小编Ala*_*ega的帖子

在Android Studio中,我正在为minSdkVersion 19开发,当我将其更改为21时,我的所有布局中都出现以下错误:

java.lang.ClassNotFoundException: android.support.v4.view.TintableBackgroundView
    at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:181)
    at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:56)
    at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:119)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.jetbrains.android.uipreview.ModuleClassLoader.loadClass(ModuleClassLoader.java:214)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
    at com.android.tools.idea.rendering.RenderClassLoader.defineClassAndPackage(RenderClassLoader.java:177)
    at com.android.tools.idea.rendering.RenderClassLoader.loadClassFromJar(RenderClassLoader.java:92)
    at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:171)
    at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:56)
    at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:119)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.jetbrains.android.uipreview.ModuleClassLoader.loadClass(ModuleClassLoader.java:214)
    at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:500)
    at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:254)
    at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:215)
    at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadClass(LayoutlibCallbackImpl.java:218)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:336)
    at android.view.BridgeInflater.onCreateView(BridgeInflater.java:155)
    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:720)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:788)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:225)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:863)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
    at com.android.layoutlib.bridge.bars.CustomBar.<init>(CustomBar.java:90)
    at com.android.layoutlib.bridge.bars.NavigationBar.<init>(NavigationBar.java:52)
    at com.android.layoutlib.bridge.bars.NavigationBar.<init>(NavigationBar.java:46)
    at com.android.layoutlib.bridge.impl.Layout.createNavBar(Layout.java:325)
    at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:151)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:288) …

好的，所以我到处都看了，找不到答案。我已经在Android应用程序中实现了推送通知，并且在该应用程序处于运行状态（前景或后台）时，一切正常，但是，如果我关闭该应用程序，则我将停止接收通知。这是我发送通知的PHP代码。

public static function sendNotification($token){
    $url = 'https://fcm.googleapis.com/fcm/send';
    $fields = array(
        'notification' => array("title" => "Test","body" => "Test Message","icon" => "default","sound" => "default"),
        "data" => "test message",
        'to' => $token
    );
    $headers = array(
        'Authorization:key = AIzaSyAKHM3MoMACjmeVK46TDg8-rTj1KoVjzWs',
        'Content-Type: application/json'
    );
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_POST,true);
    curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,0);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);                           
    curl_setopt($ch,CURLOPT_POSTFIELDS,json_encode($fields));
    $result = curl_exec($ch);
    if($result === FALSE) {
        throw new errorSendingNotification();
    }
    curl_close($ch);
    // Result returns this
    // {"multicast_id":8978533958735781479,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1468627796530714%7c0e4bee7c0e4bee"}]}
    return $result;
}