android ActionBar的使用
Action Bar主要功能包括:
1. 显示选项菜单
2. 提供标签页的切换方式的导航功能，能够切换多个fragment.
3. 提供下拉的导航条目.
4. 提供交互式活动视图取代选项条目
5. 使用程序的图标作为返回Home主屏或向上的导航操作。
首先说下，使用OverFlow的时候须要在onCreate()函数中调用例如以下方法：
private void forceShowOverflowMenu() {
try {
ViewConfiguration config = ViewConfiguration.get(this);
Field menuKeyField = ViewConfiguration.class
.getDeclaredField("sHasPermanentMenuKey");
if (menuKeyField != null) {
menuKeyField.setAccessible(true);
menuKeyField.setBoolean(config, false);
}
} catch (Exception e) {
e.printStackTrace();
}
}
注：此处未使用这样的实现方式。本应用中使用的PopupMen
下面是自己开发的项目所使用到的ActionBar:
public class ShopOrderActivity extends ActionBarActivity implements
OnTouchListener, OnMenuItemClickListener{
private Toast mToast;
private Context context;
/** AlertDialog中输入反馈框 */
private EditText et_FeedBack;
private PopupMenu popupMenu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shop_order);
//设置Home图标区域
// requestWindowFeature(Window.FEATURE_LEFT_ICON);
// setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, resId);
this.context = this;
mToast = Toast.makeText(this, "", Toast.LENGTH_LONG);
initActionBar();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.actionbar_menu, menu);
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.
int id = item.getItemId();
if (id == R.id.actionbar_overflow) {
if (popupMenu == null) {
popupMenu = new PopupMenu(this,
findViewById(R.id.actionbar_overflow));
popupMenu.inflate(R.menu.actionbar_pop);
popupMenu.setOnMenuItemClickListener(this);
}
popupMenu.show();
return true;
} else if (<pre name="code" class="java">public class ShopOrderActivity extends ActionBarActivity implements
OnTouchListener, OnMenuItemClickListener{
private Toast mToast;
private Context context;
/** AlertDialog中输入反馈框 */
private EditText et_FeedBack;
private PopupMenu popupMenu;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shop_order);
//设置Home图标区域
// requestWindowFeature(Window.FEATURE_LEFT_ICON);
// setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, resId);
this.context = this;
mToast = Toast.makeText(this, "", Toast.LENGTH_LONG);
initActionBar();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.actionbar_menu, menu);
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.
int id = item.getItemId();
if (id == R.id.actionbar_overflow) {
if (popupMenu == null) {
popupMenu = new PopupMenu(this,
findViewById(R.id.actionbar_overflow));
popupMenu.inflate(R.menu.actionbar_pop);
popupMenu.setOnMenuItemClickListener(this);
}
popupMenu.show();
return true;
} else if (id == android.R.id.home) {
finish();
} else if (id == R.id.new_order_bar) {
showTip("显示红点");
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onMenuItemClick(MenuItem arg0) {
Intent intent;
switch (arg0.getItemId()) {
case R.id.actionbar_settings:
intent = new Intent(this, SettingsActivity.class);
startActivity(intent);
break;
case R.id.historyOrder:
intent = new Intent(this, HistoryOrderActivity.class);
startActivity(intent);
break;
case R.id.logout:
AlertDialog.Builder builder = new AlertDialog.Builder(
ShopOrderActivity.this);
builder.setTitle("确定要退出吗？");
builder.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
showTip("退出登录！");
}
});
builder.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.create().show();
break;
}
return false;
}
/**
* 初始化ActionBar
*/
private void initActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setTitle("抢单");
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// actionBar.setIcon(R.drawable.back_menu);
// Drawable background = (Drawable) getResources()
// .getDrawable(R.drawable.top_bg);
// getActionBar().setBackgroundDrawable(background);
setTitleColor(this.getResources().getColor(R.color.green));// 没反应
}
/**
* 显示Toast
*
* @param str
*/
public void showTip(final String str) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mToast.setText(str);
mToast.show();
}
});
}
}
id == android.R.id.home当操作左上角icon图标的时候实现的功能是返回，配置清单须要设置：
<activity
android:name="com.shop.order.ShopOrderActivity"
android:launchMode="singleTop"
android:theme="@style/Theme.AppCompat.Light.DarkActionBar" >
</activity>
actionbar_menu的代码：
<?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/new_order_bar"
android:title="@string/new_order"
android:icon="@drawable/ic_launcher"
app:showAsAction="ifRoom|withText"/>
<item
android:id="@+id/actionbar_overflow"
android:icon="@drawable/abc_ic_menu_moreoverflow_normal_holo_dark"
android:title="@string/pop"
app:showAsAction="ifRoom|withText"/>
</menu>
注意：app:showAsAction="ifRoom|withText"假设写成android:showAsAction="ifRoom|withText"则不会在actionbar显示，当操作手机右下角的menu键时才会显示
actionbar_pop的代码：
<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" > <item android:id="@+id/actionbar_settings" android:title="@string/settings"/> <item android:id="@+id/historyOrder" android:title="@string/historyorder"/> <item android:id="@+id/logout" android:title="@string/logout"/> </menu>
分隔操作栏
当应用程序在Android4.0（API级别14）或以上的版本号执行，那么另一种叫做“分隔操作栏”的额外模式对action bar有效。当你启用分隔操作栏模式时。在屏幕的底部会显示一个独立的横条，用于显示Activity在窄屏幕社保上执行时的全部操作项。
要启用分离式操作栏。仅仅需简单的在<application>或<activity>元素中加入uiOptions=”splitActionBarWhenNarrow”属性设置就能够了。
下图中左边是未设置分离式操作栏。右边图是设置了分离式操作栏：
