使用LinearLayout.LayoutParams时抛出ClassCastException [英] ClassCastException when using LinearLayout.LayoutParams
本文介绍了使用LinearLayout.LayoutParams时抛出ClassCastException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是个例外：
07-20 19:52:14.193: E/AndroidRuntime(3908): FATAL EXCEPTION: main
07-20 19:52:14.193: E/AndroidRuntime(3908): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.LinearLayout.measureVertical(LinearLayout.java:634)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1249)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2265)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2628)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.os.Looper.loop(Looper.java:137)
07-20 19:52:14.193: E/AndroidRuntime(3908): at android.app.ActivityThread.main(ActivityThread.java:4507)
07-20 19:52:14.193: E/AndroidRuntime(3908): at java.lang.reflect.Method.invokeNative(Native Method)
07-20 19:52:14.193: E/AndroidRuntime(3908): at java.lang.reflect.Method.invoke(Method.java:511)
07-20 19:52:14.193: E/AndroidRuntime(3908): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
07-20 19:52:14.193: E/AndroidRuntime(3908): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
07-20 19:52:14.193: E/AndroidRuntime(3908): at dalvik.system.NativeStart.main(Native Method)
我看不到的地方抛出异常，所以我不能弄清楚相当不错的线路。我不知道这是在这行：
I can't see a line where the exception is thrown so I can't figure it out quite good. I do know it is in these lines:
public class TodayFragment extends Fragment {
ListView listView;
String[] urls;
ActionBar mActionBar;
Spinner spinner1;
public TodayFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LinearLayout linear = new LinearLayout(getActivity());
linear.setOrientation(LinearLayout.VERTICAL);
spinner1 = new Spinner(getActivity());
spinner1.setLayoutParams(new LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linear.addView(spinner1);
listView = new ListView(getActivity());
spinner1.setLayoutParams(new LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linear.addView(listView);
new ParseHTML().execute();
return linear;
}
}
我使用的片段是android.support.v4.app.Fragment。是什么原因造成的？
The fragment I'm using is android.support.v4.app.Fragment. What causes this?
推荐答案
您对的LayoutParams import语句可能是进口ViewGroup.LayoutParams。尝试明确使用LinearLayout.LayoutParams（...）：
Your import statement for LayoutParams is probably importing ViewGroup.LayoutParams. Try explicitly using LinearLayout.LayoutParams(...):
spinner1.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
这篇关于使用LinearLayout.LayoutParams时抛出ClassCastException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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