:state_pressed="false" android:state_focused="true"
          android:drawable="@drawable/ad_spinner_focused_holo_light" />
    <item android:drawable="@drawable/spinner_default_holo_light" />
</selector>

4、7------rounded_rect.xml，用于本例RoundedColourFragment视图的设置。

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <corners android:radius="@dimen/frag_rounding_radius" />
</shape>

dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="frag_rounding_radius">20dp</dimen>
    <dimen name="progress_action_padding">8dp</dimen>
</resources>

     至此，这个工程的逻辑介绍完毕。言语介绍肯定不会很明白，需要的同行可看源代码，相信各位精英能很快领悟到其中的技术，应用到自己的工程中去，使actionbar具有各自工程的特色。