我試圖動態更改線性佈局或任何其他窗口小部件寬度或高度,但引發異常。動態更改Android上的線性佈局寬度或高度
我的佈局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/abc"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ghghjkgj ghjg hjgj ghj g hjgjgh jhg "
/>
</LinearLayout>
和我的活動是:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout ll = (LinearLayout)findViewById(R.id.abc);
ll.setLayoutParams(new LinearLayout.LayoutParams(30,60));
}
投擲以下異常:
E/AndroidRuntime(16052): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
E/AndroidRuntime(16052): at android.widget.FrameLayout.onLayout(FrameLayout.java:288)
E/AndroidRuntime(16052): at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
E/AndroidRuntime(16052): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
E/AndroidRuntime(16052): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
E/AndroidRuntime(16052): at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(16052): at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052): at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
E/AndroidRuntime(16052): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
E/AndroidRuntime(16052): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(16052): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(16052): at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(16052): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(16052): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(16052): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(16052): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(16052): at dalvik.system.NativeStart.main(Native Method)
所以,我怎麼能更改尺寸動態?
非常感謝.......它對我非常有幫助,但我如何識別linearlayout的父項。 – Pratique 2010-10-04 11:03:28