Android 不幸的是，应用程序已停止工作？VFY:找不到签名中引用的类

在我的应用程序中，我想添加Facebook SDK。在那个应用程序停止后，我一直在关注一个教程

这是我的密码： 雄激素受体活性

public class AndroidFacebookActivity extends AppCompatActivity {

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

    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.activity_main);
}
}

登录片段：

public class LoginFragment extends Fragment {
private CallbackManager callbackManager=null;
private AccessTokenTracker mtracker=null;
private ProfileTracker mprofileTracker=null;
public static final String PARCEL_KEY="parcel_key";
private LoginButton loginButton;

FacebookCallback<LoginResult> callback=new FacebookCallback<LoginResult>() {
    @Override
    public void onSuccess(LoginResult loginResult) {
        Profile profile=Profile.getCurrentProfile();
        homeFragment(profile);
    }

    @Override
    public void onCancel() {

    }

    @Override
    public void onError(FacebookException error) {

    }
};




@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_login, container, false);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    callbackManager = CallbackManager.Factory.create();
    mtracker = new AccessTokenTracker() {
        @Override
        protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken) {

            Log.v("AccessTokenTracker", "oldAccessToken=" + oldAccessToken + "||" + "CurrentAccessToken" + currentAccessToken);
        }
    };
    mprofileTracker = new ProfileTracker() {
        @Override
        protected void onCurrentProfileChanged(Profile oldProfile, Profile currentProfile) {

            Log.v("Session Tracker", "oldProfile=" + oldProfile + "||" + "currentProfile" + currentProfile);
            homeFragment(currentProfile);

        }
    };
    mtracker.startTracking();
    mprofileTracker.startTracking();
}
private void homeFragment(Profile profile) {

    if (profile != null) {
        Bundle mBundle = new Bundle();
        mBundle.putParcelable(PARCEL_KEY, profile);
        HomeFragment hf = new HomeFragment();
        hf.setArguments(mBundle);

        FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager
                .beginTransaction();
        fragmentTransaction.replace(R.id.mainContainer, new HomeFragment());
        fragmentTransaction.commit();
    }
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    loginButton = (LoginButton) view.findViewById(R.id.login_button);
    loginButton.setReadPermissions("user_friends");
    // If using in a fragment
    loginButton.setFragment(this);
    loginButton.registerCallback(callbackManager, callback);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callbackManager.onActivityResult(requestCode, resultCode, data);
}

@Override
public void onStop() {
    super.onStop();
    mtracker.stopTracking();
    mprofileTracker.stopTracking();
}


public boolean isLoggedIn() {
    AccessToken accessToken = AccessToken.getCurrentAccessToken();
    return accessToken != null;
}

@Override
public void onResume() {
    super.onResume();

    if (isLoggedIn()) {
        loginButton.setVisibility(View.INVISIBLE);
        Profile profile = Profile.getCurrentProfile();
        homeFragment(profile);
    }

}
}

Manifest.XML

<?xml version="1.0" encoding="utf-8"?>

每当您的代码遇到一些

RuntimeException

时，就会出现错误“不幸的是，应用程序已停止工作”，大多数情况下都是

NullPointerException

，就像您的情况一样（您可以在logcat中注意到

NullPointerException

）。作为android编程的新手，它经常出现。正如您所说，您从一些教程中获得了帮助，我猜您只是将代码复制到项目中，然后尝试运行。如果我错了，请纠正我。如果你这样做了，那么先撤销它，然后试着先理解代码。当你感觉到你抓住了一些东西，现在你想开始了，从复制小块代码开始，然后在每次添加新的代码块时运行它。像这样，你将继续检查该块是否真的有效，并且你将提升你的信心。那么，总有一天你会遇到那邪恶的部分！现在知道了到底是什么导致疼痛，你就能很好地治疗它了！简而言之，我想说的是，当您继续前进时，继续调试聚合代码。祝你好运

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.INTERNET"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" >
    <meta-data
        android:name="com.facebook.sdk.ApplicatioId"
        android:value="@string/facebook_app_id"></meta-data>
    <activity android:name=".AndroidFacebookActivity"
        android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.facebook.FacebookActivity"
        android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Translucent.NoTitleBar" />

</application>

04-18 23:20:55.898 25376-25376/? D/dalvikvm: Late-enabling CheckJNI
04-18 23:20:56.538 25376-25376/com.example.bebo.facebook W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
04-18 23:20:56.548 25376-25376/com.example.bebo.facebook I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.view.WindowCallbackWrapper.onSearchRequested
04-18 23:20:56.558 25376-25376/com.example.bebo.facebook W/dalvikvm: VFY: unable to resolve interface method 15210: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
04-18 23:20:56.568 25376-25376/com.example.bebo.facebook D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
04-18 23:20:56.568 25376-25376/com.example.bebo.facebook I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode
04-18 23:20:56.568 25376-25376/com.example.bebo.facebook W/dalvikvm: VFY: unable to resolve interface method 15214: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
04-18 23:20:56.568 25376-25376/com.example.bebo.facebook D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
04-18 23:20:56.828 25376-25376/com.example.bebo.facebook I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.widget.TintTypedArray.getChangingConfigurations
04-18 23:20:56.858 25376-25376/com.example.bebo.facebook W/dalvikvm: VFY: unable to resolve virtual method 464: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
04-18 23:20:56.858 25376-25376/com.example.bebo.facebook D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
04-18 23:20:56.858 25376-25376/com.example.bebo.facebook I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.widget.TintTypedArray.getType
04-18 23:20:56.858 25376-25376/com.example.bebo.facebook W/dalvikvm: VFY: unable to resolve virtual method 486: Landroid/content/res/TypedArray;.getType (I)I
04-18 23:20:56.858 25376-25376/com.example.bebo.facebook D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
04-18 23:20:57.328 25376-25376/com.example.bebo.facebook D/OpenGLRenderer: Enabling debug mode 0
04-18 23:20:57.558 25376-25401/com.example.bebo.facebook W/dalvikvm: threadid=11: thread exiting with uncaught exception (group=0x41603c08)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime: Process: com.example.bebo.facebook, PID: 25376
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime: java.lang.NullPointerException
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at com.facebook.internal.Utility.queryAppSettings(Utility.java:822)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at com.facebook.login.widget.LoginButton$1.run(LoginButton.java:489)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-18 23:20:57.568 25376-25401/com.example.bebo.facebook E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:841)