android通知AndroidRuntime:致命异常

我想做一个小的通知程序，我得到了这个错误 请任何人都可以帮助我的项目需要它

11-19 23:42:40.297 5971-5971/com.example.codeiv.ewtest E/AndroidRuntime: FATAL EXCEPTION: main
                                                                     Process: com.example.codeiv.ewtest, PID: 5971
                                                                     java.lang.IllegalStateException: Could not execute method for android:onClick
                                                                         at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
                                                                         at android.view.View.performClick(View.java:5198)
                                                                         at android.view.View$PerformClick.run(View.java:21147)
                                                                         at android.os.Handler.handleCallback(Handler.java:739)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                         at android.os.Looper.loop(Looper.java:148)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                      Caused by: java.lang.reflect.InvocationTargetException
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
                                                                         at android.view.View.performClick(View.java:5198) 
                                                                         at android.view.View$PerformClick.run(View.java:21147) 
                                                                         at android.os.Handler.handleCallback(Handler.java:739) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                         at android.os.Looper.loop(Looper.java:148) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
                                                                      Caused by: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=com.example.codeiv.ewtest/0x1090085 vibrate=null sound=null defaults=0x0 flags=0x0 color=0x00000000 vis=PRIVATE)
                                                                         at android.app.NotificationManager.notify(NotificationManager.java:222)
                                                                         at android.app.NotificationManager.notify(NotificationManager.java:194)
                                                                         at com.example.codeiv.ewtest.main_menu.test1(main_menu.java:54)
                                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                                         at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
                                                                         at android.view.View.performClick(View.java:5198) 
                                                                         at android.view.View$PerformClick.run(View.java:21147) 
                                                                         at android.os.Handler.handleCallback(Handler.java:739) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                         at android.os.Looper.loop(Looper.java:148) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

11-19 23:42:42.658 5971-5971/com.example.codeiv.ewtest I/Process：发送信号。PID:5971信号：9

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_menu);
}

public void inf(View view) {
    Intent intent = new Intent(this , nfo.class);
    startActivity(intent);
}

public  void test1(View view){
    int mId=1;
    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
                    .setContentTitle("My notification")
                    .setContentText("Hello World!");
    Intent resultIntent = new Intent(this, nfo.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addParentStack(nfo.class);
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
            stackBuilder.getPendingIntent(
                    0,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
    mBuilder.setContentIntent(resultPendingIntent);
    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(mId, mBuilder.build());

    mId++;
}

---

为notitification设置一个图标（您可以使用android studio默认图标进行测试），并确保您的按钮onClick方法名称，即test1（）与您在按钮属性中设置的名称相同

NotificationCompat.Builder mBuilder =
        new NotificationCompat.Builder(this)
                .setContentTitle("My notification")
                .setContentText("Hello World!");
                .setSmallIcon(R.drawable.cast_ic_notification_0)