Android(安卓)ViewStub 布局延迟加载

ViewStub本身只占一点内存空间

在调用inflate后才加载layout属性所指向的layout，以替换当前ViewStub所占的位置

在某些需要选择显示何种布局时，就可以使用ViewStub来延迟加载

注意：inflate只能有一次

layout: activity_view_stub.xml

<RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:id="@+id/btn_show"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="show"        android:text="显示viewstub指向的layout"/>    <Button        android:id="@+id/btn_hide"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_toRightOf="@id/btn_show"        android:onClick="hide"        android:text="隐藏viewstub指向的layout"/>    <ViewStub        android:id="@+id/vs_stub"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:layout_below="@id/btn_show"        android:layout="@layout/rorate_bitmap"/></RelativeLayout>

public class ViewStubActivity extends Activity {      ViewStub mViewStub;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_view_stub);        mViewStub = (ViewStub) findViewById(R.id.vs_stub);    }    View inflate;    public void show(View view) {        if (inflate == null)            inflate = mViewStub.inflate();        else            inflate.setVisibility(View.VISIBLE);    }    public void hide(View view) {        if (inflate == null)            inflate = mViewStub.inflate();        inflate.setVisibility(View.GONE);    }}

更多相关文章

随机推荐