Android应用程序在发送到其他活动时崩溃

我正在尝试使用谷歌的新材料设计我的新应用程序，首先可以在我的android studio中找到它。所以我增加了一个第三党图书馆

此解决方案仅在我试图将其发送到下一屏幕时适用于一个屏幕（使用facebook登录按钮时崩溃）

我使用的库是：

我使用的是普通的Facebook SDK

这是我的堆栈跟踪：

02-04 12:33:22.924    3726-3726/com.geniusgentlemen.gp_android_app E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.geniusgentlemen.gp_android_app, PID: 3726
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.geniusgentlemen.gp_android_app/com.example.bart.gp_android_app.login_activity}: java.lang.ClassCastException: com.gc.materialdesign.views.

无法将ButtonRectangle转换为com.facebook.widget.LoginButton 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2298）上 在

android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.ClassCastException: com.gc.materialdesign.views.ButtonRectangle cannot be cast to com.facebook.widget.LoginButton
            at com.example.bart.gp_android_app.login_activity.onCreate(login_activity.java:130)
            at android.app.Activity.performCreate(Activity.java:5933)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

这是怎么回事？我试图更改facebook登录按钮，但这不起作用

login.xml文件

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:materialdesign="http://schemas.android.com/apk/res-auto"
xmlns:facebook="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".InitActivit">

<!-- The primary full-screen view. This can be replaced with whatever view
     is needed to present your content, e.g. VideoView, SurfaceView,
     TextureView, etc. -->


<!-- This FrameLayout insets its children based on system windows using
     android:fitsSystemWindows. -->
<FrameLayout android:layout_width="match_parent" android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="@drawable/background_test"
    android:backgroundTintMode="src_over">


    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

        <com.facebook.widget.ProfilePictureView
            android:id="@+id/profilePicture"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:gravity="center_horizontal"
            facebook:preset_size="normal"
            android:layout_gravity="center_horizontal|bottom"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="86dp" />

        <com.facebook.widget.LoginButton
            android:id="@+id/login_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            facebook:confirm_logout="false"
            facebook:fetch_user_info="true"
            android:layout_gravity="center|top"
            android:layout_below="@+id/speebee"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="50dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="SpeeBee"
            android:id="@+id/speebee"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="52dp"
            android:textColor="#ff350012"
            android:textSize="40dp"
            android:focusableInTouchMode="false" />


    </RelativeLayout>
</FrameLayout>

其初始化位置的代码：

    loginButton = (LoginButton) findViewById(R.id.login_button);
    loginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
        @Override
        public void onUserInfoFetched(GraphUser user) {
            login_activity.this.user = user;
            updateUI();
            handlePendingAction();
        }
    });

这些是第124至132条规则

这是handlePendingAction（）：

应要求，进口：

import com.example.bart.gp_android_app.util.SystemUiHider;


import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;
import com.facebook.AppEventsLogger;
import com.facebook.FacebookAuthorizationException;
import com.facebook.FacebookOperationCanceledException;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.model.GraphPlace;
import com.facebook.model.GraphUser;
import com.facebook.widget.FacebookDialog;
import com.facebook.widget.LoginButton;
import com.facebook.widget.ProfilePictureView;
import com.geniusgentlemen.support_classes.Api;
import com.geniusgentlemen.support_classes.ApiFunctions;
import com.loopj.android.http.RequestParams;
import org.json.JSONException;
import java.util.List;

---

原因：java.lang.ClassCastException:com.gc.materialdesign.views.ButtonRectangle无法转换到com.example.bart.gp_android_app.login_activity.onCreate（login_activity.java:130）上的com.facebook.widget.LoginButton。

该行是什么？将添加登录xml。第130行是这一行：handlePendingAction（）；并发布您的代码，尤其是

login_按钮

是初始化添加代码的地方。设置var，其中login_按钮被初始化，第130行后面的代码显示导入

private void handlePendingAction() {
    PendingAction previouslyPendingAction = pendingAction;
    // These actions may re-set pendingAction if they are still pending, but we assume they
    // will succeed.
    pendingAction = PendingAction.NONE;


}

import com.example.bart.gp_android_app.util.SystemUiHider;


import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;
import com.facebook.AppEventsLogger;
import com.facebook.FacebookAuthorizationException;
import com.facebook.FacebookOperationCanceledException;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.model.GraphPlace;
import com.facebook.model.GraphUser;
import com.facebook.widget.FacebookDialog;
import com.facebook.widget.LoginButton;
import com.facebook.widget.ProfilePictureView;
import com.geniusgentlemen.support_classes.Api;
import com.geniusgentlemen.support_classes.ApiFunctions;
import com.loopj.android.http.RequestParams;
import org.json.JSONException;
import java.util.List;