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

2014-06-10 22:22 369 查看

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。

[java]
view plaincopy

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。

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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：

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


<style name="Theme" parent="android:Theme"></style>



<style name="Theme.AndroidDevelopers" parent="android:style/Theme.Holo.Light">

<item name="android:selectableItemBackground">@drawable/ad_selectable_background</item>

<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>

</style>


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


<style name="MyDropDownListView" parent="android:style/Widget.Holo.ListView.DropDown">
<item name="android:listSelector">@drawable/ad_selectable_background</item>
</style>


<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 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>




</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">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）。

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<?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。

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<?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。

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


<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" />



<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" />



</selector>

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

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


<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" />



<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" />



</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。

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<?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。

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<?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。

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<?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

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<?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。

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