作者：mobiledu2502926167 | 来源：互联网 | 2023-09-15 04:59
我没有使用 XML 文件来设置波纹可绘制的状态，而是使用 javanew RippleDrawable(color, backgroundDrawable, null) 构造函数，因为我在适配器中使用它，其中每个项目都有自己的颜色。该代码在棒棒糖后设备上按预期工作，但即使我添加了 SDK_INT 检查，它也会在棒棒糖前设备上崩溃并出现以下错误
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
holder.rootView.setBackground(getBackgroundDrawable(ColorConverter.lightenColor(Color.parseColor(item.getTextColor()), 0.6f), background));
}
getBackgroundDrawable()
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private static RippleDrawable getBackgroundDrawable(int pressedColor, Drawable backgroundDrawable) {
return new RippleDrawable(getPressedState(pressedColor), backgroundDrawable, null);
}
getPressedState()
private static ColorStateList getPressedState(int pressedColor) {
return new ColorStateList(new int[][]{new int[]{}}, new int[]{pressedColor});
}
错误堆栈跟踪
E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method com.test.app.adapter.util.DashboardButtonsAdapter.getBackgroundDrawable
12-11 18:40:07.745 14717-14717/com.test.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.app, PID: 14717
java.lang.VerifyError: com/test/app/adapter/util/DashboardButtonsAdapter
at com.test.app.fragment.dashboard.DashboardPageFragment.onCreateView(DashboardPageFragment.java:71)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
at androidx.fragment.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:168)
at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244)
at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
at android.view.View.measure(View.java:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:733)
at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:805)
at android.view.View.measure(View.java:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
at android.view.View.measure(View.java:16504)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
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:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
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:16504)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
at android.view.View.measure(View.java:16504)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRo
回答
原因#getBackgroundDrawable是返回一个RippleDrawable. 因为它只有 21+ 可用，因此出现验证错误，因为 android 找不到它的独立方法和方法签名中的返回类型。要在运行下面的代码时验证这一点，您将不会收到相同的错误，因为对整个代码块进行了版本检查。
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
RippleDrawable rippleDrawable= new RippleDrawable(getPressedState(Color.GREEN), null, null);
textView.setBackground(rippleDrawable);
}
您问题的最简单解决方案是将返回类型更改#getBackgroundDrawable为Drawable。
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private static Drawable getBackgroundDrawable(int pressedColor, Drawable backgroundDrawable) {
return new RippleDrawable(getPressedState(pressedColor), backgroundDrawable, null);
}
java.lang.VerifyError意味着您的代码指的是 android 找不到的东西。将返回类型更改为Drawable方法签名对 API-19 有效。如果您在没有版本检查的情况下运行此代码，那么您将得到，ClassNotFoundException因为现在正在执行实际的方法主体。看看这个线程。
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