小编Pra*_*que的帖子

我试图动态地改变线性布局或任何其他小部件的宽度或高度,但抛出异常.

我的布局是:

<?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>

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));
    }

抛出以下异常:

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) …