得到错误的片段

Question

我试图从片段致电ZXingScannerActivity调用startActivityForResult时

NewInventoryFragement.java

package info.androidhive.wolf; 

import android.app.Fragment; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
import android.widget.Toast; 

import info.androidhive.wolf.qrcode.ZXingScannerActivity; 
import info.androidhive.wolf.qrcode.ZXingConstants; 
import com.google.zxing.BarcodeFormat; 

/** 
* Created by Admin on 4/22/2015. 
*/ 
public class NewInventoryFragment extends Fragment{ 

    private static final int ZXING_SCANNER_REQUEST = 0; 
    private static final int ZXING_QR_SCANNER_REQUEST = 1; 
    Button button; 
    public NewInventoryFragment(){}; 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.new_inventory_fragment, container, false); 

     button=(Button) rootView.findViewById(R.id.button2); 
     button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       launchQRScanner(view); 
      } 
     }); 
     return rootView; 
    } 

    public void launchQRScanner(View v) { 
     if (isCameraAvailable()) { 
      Intent intent = new Intent(getActivity().getApplicationContext(), ZXingScannerActivity.class); 
      intent.putExtra(ZXingConstants.SCAN_FORMATS, BarcodeFormat.QR_CODE.toString()); 
      getActivity().startActivityForResult(intent, ZXING_SCANNER_REQUEST); 
     } else { 
      Toast.makeText(getActivity().getApplicationContext(), "Rear Facing Camera Unavailable", Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public boolean isCameraAvailable() { 
     PackageManager pm = getActivity().getPackageManager(); 
     return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA); 
    } 



    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     switch (requestCode) { 
      case ZXING_SCANNER_REQUEST: 
      case ZXING_QR_SCANNER_REQUEST: 
       if (resultCode == 1) { 
        Toast.makeText(getActivity().getApplicationContext(), "Scan Result = " + data.getStringExtra(ZXingConstants.SCAN_RESULT) + 
          ", Scan Format = " + data.getStringExtra(ZXingConstants.SCAN_RESULT_FORMAT), Toast.LENGTH_SHORT).show(); 

        } 
       break; 
     } 
    } 

} 

logcat的说

26260-26260/info.androidhive.slidingmenu E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    android.content.ActivityNotFoundException: Unable to find explicit activity class {info.androidhive.slidingmenu/info.androidhive.wolf.qrcode.ZXingScannerActivity}; have you declared this activity in your AndroidManifest.xml? 
      at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1556) 
      at android.app.Instrumentation.execStartActivity(Instrumentation.java:1530) 
      at android.app.Activity.startActivityFromFragment(Activity.java:3922) 
      at android.app.Fragment.startActivityForResult(Fragment.java:1025) 
      at android.app.Fragment.startActivityForResult(Fragment.java:1009) 
      at info.androidhive.wolf.NewInventoryFragment.launchQRScanner(NewInventoryFragment.java:46) 
      at info.androidhive.wolf.NewInventoryFragment$1.onClick(NewInventoryFragment.java:36) 
      at android.view.View.performClick(View.java:4222) 
      at android.view.View$PerformClick.run(View.java:17343) 
      at android.os.Handler.handleCallback(Handler.java:615) 
      at android.os.Handler.dispatchMessage(Handler.java:92) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:4895) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761) 
      at dalvik.system.NativeStart.main(Native Method) 

@line＃46 getActivity （）.startActivityForResult（intent，ZXING_SCANNER_REQUEST）; 我从Stack

引用这个我已经在增值活动的Manifest.xml

<application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="info.androidhive.wolf.MainActivity" 
      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="info.androidhive.wolf.qrcode.ZXingScannerActivity" 
      android:screenOrientation="landscape" 
      android:label="@string/app_name" 
      /> 


    </application> 

其实我在这里做的是MainActivity.java是延伸活性，并且具有导航抽屉多个片段来导航。

库存是带有添加新库存的按钮的片段之一意味着导航到NewInventoryFragment。

具有此@line＃46的NewInventoryFragment getActivity（）。startActivityForResult（intent，ZXING_SCANNER_REQUEST）;

是否正确的做法？

Answer 1

您无法在Fragment上处理此事件，因为它是从其自己的活动处理的。

我的意思是，片段没有上下文，因为是活动的一部分。有些事件只能在上下文中处理，因此，必须在包含该片段的活动内部编写这种类型的方法。