Facebook與Android工作室分享

親愛的人們的stackoverflow，Facebook與Android工作室分享

恐怕即時通訊急需幫助。有一個問題，我不斷遇到我的應用程序。我正在製作一個有三個按鈕的應用程序：一個用於查看鏈接，一個用於意圖，另一個用於在Facebook上分享內容（原因是因爲您無法再發送意圖了，或者因此我被告知）但是，根據Facebook開發者網站，我應該得到一個分享按鈕。用我的代碼，一切崩潰，我唯一能看到的就是共享對話框。我的問題是，我犯的主要錯誤是什麼？

我的主要活動代碼：

package things; 
import android.app.Fragment; 
import android.content.Context; 
import android.content.Intent; 
import android.net.Uri; 
import android.support.v4.app.FragmentActivity; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.webkit.JavascriptInterface; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.Button; 
import android.view.View.OnClickListener; 

import com.facebook.CallbackManager; 
import com.facebook.FacebookCallback; 
import com.facebook.FacebookException; 
import com.facebook.FacebookSdk; 
import com.facebook.share.ShareApi; 
import com.facebook.share.Sharer; 
import com.facebook.share.model.ShareLinkContent; 
import com.facebook.share.widget.ShareButton; 
import com.facebook.share.widget.ShareDialog; 

import java.util.Random; 


public class MainActivity extends ActionBarActivity { 

private Button btnScore; 
private Button btnShare; 

private static String APP_ID = "things"; 

CallbackManager callbackManager; 
ShareDialog shareDialog; 

//ms = mobile Scores 
WebView msWebView; 
WebView mfWebView; 


ShareLinkContent content = new ShareLinkContent.Builder() 
     .setContentTitle("Test") 
     .setContentUrl(Uri.parse("http://developers.facebook.com/android")) 
     .setContentDescription("Play Something with your facebook friends and many more people!") 
     .build(); 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    FacebookSdk.sdkInitialize(getApplicationContext()); 

    //Facebook for sharing 
    callbackManager = CallbackManager.Factory.create(); 
    shareDialog = new ShareDialog(this); 
    final ShareButton shareButton = (ShareButton) findViewById(R.id.fb_share_button); 


    int score = 64; 

    //Searches the phone for apps that can share simple data 
    final Intent sendIntent = new Intent(); 
    sendIntent.setAction(Intent.ACTION_SEND); 
    sendIntent.setType("text/plain"); 
    sendIntent.putExtra(Intent.EXTRA_TEXT, "My score of the last game was: " + score + " \n Can you beat my score?"); 

    //This is for the share dialog to show 





    //an iff statement if it shows 
    if (ShareDialog.canShow(ShareLinkContent.class)) { 
     ShareLinkContent linkContent = new ShareLinkContent.Builder() 
       .setContentTitle("Hello Facebook") 
       .setContentDescription(
         "The 'Hello Facebook' sample showcases simple Facebook integration") 
       .setContentUrl(Uri.parse("http://developers.facebook.com/android")) 
       .build(); 

     shareDialog.show(linkContent); 
    } 
    shareButton.setShareContent(content); 

    //The buttons 
    btnScore=(Button)findViewById(R.id.btnScores); 
    btnShare =(Button)findViewById(R.id.btnShare); 



    //the score Webview link 
    msWebView = new WebView(this); 
    msWebView.loadUrl("Thing"); 
    msWebView.setWebViewClient(new WebViewClient(){ 
     @Override 
     public boolean shouldOverrideUrlLoading(WebView view, String  url){ 
      view.loadUrl(url); 
      return true; 
     } 
    }); 

    ShareDialog.show(this, content); 
    btnScore.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View vw) { 
      setContentView(msWebView); 
     } 
    }); 

    //the share button 
    btnShare.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View vw)  {startActivity(Intent.createChooser(sendIntent, "share...")); 

     } 
    }); 
    shareButton.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      shareButton.setShareContent(content); 
     } 
    } ); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu. 
    // Adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 

    // Access the Share Item defined in menu XML 


    return true; 
} 

//special method to handle the callbackmanager 
@Override 
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    callbackManager.onActivityResult(requestCode, resultCode, data); 
    ShareDialog.show(this, content); 
} 

@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.menu_item_share) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 


}

我activity_main.xml中：

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin"  tools:context=".MainActivity" 
android:background="#ffd2e489"> 

<TextView android:text="Results" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/text" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="View" 
    android:id="@+id/btnScores" 
    android:background="#ffff7878" 
    android:layout_marginTop="40dp" 
    android:layout_below="@+id/text" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_toLeftOf="@+id/text" 
    android:layout_toStartOf="@+id/text" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Share" 
    android:id="@+id/btnShare" 
    android:background="#ff20f6ff" 
    android:layout_alignTop="@+id/btnScores" 
    android:layout_toRightOf="@+id/text" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" /> 

<com.facebook.share.widget.ShareButton 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:id="@+id/fb_share_button" 
android:text="SHARE" 
android:layout_alignParentBottom="true" 
android:layout_centerHorizontal="true" 
android:layout_marginBottom="175dp" /> 


</RelativeLayout>

而且萬一我的Android：清單：

<uses-permission android:name="android.permission.INTERNET" /> 
<application 
    android:name=".MyApplication" 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"/> 
    <activity 

     android:name=".MainActivity" 
     android:label="@string/app_name" > 

     <intent-filter> 
      <provider android:authorities="com.facebook.app.FacebookContentProviderthings" 
       android:name="com.facebook.FacebookContentProvider" 
       android:exported="true"/> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.DEFAULT"/> 
      <data android:mimeType="text/plain"/> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity android:name="com.facebook.FacebookActivity" 
     android:configChanges= 
      "keyboard|keyboardHidden|screenLayout|screenSize|orientation" 
     android:theme="@android:style/Theme.Translucent.NoTitleBar" 
     android:label="@string/app_name" /> 
    android:debuggable="true" 
</application> 

</manifest>

對不起長後，我知道答案在那裏，但無法找到綠色的錯誤這一直困擾着我一個星期。

感謝您的閱讀！

Frederick

編輯：我使用的是FacebookSDK 4.0。

編輯2.0：錯誤：

Caused by: java.lang.NullPointerException 
     at things.MainActivity.onCreate(MainActivity.java:93) 
     at android.app.Activity.performCreate(Activity.java:5231) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)

編輯3.0 logcat的：

Process: nl.test.test, PID: 12287 
java.lang.ExceptionInInitializerError 
     at java.lang.reflect.Constructor.constructNative(Native Method) 
     at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
     at android.view.LayoutInflater.createView(LayoutInflater.java:594) 
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696) 
     at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
     at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:240) 
     at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102) 
     at nl.test.test.MainActivity.onCreate(MainActivity.java:60) 
     at android.app.Activity.performCreate(Activity.java:5231) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286) 
     at android.app.ActivityThread.access$800(ActivityThread.java:144) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:212) 
     at android.app.ActivityThread.main(ActivityThread.java:5135) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
     at dalvik.system.NativeStart.main(Native Method) 
Caused by: null 
     at com.facebook.internal.Validate.sdkInitialized(Validate.java:99) 
     at com.facebook.FacebookSdk.getCallbackRequestCodeOffset(FacebookSdk.java:735) 
     at com.facebook.internal.CallbackManagerImpl$RequestCodeOffset.toRequestCode(CallbackManagerImpl.java:109) 
     at com.facebook.share.widget.ShareButton.<clinit> (ShareButton.java:36) 
    at java.lang.reflect.Constructor.constructNative(Native Method) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
    at android.view.LayoutInflater.createView(LayoutInflater.java:594) 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696) 

android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 

android.view.LayoutInflater.inflate(LayoutInflater.java:492) 



android.view.LayoutInflater.inflate(LayoutInflater.java:397) 

    android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:240) 
       android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102) 
      test.MainActivity.onCreate(MainActivity.java:60) 
      at android.app.Activity.performCreate(Activity.java:5231) 
      android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
      android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201) 
      android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286) 
      android.app.ActivityThread.access$800(ActivityThread.java:144)     android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246) 
      android.os.Handler.dispatchMessage(Handler.java:102) 
      android.os.Looper.loop(Looper.java:212) 
     android.app.ActivityThread.main(ActivityThread.java:5135) 
     java.lang.reflect.Method.invokeNative(Native Method) 
     java.lang.reflect.Method.invoke(Method.java:515) 
     com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878) 
     com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
dalvik.system.NativeStart.main(Native Method)

來源

2015-04-24 frederick van der meulen

我認爲你的清單文件中有一個錯誤，在android：debuggable =「true」下面是應用程序標籤容器外部。第二次發佈您的logcat將幫助我們找到該錯誤 –

修復了錯誤，但我仍然有同樣的問題... –

您忘記了'setContentView（R.layout.YOUR_LAYOUT_NAME）;'在oncreate 'super.onCreate ' –

好了，經過一番工作，我找到了答案。答案很簡單：，而不是這樣的：

super.onCreate(savedInstanceState); 
FacebookSdk.sdkInitialize(getApplicationContext());

但是，你需要做的是這樣的：

FacebookSdk.sdkInitialize(getApplicationContext()); 
super.onCreate(savedInstanceState);

之所以這樣做，是因爲你想之前初始化了Facebook SDK你創建應用程序實例，否則，Facebook SDK永遠不能被應用程序使用。

我希望如果有人有和我一樣的問題，可以使用這個！

來源

2015-05-08 12:30:40

Facebook與Android工作室分享

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