将Calllog细节存储到SQLite DB中

Question

我在应用程序中遇到了一些麻烦。

我想要做的是从通话记录中获取通话记录，将通话记录传递到我的数据库进行存储，然后在需要显示时检索值。

DB被创建，但看起来像这些值拒绝插入。下面是我的代码和logcat。

帮助非常感谢。

我的主要活动

package com.example.mobilebillforecaster; 

import com.example.mbf.R; 

import android.app.TabActivity; 
import android.content.ContentValues; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.os.Handler; 
import android.provider.CallLog; 
import android.widget.TabHost; 
import android.widget.TextView; 

@SuppressWarnings({ "deprecation", "deprecation" }) 
public class EtiMainScreen extends TabActivity { 

SQLiteDatabase calllog; 

Handler hand = new Handler(); 
Cursor cursor; 
ContentValues cv; 

TextView tvnatmins, tvintmins, tvnatsms; 

@SuppressWarnings("deprecation") 
protected void onCreate(Bundle Bundle) { 
    super.onCreate(Bundle); 
    setContentView(R.layout.eti_main_screen); 
    TabHost.TabSpec spec = getTabHost().newTabSpec("tag1"); 

    spec.setContent(R.id.mainmenu); 
    spec.setIndicator("Main Menu"); 
    getTabHost().addTab(spec); 

    spec = getTabHost().newTabSpec("tag2"); 
    spec.setContent(R.id.billhist); 
    spec.setIndicator("Billing History"); 
    getTabHost().addTab(spec); 

    getTabHost().setCurrentTab(0); 

    tvnatmins = (TextView) findViewById(R.id.tvnatmins); 
    tvintmins = (TextView) findViewById(R.id.tvintmins); 
    tvnatsms = (TextView) findViewById(R.id.tvnatsms); 

    getCallDetails(); 

} 

private void getCallDetails() { 

    CallRecords recdb = new CallRecords(); 

    StringBuffer sb = new StringBuffer(); 
    Cursor managedCursor = getContentResolver().query(
      CallLog.Calls.CONTENT_URI, null, null, null, null); 
    int number = managedCursor.getColumnIndex(CallLog.Calls.NUMBER); 
    int type = managedCursor.getColumnIndex(CallLog.Calls.TYPE); 
    int duration = managedCursor.getColumnIndex(CallLog.Calls.DURATION); 

    while (managedCursor.moveToNext()) { 

     String callDuration = managedCursor.getString(duration); 

     recdb.open(); 

     cv.put("CALL_NUMBER", number); 
     cv.put("CALL_TYPE", type); 
     cv.put("CALL_DURATION", duration); 
     recdb.insertValues("Records", cv); 
     recdb.close(); 

     sb.append("" + callDuration); 

    } 
    managedCursor.close(); 
    tvnatmins.setText(sb); 
} 

// tvnatmins.setText(number); 
// tvintmins.setText(type); 
// tvnatsms.setText(duration); 

} 

MY DB

package com.example.mobilebillforecaster; 



import android.content.Context; 

import android.content.ContentValues; 
import android.database.Cursor; 

import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
public class CallRecords { 

private static final int DATABASE_VERSION = 1; 
private DatabaseHelper DBhelper; 
public SQLiteDatabase callDB; 
static final String DATABASE_NAME = "DBLogs"; 
static final String TABLE_NAME = " Records"; 

public static final String CALL_ROWID = "_id"; 
public static final String CALL_NUMBER = "cnumber"; 
public static final String CALL_DURATION = "cduration"; 
public static final String CALL_TYPE = "ctype"; 

Context context; 

private static final String Records = "CREATE TABLE " + TABLE_NAME + "(" 
     + CALL_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CALL_NUMBER 
     + " INTEGER, " + CALL_DURATION + " INTEGER, " + CALL_TYPE 
     + " INTEGER" + ");"; 

private static class DatabaseHelper extends SQLiteOpenHelper { 

    public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     // TODO Auto-generated constructor stub 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 
     db.execSQL(Records); 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // TODO Auto-generated method stub 
     db.execSQL("DROP TABLE IF EXISTS" + Records); 

    } 

} 

public CallRecords open() { 

    DBhelper = new DatabaseHelper(context); 
    callDB = DBhelper.getWritableDatabase(); 

    return this; 

} 

public void close() { 
    DBhelper.close(); 
} 

public long insertValues(String rectable, ContentValues conValues) { 
    return callDB.insert(rectable, null, conValues); 

} 

public Cursor getAllLogs() { 

    String sql = "SELECT CALL_ROWID ,CALL_TYPE , CALL_DURATION, CALL_NUMBER 
FROM Records "; 
    Cursor cursor = callDB.rawQuery(sql, null); 
    return cursor; 

} 
} 

，最后我的logcat

04-21 20:42:57.294: E/AndroidRuntime(9388): FATAL EXCEPTION: main 
04-21 20:42:57.294: E/AndroidRuntime(9388): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mbf/com.example.mobilebillforecaster.EtiMainScreen}: java.lang.NullPointerException 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.os.Looper.loop(Looper.java:137) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread.main(ActivityThread.java:5039) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at dalvik.system.NativeStart.main(Native Method) 
04-21 20:42:57.294: E/AndroidRuntime(9388): Caused by: java.lang.NullPointerException 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at com.example.mobilebillforecaster.CallRecords.open(CallRecords.java:59) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at com.example.mobilebillforecaster.EtiMainScreen.getCallDetails(EtiMainScreen.java:66) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at com.example.mobilebillforecaster.EtiMainScreen.onCreate(EtiMainScreen.java:47) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.Activity.performCreate(Activity.java:5104) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
04-21 20:42:57.294: E/AndroidRuntime(9388):  ... 11 more 

谢谢您！

Answer 1

在你cv变化的声明ContentValues cv = new ContentValues();

您需要在线59 CallRecords

public CallRecords(Context context) 
{ 
    this.context = context; 
} 

变化CallRecords recdb = new CallRecords();
要CallRecords recdb = new CallRecords(this);