我的申请遇到了一些问题。
我要做的是从呼叫记录中获取呼叫记录，将其传递到我的数据库进行存储，然后在需要显示时检索值。
DB已创建，但看起来值拒绝插入。下面是我的代码和logcat。
非常感谢帮助。
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);
}
我的数据库
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;
}
}
，最后是我的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！
答案 0 :(得分：1)
在cv更改为ContentValues cv = new ContentValues();
您需要CallRecords
public CallRecords(Context context)
{
this.context = context;
}
更改CallRecords recdb = new CallRecords();
至CallRecords recdb = new CallRecords(this);