應用程序已不幸停止（Facebook登錄）

Question

我不知道爲什麼它顯示「應用程序不幸停止」的錯誤。我看到了DDMS會話，它所說的是「找不到appcompat_v7.apk！」

的mainactivity.java是：

包com.example.iwashere;

import java.io.IOException; 
import java.net.MalformedURLException; 

import com.facebook.android.DialogError; 
import com.facebook.android.Facebook; 
import com.facebook.android.Facebook.DialogListener; 
import com.facebook.android.FacebookError; 

import android.support.v4.app.FragmentActivity; 
import android.support.v7.app.ActionBarActivity; 
import android.content.Intent; 
import android.media.Image; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ImageView; 

public class MainActivity extends ActionBarActivity implements OnClickListener { 


Facebook fb; 

ImageView button; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     String facebook_app_id = getString (R.string.facebook_app_id); 
     fb = new Facebook (facebook_app_id); 
     button = (ImageView)findViewById(R.id.login); 
     button.setOnClickListener(this); 
     updateButtonImage(); 
    } 

     private void updateButtonImage() { 
     // TODO Auto-generated method stub 

     if(fb.isSessionValid()) 
     { 
      button.setImageResource(R.id.logout); 
     } else{ 
      button.setImageResource(R.id.login); 
     } 
    } 

     @Override 
     public void onClick(View v) 

     { 
      if(fb.isSessionValid()){ 
      //button close our session - logout of facebook 
       try { 
        fb.logout(getApplicationContext()); 
        updateButtonImage(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 


      } 
      else { 

      //login to facebook 
      fb.authorize(this, new DialogListener() { 

      @Override 
      public void onFacebookError(FacebookError e) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
     public void onError(DialogError e) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onComplete(Bundle values) { 
      // TODO Auto-generated method stub 

      } 

      @Override 
      public void onCancel() { 
       // TODO Auto-generated method stub 

      } 
     }); 
     } 
    } 


     @Override 
     protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     // TODO Auto-generated method stub 
     super.onActivityResult(requestCode, resultCode, data); 
     fb.authorizeCallback(requestCode, resultCode, data); 
    } 

}

和xml是：

<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:background="@drawable/background1" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.iwashere.MainActivity" > 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/hello_world" 
     android:textColor="#FFFF"/> 

    <ImageView 
     android:id="@+id/login" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@drawable/login" /> 

      <ImageView 
      android:id="@+id/logout" 
      android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:src="@drawable/logout" 
       android:visibility="invisible"/> 


    </RelativeLayout> 

Answer 1

extends ActionBarActivity 

替代由

extends Activity 

除去此：

 import android.support.v4.app.FragmentActivity; 
    import android.support.v7.app.ActionBarActivity;