Android appcompat v7 21库中的FadingActionBar错误

Question

我今天第一次尝试使用v7 21库.

我也在我的应用程序中使用FadingActionBar库.该链接到库 https://github.com/ManuelPeinado/FadingActionBar

在我习惯使用v7 21库之前,应用程序一直运行良好.但现在我收到了这个错误.

Caused by: java.lang.NullPointerException
            at com.manuelpeinado.fadingactionbar.FadingActionBarHelper.setActionBarBackgroundDrawable(FadingActionBarHelper.java:48)
            at com.manuelpeinado.fadingactionbar.FadingActionBarHelperBase.initActionBar(FadingActionBarHelperBase.java:173)
            at com.manuelpeinado.fadingactionbar.FadingActionBarHelper.initActionBar(FadingActionBarHelper.java:31)
            at olkunmustafa.example.parallax.medyasef.com.parallaxanimationexample.MyActivity.onCreate(MyActivity.java:23)
            at android.app.Activity.performCreate(Activity.java:5231)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            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:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

如果我将appcompat从v21更改为v20,一切都已修复.但是我想用v21.

这是我的values/style.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light">
        <item name="android:windowActionBarOverlay">true</item>
    </style>

</resources>

MyActivity.java

public class MyActivity extends ActionBarActivity {

    @Override
    protected void onCreate( Bundle savedInstanceState ) {
        super.onCreate( savedInstanceState );

        FadingActionBarHelper helper = new FadingActionBarHelper()
                .actionBarBackground( R.color.green_ms )
                .headerLayout( R.layout.header )
                .contentLayout( R.layout.activity_my );
        setContentView( helper.createView( this ) );
        helper.initActionBar( this );
    }
}

的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.0.1"

    defaultConfig {
        applicationId "olkunmustafa.example.parallax.medyasef.com.parallaxanimationexample"
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.+'
    compile 'com.github.manuelpeinado.fadingactionbar:fadingactionbar:3.1.2'
}

抱歉坏英语.谢谢你的帮助

Answer 1

此库与新的AppCompat不兼容.Github页面上已经打开了一个问题:Fading ActionBar问题.开发人员意识到了这个问题,但与此同时,他发布了一个要点,说明如何使用新的Toolbar小部件实现此效果:工具栏淡化效果