Uygulaması, ilk başlatma etkinliğini

değiştirdikten sonra başlatılmayacak, böylece küçük bir sınav oyunu olan bir uygulama oluşturdum ve her biri kendi soru türleriyle 3 aktiviteye sahip oldum. Başlangıçta, başlangıç ekranı olarak coğrafya bölümünü aldım ancak başlatma ekranını "ana sayfa" olarak değiştirmeye çalıştığımda, uygulama başlatılmayacak. Eclipse 0 hata gösteriyor.Uygulaması, ilk başlatma etkinliğini

yeni ana ekran kodu:

package com.example.geoquizlab1solution; 

import android.app.Activity; 
import android.content.Intent; 
//import android.content.SharedPreferences; 
import android.os.Bundle; 
//import android.preference.PreferenceManager; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
//import android.widget.ImageButton; 
import android.widget.TextView; 
//import android.widget.Toast; 
import android.media.MediaPlayer; 

public class HomeScreen extends Activity { 

private TextView mWelcome; 
private Button mSportsButton; 
private Button mGeoButton; 
private Button mMusicButton; 
final MediaPlayer mp = MediaPlayer.create(this, R.raw.welcome); 






@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.home_page); 


    mWelcome = (TextView)findViewById(R.id.welcome_text); 
    ((View) mWelcome) .setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      mp.start(); 
     } 
    }); 

    mGeoButton = (Button)findViewById(R.id.geo_button); 
    mGeoButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent1 = new Intent(HomeScreen.this, QuizActivity.class); 
      if (intent1 != null) { 
       startActivity(intent1); 
     } 
     } 
    }); 

    mSportsButton = (Button)findViewById(R.id.sports_button); 
    mSportsButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent1 = new Intent(HomeScreen.this, SportsQuiz.class); 
      if (intent1 != null) { 
       startActivity(intent1); 
      } 
     } 
    }); 

    mMusicButton = (Button)findViewById(R.id.music_button); 
    mMusicButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent1 = new Intent(HomeScreen.this, MusicQuiz.class); 
      if (intent1 != null) { 
       startActivity(intent1); 
      } 
     } 
    }); 

} 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.activity_quiz, menu); 
    return true; 
} 



}

Eski başlatma ekranı kodu:

package com.example.geoquizlab1solution; 

import android.app.Activity; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageButton; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.media.MediaPlayer; 

public class QuizActivity extends Activity { 

private Button mTrueButton; 
private Button mFalseButton; 
private ImageButton mNextButton; 
private ImageButton mPreviousButton; 
private TextView mQuestionTextView; 
private Button mResetButton; 
private Button mSportsButton; 
private Button mGeoButton; 
private Button mMusicButton; 
private int counter = 0; 


private TrueFalse[] mQuestionBank = new TrueFalse[] { 
     new TrueFalse(R.string.question_oceans, true), 
     new TrueFalse(R.string.question_mideast, false), 
     new TrueFalse(R.string.question_africa, false), 
     new TrueFalse(R.string.question_americas, true), 
     new TrueFalse(R.string.question_asia, true) 
}; 


private int mCurrentIndex=0; 

private void updateQuestion(){ 
    int question = mQuestionBank[mCurrentIndex].getQuestion(); 
    mQuestionTextView.setText(question); 
} 


private void checkAnswer(boolean userPressedTrue) { 
    boolean answerIsTrue = mQuestionBank[mCurrentIndex].isTrueQuestion(); 
    int messageResId = 0; 
    final MediaPlayer mp = MediaPlayer.create(this, R.raw.ding); 
    final MediaPlayer mp1 = MediaPlayer.create(this, R.raw.wrong); 

    SharedPreferences app_preferences = 
      PreferenceManager.getDefaultSharedPreferences(this); 



    if (userPressedTrue == answerIsTrue) { 
     mp.start(); 
     messageResId = R.string.correct_toast; 
     counter++; 
     if (counter % 5 == 0) { 
      final MediaPlayer mp2 = MediaPlayer.create(this, R.raw.applause); 
      mp2.start(); 
     } 
    } 
     else { 
      mp1.start(); 
      messageResId = R.string.incorrect_toast; 
     } 
    SharedPreferences.Editor editor = app_preferences.edit(); 
     editor.putInt("count", counter); 
    Toast.makeText(this, messageResId, Toast.LENGTH_SHORT).show(); 
    Toast.makeText(this,"Score:" + counter, Toast.LENGTH_SHORT).show(); 
    editor.commit(); 
     } 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_quiz); 


    mGeoButton = (Button)findViewById(R.id.geo_button); 
    mGeoButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      counter = 0; 
      Toast.makeText(getApplicationContext(), "Score: 0", 
        Toast.LENGTH_SHORT).show(); 
      mCurrentIndex = 0; 
      updateQuestion(); 
     } 
    }); 

    mSportsButton = (Button)findViewById(R.id.sports_button); 
    mSportsButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent1 = new Intent(QuizActivity.this, SportsQuiz.class); 
      if (intent1 != null) { 
       startActivity(intent1); 
      } 
     } 
    }); 

    mMusicButton = (Button)findViewById(R.id.music_button); 
    mMusicButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      final Intent intent1 = new Intent(QuizActivity.this, MusicQuiz.class); 
      if (intent1 != null) { 
       startActivity(intent1); 
      } 
     } 
    }); 

    mTrueButton = (Button)findViewById(R.id.true_button); 
    mTrueButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      checkAnswer(true); 

     } 
    }); 

    mFalseButton = (Button)findViewById(R.id.false_button); 
    mFalseButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      checkAnswer(false); 
      } 
    }); 
    mQuestionTextView = (TextView)findViewById(R.id.question_text_view); 
    ((View) mQuestionTextView) .setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length; 
      updateQuestion(); 
     } 
    }); 
    updateQuestion(); 

    mPreviousButton = (ImageButton)findViewById(R.id.previous_button); 
    ((View) mPreviousButton) .setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
       if (mCurrentIndex != 0) { 
        mCurrentIndex = (mCurrentIndex - 1) % mQuestionBank.length; 
       updateQuestion(); 
       } 
       else { 
        mCurrentIndex = (mCurrentIndex + 4) % mQuestionBank.length; 
       } 
     } 
    }); 
    updateQuestion(); 


    mNextButton = (ImageButton)findViewById(R.id.next_button); 
    ((View) mNextButton).setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length; 
      updateQuestion(); 
     } 
     }); 
    updateQuestion(); 

    mResetButton = (Button)findViewById(R.id.reset_button); 
    ((View) mResetButton).setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      counter = 0; 
      Toast.makeText(getApplicationContext(), "Score: 0", 
        Toast.LENGTH_SHORT).show(); 
      mCurrentIndex = 0; 
      updateQuestion(); 
     } 
    }); 
} 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.activity_quiz, menu); 
    return true; 
} 



}

AndroidManifest dosyası:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.geoquizlab1solution" 
android:versionCode="2" 
android:versionName="1.1" 
xmlns:tools="http://schemas.android.com/tools" tools:ignore="OldTargetApi"> 


<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="23" 
    android:maxSdkVersion="23"/> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/quiz" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.example.geoquizlab1solution.HomeScreen" 
     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:screenOrientation="unspecified" android:name="com.example.geoquizlab1solution.QuizActivity"/> 
    <activity android:screenOrientation="unspecified" android:name="com.example.geoquizlab1solution.SportsQuiz"/> 
    <activity android:screenOrientation="unspecified" android:name="com.example.geoquizlab1solution.MusicQuiz"/> 
    </application> 
    </manifest>

Yeni Ana Ekran düzeni dosyası:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
android:background="@drawable/spotlight"> 

<TextView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_weight="1" 
    android:textAlignment="gravity" 
    android:gravity="center" 
    android:textStyle="italic" 
    android:id="@+id/welcome_text" 
    android:textColor="#5E5E5E" 
    android:background="@drawable/welcomeview"/> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:layout_weight="6"> 

    <Button 
      android:id="@+id/geo_button" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/geo_button" 
      android:textColor="#2ADB20" 
      android:background="#275393" 
      android:layout_margin="25dp"/> 
     <Button 
      android:id="@+id/sports_button" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/sports_button" 
      android:textColor="#FFFFFF" 
      android:background="#ED1515" 
      android:layout_margin="25dp"/> 

     <Button 
      android:id="@+id/music_button" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/music_button" 
      android:textColor="#FFD700" 
      android:background="#544F4F" 
      android:layout_margin="25dp"/> 


</LinearLayout>

Giriş: = "com.example adı:

04-05 15:46:29.861: E/AndroidRuntime(22191): FATAL EXCEPTION: main 
04-05 15:46:29.861: E/AndroidRuntime(22191): Process: com.example.geoquizlab1solution, PID: 22191 
04-05 15:46:29.861: E/AndroidRuntime(22191): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.geoquizlab1solution/com.example.geoquizlab1solution.HomeScreen}: java.lang.NullPointerException 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2124) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread.access$800(ActivityThread.java:139) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.os.Handler.dispatchMessage(Handler.java:102) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.os.Looper.loop(Looper.java:136) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread.main(ActivityThread.java:5097) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at java.lang.reflect.Method.invokeNative(Native Method) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at java.lang.reflect.Method.invoke(Method.java:515) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at dalvik.system.NativeStart.main(Native Method) 
04-05 15:46:29.861: E/AndroidRuntime(22191): Caused by: java.lang.NullPointerException 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.content.ContextWrapper.getResources(ContextWrapper.java:89) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:78) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.media.MediaPlayer.create(MediaPlayer.java:844) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at com.example.geoquizlab1solution.HomeScreen.<init>(HomeScreen.java:22) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at java.lang.Class.newInstanceImpl(Native Method) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at java.lang.Class.newInstance(Class.java:1208) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.Instrumentation.newActivity(Instrumentation.java:1084) 
04-05 15:46:29.861: E/AndroidRuntime(22191): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2115) 
04-05 15:46:29.861: E/AndroidRuntime(22191): ... 11 more 
04-05 15:46:32.298: D/PhoneStatusBar(1186): StatusBarWindow onTouchListener.onTouch

kaynak

2016-04-05 NCavins

sadece yerine 'android neden önce ayar değerlerini, onCrete() yöntemi içinde gömün. geoquizlab1solution.HomeScreen "'with with android: name =". HomeScreen "' –

@bryan Manifest'te? – NCavins

manifest –

sil 'final MediaPlayer mp = MediaPlayer.create(this, R.raw.welcome);' ve Aktivite oluşturarak bu hatayı

kaynak

2016-04-05 22:38:27

Bu düzeltme ekledi, Eclipse ayarlarında yapmam gereken bir şey var mı? – NCavins

hayır lütfen değişikliklerinizi yaptıktan sonra hatayı gönderiniz –

Eclipse hiç hata göstermiyor ama ben – NCavins

Uygulaması, ilk başlatma etkinliğini

cevap

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