如何对按钮使用波纹效果

Question

I'm using the eclipse. I want to use ripple effect .

I have appcompat-v7:21.0.0.

drawable/test.xml

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="@android:color/white"> <!-- ripple color -->

    <item android:drawable="@android:color/holo_blue_bright"/> <!-- normal color -->

</ripple>

activity_main.xml

<LinearLayout 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"
    tools:context="com.example.ex48_materialdesign.MainActivity" 
    android:orientation="vertical">


    <Button 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="test"
        android:background="@drawable/test"
        />

</LinearLayout>

But I get these errors :

> 03-12 15:12:11.441: E/AndroidRuntime(4828): FATAL EXCEPTION: main
> 03-12 15:12:11.441: E/AndroidRuntime(4828):
> java.lang.RuntimeException: Unable to start activity
> ComponentInfo{com.example.ex48_materialdesign/com.example.ex48_materialdesign.MainActivity}:
> android.view.InflateException: Binary XML file line #13: Error
> inflating class android.widget.Button 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.app.ActivityThread.access$700(ActivityThread.java:152) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.os.Handler.dispatchMessage(Handler.java:99) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.os.Looper.loop(Looper.java:137) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.app.ActivityThread.main(ActivityThread.java:5328) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> java.lang.reflect.Method.invokeNative(Native Method) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> java.lang.reflect.Method.invoke(Method.java:511) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> dalvik.system.NativeStart.main(Native Method) 03-12 15:12:11.441:
> E/AndroidRuntime(4828): Caused by: android.view.InflateException:
> Binary XML file line #13: Error inflating class android.widget.Button
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.view.LayoutInflater.createView(LayoutInflater.java:619) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.view.LayoutInflater.onCreateView(LayoutInflater.java:666)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:691)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.view.LayoutInflater.rInflate(LayoutInflater.java:752) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.view.LayoutInflater.inflate(LayoutInflater.java:495) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.view.LayoutInflater.inflate(LayoutInflater.java:397) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.view.LayoutInflater.inflate(LayoutInflater.java:353) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> com.example.ex48_materialdesign.MainActivity.onCreate(MainActivity.java:13)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.app.Activity.performCreate(Activity.java:5250) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   ... 11 more 03-12
> 15:12:11.441: E/AndroidRuntime(4828): Caused by:
> java.lang.reflect.InvocationTargetException 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> java.lang.reflect.Constructor.constructNative(Native Method) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> java.lang.reflect.Constructor.newInstance(Constructor.java:417) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.view.LayoutInflater.createView(LayoutInflater.java:593) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     ... 24 more 03-12 15:12:11.441:
> E/AndroidRuntime(4828): Caused by:
> android.content.res.Resources$NotFoundException: File
> res/drawable/test.xml from drawable resource ID #0x7f020034 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.content.res.Resources.loadDrawable(Resources.java:2842) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.content.res.TypedArray.getDrawable(TypedArray.java:602) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     at
> android.view.View.<init>(View.java:3460) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.widget.TextView.<init>(TextView.java:791) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.widget.Button.<init>(Button.java:107) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.widget.Button.<init>(Button.java:103) 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   ... 27 more 03-12 15:12:11.441:
> E/AndroidRuntime(4828): Caused by:
> org.xmlpull.v1.XmlPullParserException: Binary XML file line #1:
> invalid drawable tag ripple 03-12 15:12:11.441:
> E/AndroidRuntime(4828):   at
> android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:917)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.graphics.drawable.Drawable.createFromXml(Drawable.java:858)
> 03-12 15:12:11.441: E/AndroidRuntime(4828):   at
> android.content.res.Resources.loadDrawable(Resources.java:2839) 03-12
> 15:12:11.441: E/AndroidRuntime(4828):     ... 32 more

Answer 1

is it possible to use tag for lower than 5.0+ ?

You cannot use <ripple> in a drawable resource prior to Android 5.0, as it did not exist back then. Backports, like appcompat-v7 , can backport Java code and styles, but they cannot cause earlier versions of Android to recognize new resource structures.

Also, RippleDrawable exists only in API Level 21 and does not appear to be in the appcompat-v7 backport.

You are welcome to try this RippleDrawable backport , though you probably have to use it from Java code, not from a resource.