无法在 android studio 3.4.1 中解析符号 'NotificationCompat '

Question

我是 Android 的新手，收到错误消息："NotificationCompat cannot be resolved to a type"

MinSDK=18, TargetSDK=28, Android Gradle 插件版本=3.4.1, gradle 版本=5.1.1 如何解决这个错误帮助我

我的 gradle 文件如下

dependencies {
    implementation "com.android.support:support-core-utils:28.0.0"
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:2.0.0-alpha5'
    testImplementation 'junit:junit:4.13-beta-2'
   'com.android.support.test:runner:1.0.2'
    implementation "com.android.support:support-core-utils:28.0.0"
    implementation 'com.google.code.gson:gson:2.8.5'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:support-compat:28.0.0'
}

有notificationCompat错误的代码

  protected android.support.v7.app.NotificationCompat.Action getStopAction() {
        Intent intent = new Intent(WIFI_AP_ACTION_STOP);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        return new android.support.v7.app.NotificationCompat.Action.Builder(android.R.drawable.ic_menu_close_clear_cancel, "Stop", pendingIntent).build();

Answer 1

尽管您的构建 gradle 中有 implementation 'com.android.support:appcompat-v7:28.0.0'，但 class 路径是 android.support.v4.app.NotificationCompat.Action（不是 v7.app...）

你也可以确认HERE（注意包路径上的V4）

所以，只需将您的方法更新为：

protected android.support.v4.app.NotificationCompat.Action getStopAction() { ... }

Answer 2

对于 sdk 28，您需要使用： java.lang.Object ↳ androidx.core.app.NotificationCompat

无法在 android studio 3.4.1 中解析符号 'NotificationCompat '

Cannot resolve symbol 'NotificationCompat ' in android studio 3.4.1

notifications

android

android-notifications

android-support-library