Android Action Bar 自定义View

接着上一篇Action Bar 加入Back键, 在Action Bar中加入自定义View. 依然先看效果:

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actionbar自定义view的布局文件action_bar.xml, 此处能够任意发挥, 实现脑海中的自定义View.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="horizontal">
    <TextView
        android:id="@+id/action_bar_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#EEA9B8"
        android:text="@string/action_bar_title" />
    <Spinner
        android:id="@+id/action_bar_spinner"
        android:layout_width="wrap_content"
        android:layout_height="match_parent" >
    </Spinner>
</LinearLayout>

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上边的自定义View里面我用了个Spinner, 那Spinner的Item的布局, 借用了以前抽屉导航Item的布局drawer_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="horizontal" >
    <ImageView
        android:id="@+id/drawer_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/drawer_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

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布局准备好了, 接下来就是在Activity里面写一些.

首先是onCreate()方法里面准备一下.

/** action_bar添加自定义view */
View actionbarLayout = LayoutInflater.from(this).inflate(R.layout.action_bar, null);
mActionbarSpinne = (Spinner) actionbarLayout.findViewById(R.id.action_bar_spinner);
//setAdapter能够根据具体状况, 此处没必要深究.
mActionbarSpinne.setAdapter(new SimpleAdapter(this,
        getDrawerItems(true), R.layout.drawer_item, new String[] {
                "drawer_img", "drawer_title" }, new int[] {
                R.id.drawer_img, R.id.drawer_title }));
mActionbarSpinne.setOnItemSelectedListener(new SpinnerItemSelectedListener());
//使自定义的普通View能在title栏显示, actionBar.setCustomView能起做用.
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setCustomView(actionbarLayout);

而后Spinner Item选中时, 加个Listener

/**
 * 监听action_bar的spinner item选择事件
 */
private class SpinnerItemSelectedListener implements OnItemSelectedListener {
    @Override
    public void onItemSelected(AdapterView<?> arg0, View view, int position,
            long arg3) {
        selectItem(view, position, MESSAGE_SPINNER_ITEM);
    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {}
}

Listener的selectItem()细节以下

if (messageId == MESSAGE_SPINNER_ITEM) {
            if (position != 0) {
                TextView title = (TextView) view.findViewById(R.id.drawer_title);
                String cityName = title.getText().toString();
                this.cityInput.setText(cityName);
            }
        }

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至此, 能够根据具体状况在Action bar上面自定义View