相关疑难解决方法(0)

我想在代码中动态创建一个纹波.

码:

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      buyButton.setBackground(getPressedColorRippleDrawable(primaryColor, darkerVariant));
}

public static RippleDrawable getPressedColorRippleDrawable(int color, int darkerVariant) {
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        ColorStateList colorStateList = new ColorStateList(
                new int[][]
                        {new int[]{}},
                new int[]
                        {darkerVariant}
        );
        return new RippleDrawable(colorStateList, new ColorDrawable(color), null);
    }
    return null;
}

这适用于棒棒糖,但会使我的GNEX(4.3)上的应用程序崩溃.
错误:

找不到类'android.graphics.drawable.RippleDrawable',从方法片段引用.ProductDetailFragment.getPressedColorRippleDrawable

07-17 12:57:45.757 30992-30992/com.comizzo.ginsonline E/AndroidRuntime:致命例外:主要

java.lang.VerifyError:fragments/ProductDetailFragment

但RippleDrawable从未在Gnex上使用,因为代码未被执行.

我怎样才能解决这个问题 ？

我正在使用第三方库,有一种方法使用DrawableCompat.setTintMode(drawable, PorterDuff.Mode.SRC_IN);.当我在Android 5.0 +中测试我的应用程序时,没有问题并且运行良好.但是当它涉及到android 4.4.4时,它引发了一个异常:

    05-09 13:15:15.030 26447-26447/com.wizchen.athit E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.wizchen.athit, PID: 26447
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wizchen.athit/com.wizchen.athit.view.activity.MainActivity}: java.lang.NullPointerException
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2271)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2320)
   at android.app.ActivityThread.access$800(ActivityThread.java:138)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:136)
   at android.app.ActivityThread.main(ActivityThread.java:5117)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:515)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
   at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
   at android.support.v4.graphics.drawable.DrawableWrapperDonut.setCompatTintMode(DrawableWrapperDonut.java:278)
   at android.support.v4.graphics.drawable.DrawableCompatBase.setTintMode(DrawableCompatBase.java:48)
   at android.support.v4.graphics.drawable.DrawableCompat$BaseDrawableImpl.setTintMode(DrawableCompat.java:99)
   at android.support.v4.graphics.drawable.DrawableCompat.setTintMode(DrawableCompat.java:400)
   at com.wizchen.athit.lib.AppThemeEngine.util.TintHelper.createTintedDrawable(TintHelper.java:359)
   at com.wizchen.athit.lib.AppThemeEngine.viewprocessors.ToolbarProcessor.process(ToolbarProcessor.java:117)
   at com.wizchen.athit.lib.AppThemeEngine.viewprocessors.ToolbarProcessor.process(ToolbarProcessor.java:44)
   at com.wizchen.athit.lib.AppThemeEngine.ATE.postApply(ATE.java:209)
   at com.wizchen.athit.lib.AppThemeEngine.ATEActivity.onStart(ATEActivity.java:60)
   at com.wizchen.athit.view.activity.MainActivity.onStart(MainActivity.java:68)
   at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1183)
   at android.app.Activity.performStart(Activity.java:5359)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2244) …

我正在使用自定义波纹 drawable

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:exitFadeDuration="@android:integer/config_shortAnimTime"
    android:color="@android:color/white">

   <item android:id="@android:id/mask">
        <shape android:shape="rectangle" >
            <solid android:color="@android:color/white" />
        </shape>
   </item>


</ripple>

但它崩溃了API 19上的应用程序

android.content.res.Resources$NotFoundException: File res / drawable /
    ripple_effect_square2.xml from drawable resource ID #0x7f02017d
at android.content.res.Resources.loadDrawable(Resources.java:2101)
at android.content.res.Resources.getDrawable(Resources.java:700)
at android.view.View.setBackgroundResource(View.java:15303)

Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line # 2: invalid drawable tag ripple
at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java: 933)
at android.graphics.drawable.Drawable.createFromXml(Drawable.java: 877)
at android.content.res.Resources.loadDrawable(Resources.java: 2097)
at android.content.res.Resources.getDrawable(Resources.java: 700) 
at android.view.View.setBackgroundResource(View.java: 15303) 

我该怎么做才能防止崩溃？