LinearLayout$LayoutParams 无法转换为 android.widget.FrameLayout$LayoutParams

解释和解决方法在底部。

我正在开发一个滑块布局动画，动画工作正常，但当所有进程结束时，它们会出现下一个异常。

I guess RelativeLayout家长有事情要做，但我不知道如何解决。

09-06 11:24:58.952: E/Trace(30884): error opening trace file: No such file or directory (2)
09-06 11:25:09.113: E/AndroidRuntime(30884): FATAL EXCEPTION: main
09-06 11:25:09.113: E/AndroidRuntime(30884): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.FrameLayout$LayoutParams
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:311)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.View.measure(View.java:15264)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.View.measure(View.java:15264)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.View.measure(View.java:15264)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2161)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.View.measure(View.java:15264)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2129)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1240)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1433)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1125)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4607)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:747)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.Choreographer.doCallbacks(Choreographer.java:567)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.Choreographer.doFrame(Choreographer.java:536)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:733)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.os.Handler.handleCallback(Handler.java:615)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.os.Looper.loop(Looper.java:153)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at android.app.ActivityThread.main(ActivityThread.java:5086)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at java.lang.reflect.Method.invokeNative(Native Method)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at java.lang.reflect.Method.invoke(Method.java:511)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
09-06 11:25:09.113: E/AndroidRuntime(30884):    at dalvik.system.NativeStart.main(Native Method)

活动主页.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/leftView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#cad000"
        android:orientation="vertical" >
    </LinearLayout>

    <LinearLayout
        android:id="@+id/mainView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#876000"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="#cecece"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/btnSlide"
                style="@style/btn1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="X" />
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

Activity

public class HomeActivity extends Activity implements OnClickListener {

    UserStorage userStorage = new UserStorage();

    private Button btnSlide;
    private LinearLayout mainView, leftView;
    private SliderAnimation slideAnimation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        this.leftView = (LinearLayout) findViewById(R.id.leftView);
        this.mainView = (LinearLayout) findViewById(R.id.mainView);

        this.btnSlide = (Button) findViewById(R.id.btnSlide);
        this.btnSlide.setOnClickListener(this);

        this.slideAnimation = new SliderAnimation(this);

        this.slideAnimation.initializeFilterAnimations(this.mainView, this.leftView);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

        case R.id.btnSlide:

            this.slideAnimation.toggleLeftSliding();

            break;
        }
    }
}

动画监听器

public class SliderAnimation implements AnimationListener {

    private Context context;

    private LinearLayout mainView, leftView;

    private Animation mainSlideIn, mainSlideOut;

    private boolean leftAnimated, rightAnimated = false;

    private int deviceWidth;

    public SliderAnimation(Context context) {

        this.context = context;

        DisplayMetrics displayMetrics = context.getResources()
                .getDisplayMetrics();

        this.deviceWidth = displayMetrics.widthPixels;
    }

    public void initializeFilterAnimations(LinearLayout mainView,
            LinearLayout leftView) {

        this.mainView = mainView;
        this.leftView = leftView;

        this.mainSlideIn = AnimationUtils.loadAnimation(context,
                R.anim.main_slide_in);
        this.mainSlideIn.setAnimationListener(this);

        this.mainSlideOut = AnimationUtils.loadAnimation(context,
                R.anim.main_slide_out);
        this.mainSlideOut.setAnimationListener(this);
    }

    public void toggleLeftSliding() {

        if (!this.leftAnimated) {

            this.mainView.startAnimation(this.mainSlideIn);
        } else {

            this.mainView.startAnimation(this.mainSlideOut);
        }
    }

    @Override
    public void onAnimationEnd(Animation animation) {

        if (!this.leftAnimated) {

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    (this.deviceWidth * 20) / 100, this.mainView.getHeight());

            params.leftMargin = (this.deviceWidth * 80) / 100;

            this.mainView.setLayoutParams(params);

            this.leftAnimated = true;
        } else {

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    this.deviceWidth, this.mainView.getHeight());

            params.leftMargin = 0;

            this.mainView.setLayoutParams(params);

            this.leftAnimated = false;
        }
    }

    @Override
    public void onAnimationRepeat(Animation animation) {
    }

    @Override
    public void onAnimationStart(Animation animation) {
    }
}

先感谢您。

解释及解决方案

我们必须知道视图的父 ViewGroup 容器，因为出于测量目的，视图填充了其父 LayoutParams。

如果我们不知道通过简单的浏览 xml 哪个是 View 的父 ViewGroup，我们总是可以从 View 实例中使用 .getParent() 方法获取它的引用。

我遇到了类似的问题，我发现答案在这里 https://stackoverflow.com/a/10046252/62921。基本上，您应该根据您的情况选择 LayoutParamsnew LinearLayout.LayoutParams应该new RelativeLayout.LayoutParams.