關閉語音識別對話框時的空對象

您好，我正在打開一個應用程序，打開具有語音識別功能的社交網絡，該應用程序運行良好，但是如果語音識別對話框彈出並且我沒有說任何應用程序強制關閉按回按鈕，該logcat的部分代碼指向：關閉語音識別對話框時的空對象

if (firstWord.equals("open")) { 
      PackageManager packageManager = getPackageManager(); 
      List<PackageInfo> packs = packageManager 
        .getInstalledPackages(0); 
      int size = packs.size(); 
      boolean uninstallApp = false; 
      boolean exceptFlg = false; 
      for (int v = 0; v < size; v++) { 
       PackageInfo p = packs.get(v); 
       String tmpAppName = p.applicationInfo.loadLabel(
         packageManager).toString(); 
       String pname = p.packageName; 
       tmpAppName = tmpAppName.toLowerCase(); 
       if (tmpAppName.trim().toLowerCase(). 
         equals(secondWord.trim().toLowerCase())) { 

        PackageManager pm = this.getPackageManager(); 
        Intent appStartIntent = pm.getLaunchIntentForPackage(pname); 


        if (null != appStartIntent) { 
         try { 
          Toast.makeText(getApplicationContext(), "That App is not a Social One ;-))", 
            Toast.LENGTH_LONG).show(); 
         } catch (Exception e) { 
         } 
        } 
       } 
      } 
     } // end of open app code

我試圖添加}else{，但它沒有工作，

logcat的

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference 
      at mrad4tech.com.test.MainActivity.onActivityResult(MainActivity.java:94) 
      at android.app.Activity.dispatchActivityResult(Activity.java:6140) 
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3535) 
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3582) 
            at android.app.ActivityThread.access$1300(ActivityThread.java:144) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5223) 
            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:898) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693) 
09-25 20:12:26.265 7041-7041/mrad4tech.com.test E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: mrad4tech.com.test, PID: 7041 
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1234, result=0, data=null} to activity {mrad4tech.com.test/mrad4tech.com.test.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference 
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3539) 
      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3582) 
      at android.app.ActivityThread.access$1300(ActivityThread.java:144) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5223) 
      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:898) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference 
      at mrad4tech.com.test.MainActivity.onActivityResult(MainActivity.java:94) 
      at android.app.Activity.dispatchActivityResult(Activity.java:6140) 
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3535) 
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3582) 
            at android.app.ActivityThread.access$1300(ActivityThread.java:144) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5223) 
            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:898) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

完整的代碼

import android.content.Intent; 
import android.content.pm.ApplicationInfo; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
import android.os.Bundle; 
import android.app.Activity; 
import android.os.Handler; 
import android.speech.RecognizerIntent; 
import android.speech.SpeechRecognizer; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

import java.lang.ref.WeakReference; 
import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends Activity { 

    private 
    static 
    final 
    int VOICE_RECOGNITION_REQUEST_CODE = 1234; 
    private static final String TAG = String.valueOf(1); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button button1 = (Button) findViewById(R.id.button1); 
     button1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       startVoiceRecognitionActivity(); 
      } 
     }); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return 
       true; 
    } 

    public void onClick(View v) { 

     switch (v.getId()) { 

      case R.id.button1: 
       startVoiceRecognitionActivity(); 

       break; 

     } 


    } 


    public void startVoiceRecognitionActivity() { 

     Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); 
     intent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, getClass() 
       .getPackage().getName()); 
     intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, 
       RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); 
     intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5); 
     startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     String wordStr = null; 
     String[] words = null; 
     String firstWord = null; 
     String secondWord = null; 
     if (requestCode == VOICE_RECOGNITION_REQUEST_CODE 
       && resultCode == RESULT_OK) { 
      ArrayList<String> matches = data 
        .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); 
      wordStr = matches.get(0); 
      words = wordStr.split(" "); 
      firstWord = words[0]; 
      secondWord = words[1]; 
     } 

     if (firstWord.equals("open")) { 
      PackageManager packageManager = getPackageManager(); 
      List<PackageInfo> packs = packageManager 
        .getInstalledPackages(0); 
      int size = packs.size(); 
      boolean uninstallApp = false; 
      boolean exceptFlg = false; 
      for (int v = 0; v < size; v++) { 
       PackageInfo p = packs.get(v); 
       String tmpAppName = p.applicationInfo.loadLabel(
         packageManager).toString(); 
       String pname = p.packageName; 
       tmpAppName = tmpAppName.toLowerCase(); 
       if (tmpAppName.trim().toLowerCase(). 
         equals(secondWord.trim().toLowerCase())) { 

        PackageManager pm = this.getPackageManager(); 
        Intent appStartIntent = pm.getLaunchIntentForPackage(pname); 


        if (null != appStartIntent) { 
         try { 
          Toast.makeText(getApplicationContext(), "That App is not a Social One ;-))", 
            Toast.LENGTH_LONG).show(); 
         } catch (Exception e) { 
         } 
        } 
       } 
      } 
     } // end of open app code 
     else { 

     } 


    } 





}

我試圖添加其他} {Toast.makeText .....}，但沒有工作

來源

2015-09-25 Mahmoud M

'如果（空= appStartIntent！）'不應該這是'如果（appStartIntent！= NULL）'可能並不重要IDK的。還有什麼行是94行？ – 3kings

謝謝下面的傢伙幫我欣賞你的嘗試 –

if (requestCode == VOICE_RECOGNITION_REQUEST_CODE 
       && resultCode == RESULT_OK) { 
      ArrayList<String> matches = data 
        .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); 
      wordStr = matches.get(0); 
      words = wordStr.split(" "); 
      firstWord = words[0]; 
      secondWord = words[1]; 
     } // This ends above if 

     if (firstWord.equals("open")) {

在我看來，你繼續if (firstWord.equals...即使結果代碼WASN 't RESULT_OK。因此，您總是檢查firstWord是否等於某個東西，即使您沒有實際分配任何東西。

編輯：爲了避免混亂和過度縮進代碼，你可以簡單地做

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode != VOICE_RECOGNITION_REQUEST_CODE || resultCode != RESULT_OK) { 
      return; // don't do anything 
     } 
     // Assume you have all data 
     // ... 
    }

來源

2015-09-25 17:28:57 wasyl

OMG !!!!!!!!!你真的懂了！非常感謝你的搖滾！ –

我刪除了「}//這結束了上面，如果」並把它放在最後 –

我很高興我可以幫助。如果你喜歡這個答案，也可以考慮提高它 – wasyl

關閉語音識別對話框時的空對象

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