在 Android 中膨胀自定义 TextView 时出错答案

【问题标题】：Error inflating custom TextView in Android在 Android 中膨胀自定义 TextView 时出错
【发布时间】：2014-01-16 09:03:35
【问题描述】：

我已经搜索了几个小时来寻找解决方案，但找不到。我正在尝试创建一个自定义 TextView，如果它是数字，它会为这些值设置动画。但是，即使在它开始第一个值之前，我也会遇到异常。我希望你能帮忙。

这是我的代码：

import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.TextView;

public class AnimatedValueTextView extends TextView {
    private static final int DURATION = 900;
    private float actualValue;
    private ValueAnimator animator;

    public AnimatedValueTextView(Context context) {
        super(context);
        init();
    }

    public AnimatedValueTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public AnimatedValueTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }


    private void init()
    {
        actualValue = 0;
        animator = new ValueAnimator();

        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                setText(valueAnimator.getAnimatedValue().toString());
                actualValue = (Float)valueAnimator.getAnimatedValue();
            }
        });

        animator.setDuration(DURATION);
    }

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);

        boolean validValue = true;
        float newValue = 0;

        try {
            newValue = Float.parseFloat(this.getText().toString());
        }

        catch (Exception e)
        {
            validValue = false;
        }

        if(validValue)
        {
            if(animator == null)
            {
                init();
            }

            animator.cancel();
            animator.setFloatValues(actualValue, newValue);
            animator.start();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

还有我的 XML

<com.---.-------.AnimatedValueTextView
            android:id="@+id/actualPressure"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            style="@style/FunkyTextBig"
            android:paddingLeft="2dp"
            android:text="1043"/>

还有 LogCat

01-16 09:55:14.954    5085-5085/com.---.----- E/AndroidRuntime﹕ FATAL EXCEPTION: main
    android.view.InflateException: Binary XML file line #18: Error inflating class com.---.-----.AnimatedValueTextView
            at android.view.LayoutInflater.createView(LayoutInflater.java:620)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
            at com.---.-----.ForecastFragment.onCreateView(ForecastFragment.java:70)
            at android.app.Fragment.performCreateView(Fragment.java:1695)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
            at android.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
            at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:474)
            at android.support.v13.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:167)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
            at android.view.View.measure(View.java:15848)
            at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
            at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
            at android.view.Choreographer.doCallbacks(Choreographer.java:562)
            at android.view.Choreographer.doFrame(Choreographer.java:532)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Constructor.constructNative(Native Method)
            at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
            at android.view.LayoutInflater.createView(LayoutInflater.java:594)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
            at com.---.-----.ForecastFragment.onCreateView(ForecastFragment.java:70)
            at android.app.Fragment.performCreateView(Fragment.java:1695)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
            at android.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
            at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:474)
            at android.support.v13.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:167)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
            at android.view.View.measure(View.java:15848)
            at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
            at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189)
            at android.view.View.measure(View.java:15848)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
            at android.view.Choreographer.doCallbacks(Choreographer.java:562)
            at android.view.Choreographer.doFrame(Choreographer.java:532)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
            at android.os.Handler.handleCallback(Handler.java:730)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.StackOverflowError
            at java.lang.RealToString.floatToString(RealToString.java:126)
            at java.lang.Float.toString(Float.java:322)
            at java.lang.Float.toString(Float.java:310)

以及使用的样式：

<style name="FunkyTextBig" parent="@android:style/TextAppearance">
        <item name="android:textColor">#eaf1f7</item>
        <item name="android:textStyle">bold</item>
        <item name="android:shadowColor">#000000</item>
        <item name="android:shadowRadius">13</item>
        <item name="android:textSize">45sp</item>
        <item name="android:shadowDx">0</item>
        <item name="android:shadowDy">0</item>
    </style>

    <style name="FunkyTextMedium" parent="@style/FunkyTextBig">
        <item name="android:textSize">22sp</item>
    </style>

【问题讨论】：

哪个版本的android有你正在测试它的设备？
它是 4.3 版本，我正在为 4.0.4 及更高版本开发
你能发布一下样式吗？
你的 xml 中第 18 行有什么内容？
您要更改此 textView 中的文本吗？当我在 TextView 具有 onTextChanged 时更改文本时，我经常会遇到 stackoverflow。您应该在更改文本之前禁用它，然后再启用它以防止堆栈溢出。

标签： android android-custom-view android-inflate

【解决方案1】：

另一个不错的解决方案是不覆盖 onTextChanged 方法，并且有两个方法 setText：一个会触发动画的公共方法，一个会在不设置动画的情况下更改值的私有方法：

private void init(){
    actualValue = 0;
    animator = new ValueAnimator();
    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            setTextInternal(valueAnimator.getAnimatedValue().toString());
            actualValue = (Float)valueAnimator.getAnimatedValue();
        }
    });

    animator.setDuration(DURATION);
}


public void setNumber(float newValue){
    animator.cancel();
    animator.setFloatValues(actualValue, newValue);
    animator.start();
}

public void setText(String txt){
    try {
        float newValue = Float.parseFloat(txt);
        setNumber(newValue);
    }catch (Exception e){
        super.setText(txt);
    }
}


private void setTextInternal(String txt){
    super.setText(txt);
}

【讨论】：

谢谢。我一定会尝试你的解决方案

【解决方案2】：

您收到此错误是因为您正在循环设置文本。

1) 调用onTextChanged保存初始值

2) onTextChanged 中的代码开始动画，每一步都会调用 setText（它会自动调用 onTextChanged）

3) 这个onTextChanged会取消动画并重新开始。

解决方法是通过flag控制onTextChanged的调用，给Animation添加另外一个监听器：

animator.addListener(new Animator.AnimatorListener(){
    public void onAnimationStart(Animator animation) {
        isAnimating = true;
    }
    public void onAnimationEnd(Animator animation) {
        isAnimating = false;
    }
    public void onAnimationRepeat(Animator animation) {}
    public void onAnimationCancel(Animator animation) {}
})


@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
    if (isAnimating) return;
    super.onTextChanged(text, start, lengthBefore, lengthAfter);

    ...
}

【讨论】：

动画结束后你仍然需要重新设置isAnimating，否则它只会工作一次。

【解决方案3】：

在您的 onTextChanged 方法中，您将启动 animator，然后再次调用 setText()，这又会再次触发 onTextChanged，这将永远持续下去，直到 VM 足够。

如果您将 onTextChanged 方法更改如下，它会起作用：

@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
    super.onTextChanged(text, start, lengthBefore, lengthAfter);
    if (animator != null && (animator.isStarted() || animator.isRunning()))
        return;

    // rest as above

【讨论】：

有没有办法覆盖 setText 以便我可以在 OnTextChanged 的 sted 中使用它？