我的應用程序工作api23並墜毀，機上api11

Question

我的應用程序工作api23並墜毀，機上api11或android4 我覺得G類導致崩潰。類G中的 我已將assets資源文件夾上的sqlite數據庫複製到外部存儲。 當我明確機器人：名字=「G」上androidmanifest我的應用程序上api11但在按鈕，讀取數據庫佈局點擊運行，則不會在我的項目從數據庫中讀取並墜毀我的應用程序

androidmanifest is= 
<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="view.viramaham.quiz.viraquiz"> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

<application 

    android:name=".G" 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:roundIcon="@mipmap/ic_launcher_round" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 

    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 

    </activity> 

    <activity android:name=".Main_soalat"> 

    </activity> 

    <activity android:name=".pasokhnameh"> 

    </activity> 

    </application> 
</manifest> 

和G級is =

package view.viramaham.quiz.viraquiz; 
import android.app.Application; 
import android.content.Context; 
import android.content.Intent; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Environment; 
import android.support.v7.app.AppCompatActivity; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 




public class G extends Application { 
public static Context context; 
public static String SDK_DIR =  Environment.getExternalStorageDirectory().getAbsolutePath(); 
public static String APP_DIR = SDK_DIR + "/database/"; 
public static SQLiteDatabase database; 


@Override 
public void onCreate() { 

    super.onCreate(); 


    context = getApplicationContext(); 
    File file = new File(APP_DIR); 

    if (!file.exists()) { 
     try { 
      file.mkdirs(); 
      file.createNewFile(); 
       copyFromAssets(getBaseContext().  getAssets() . open  ("viraquiz.sqlite"), 
        new FileOutputStream(APP_DIR + "/viraquiz.sqlite")); 

     } catch (IOException e) { 

      e.printStackTrace(); 
     } 
    }//payandatabase 



}//oncreate 

public void copyFromAssets(InputStream inputStream, OutputStream outputStream) { 

    byte[] buffer = new byte[1024]; 
    int length; 
    try { 
     while ((length = inputStream.read(buffer)) > 0) { 
      outputStream.write(buffer, 0, length); 

     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    try { 
     inputStream.close(); 
     outputStream.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 


}//payan copyFromAssets 



} 

Answer 1

api 11第一個檢查類G.我的類有一個eror.i更改類G並在所有API上工作我的程序。 G級是=

package view.viramaham.quiz.viraquiz; 
import android.app.Application; 
import android.content.Context; 
import android.content.Intent; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Environment; 
import android.support.v7.app.AppCompatActivity; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 




public class G extends Application { 
public static Context context; 
public static String SDK_DIR = Environment.getExternalStorageDirectory().getAbsolutePath(); 
public static String APP_DIR = SDK_DIR + "/database/"; 
public static SQLiteDatabase database; 


@Override 
public void onCreate() { 

    super.onCreate(); 


    context = getApplicationContext(); 
    File file = new File(APP_DIR); 

    if (!file.exists()) { 
     try { 
      file.mkdirs(); 
      file.createNewFile(); 
      copyFromAssets(getBaseContext().getAssets().open("viraquiz.sqlite"), 
        new FileOutputStream(APP_DIR + "/viraquiz.sqlite")); 

     } catch (IOException e) { 

      e.printStackTrace(); 
     } 
    }//payandatabase 



}//oncreate 

public void copyFromAssets(InputStream inputStream, OutputStream outputStream) { 

    byte[] buffer = new byte[1024]; 
    int length; 
    try { 
     while ((length = inputStream.read(buffer)) > 0) { 
      outputStream.write(buffer, 0, length); 

     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    try { 
     inputStream.close(); 
     outputStream.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 


}//payan copyFromAssets 

}