[英]Change the size of a fragment with a button
当我单击mapview片段内的按钮时,我正在尝试更改“ MapView”和“ InfoContent”的权重。 mapView Fragment在PlaceholderFragment2 Java类中定义。 第一次单击应将权重更改为新值,而第二次单击应将原值恢复。
XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>
<FrameLayout
android:id="@+id/TitleBar"
android:layout_width="fill_parent"
android:layout_height="50dp"
>
</FrameLayout>
<FrameLayout
android:id="@+id/MapView"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1">
</FrameLayout>
<FrameLayout
android:id="@+id/InfoTitleBar"
android:layout_width="fill_parent"
android:layout_height="170dp"
>
</FrameLayout>
<FrameLayout
android:id="@+id/InfoContent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="0"
>
</FrameLayout></LinearLayout>
MainActivity.Java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
PlaceholderFragment frg=new PlaceholderFragment();
PlaceholderFragment2 frg2=new PlaceholderFragment2();
PlaceholderFragment3 frg3=new PlaceholderFragment3();
PlaceholderFragment4 frg4=new PlaceholderFragment4();
FragmentManager manager=getFragmentManager();
FragmentTransaction transaction=manager.beginTransaction();
transaction.add(R.id.TitleBar, frg, "Frag_Top_tag");
transaction.add(R.id.MapView, frg2, "Frag_Middle_tag");
transaction.add(R.id.InfoTitleBar, frg3, "Frag_Bottom_tag");
transaction.add(R.id.InfoContent, frg4, "Frag_Content_tag");
transaction.commit();
}
还有PlaceHolderFragment2.java
public static class PlaceholderFragment2 extends Fragment {
public PlaceholderFragment2() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.mapview, container,
false);
final Button button =
(Button) rootView.findViewById(R.id.zoomMap);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
buttonClicked(v);
}
});
return rootView;
}
我解决了这个问题,将片段放置在线性布局中 ,然后在创建对象的主要活动中,当我单击更改线性布局的权重大小时,cos既不需要也不需要片段事务 。
主要活动
private Button button;
private LinearLayout layoutListView;
private LinearLayout.LayoutParams lpListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_container);
button = (Button) findViewById(R.id.button);
layoutListView = (LinearLayout) findViewById(R.id.listTreeView);
lpListView = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT);
lpListView.weight = 20;
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (lpListView.weight == 0) {
lpListView.weight = 20;
} else {
lpListView.weight = 0;
}
layoutListView.setLayoutParams(lpListView);
}
});
}
}
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="100"
android:orientation="horizontal"
android:weightSum="100" >
<LinearLayout
android:id="@+id/listTreeView"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="20"
android:orientation="horizontal" >
<fragment
android:id="@+id/fraglistView"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.ListTreeView" />
</LinearLayout>
<LinearLayout
android:id="@+id/fragbutton"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="80"
android:background="#F000" >
<fragment
android:id="@+id/fraglistRight"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.ListViewRight" />
</LinearLayout>
</LinearLayout>
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