我试图动态更改线性布局或任何其他窗口小部件宽度或高度，但引发异常。动态更改Android上的线性布局宽度或高度

我的布局：

android:id="@+id/abc"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="ghghjkgj ghjg hjgj ghj g hjgjgh jhg "

/>

和我的活动是：

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));

}

投掷以下异常：

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，我怎么能更改尺寸动态？

2010-09-29

Pratique