我在申请时遇到了交易问题。简而言之，我正在构建一个程序来检索呼叫记录。这在模拟器上工作得很好，但不幸的是，当我在手机上尝试这个有大约300个通话记录时，需要超长时间！我读到创建单个事务会加快速度。但是，当我尝试这个时，我最终得到以下错误。现在我认为这可能只是我放置括号和我的endtransaction命令的问题，但我无法弄清楚这一点。 log cat上的错误似乎没有提供比指向该行更多的信息，并告诉我它是一个null异常。请在下面找到代码和错误日志。如果需要，将公布其他详细信息。
谢谢你！我的主屏幕。
@SuppressWarnings({ "deprecation", "deprecation" })
public class EtiMainScreen extends TabActivity {
CallRecords recdb = new CallRecords(EtiMainScreen.this);
SQLiteDatabase calllog;
Context c = this;
Handler hand = new Handler();
TextView tvnatbun, tvnatrate, tvnatsms, tvintmbun, tvintmrate, tvsmsbun,
tvsmsrate, tvintsmsrate, tvdatalbun, tvdatalrate, tvpackname,
tvTotal;
private long mStartRX = 0;
private long mStartTX = 0;
@SuppressWarnings("deprecation")
protected void onCreate(Bundle Bundle) {
super.onCreate(Bundle);
setContentView(R.layout.eti_main_screen);
super.onCreate(Bundle);
TabHost tabHost = getTabHost();
TabHost.TabSpec spec = getTabHost().newTabSpec("tag1");
spec.setContent(R.id.mainmenu);
spec.setIndicator("Main Menu");
getTabHost().addTab(spec);
getTabHost().setCurrentTab(0);
spec = getTabHost().newTabSpec("tag2");
spec.setContent(R.id.billhist);
spec.setIndicator("Billing History");
getTabHost().addTab(spec);
for (int i = 0; i < tabHost.getTabWidget().getChildCount(); i++) {
TextView tv = (TextView) tabHost.getTabWidget().getChildAt(i)
.findViewById(android.R.id.title);
tv.setTextColor(Color.parseColor("#FFFFFF"));
}
TextView tv = (TextView) tabHost.getCurrentTabView().findViewById(
android.R.id.title);
tv.setTextColor(Color.parseColor("#FFFFFF"));
((Button) findViewById(R.id.alert))
.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent localIntent = new
Intent(EtiMainScreen.this,
Alerts.class);
EtiMainScreen.this.startActivity(localIntent);
}
});
Uri SMSsentQuery = Uri.parse("content://sms/sent");
Cursor cursor1 = getContentResolver().query(SMSsentQuery, null, null,
null, null);
Cursor managedCursor = getContentResolver().query(
android.provider.CallLog.Calls.CONTENT_URI, null,
null,null,null);
mStartRX = TrafficStats.getMobileRxBytes();
mStartTX = TrafficStats.getMobileTxBytes();
long Totalbytes = mStartRX + mStartTX;
Log.v("", Long.toString(mStartRX));
Log.v("", Long.toString(mStartTX));
Log.v("", Long.toString(Totalbytes));
// int usage = Long.bitCount(Totalbytes) / 1024;
calllog.beginTransaction();
try {
while (managedCursor.moveToNext()) {
calllog.yieldIfContendedSafely();
String callNumber = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.NUMBER));
String callType = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.TYPE));
String callDur = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.DURATION));
int dateId = managedCursor
.getColumnIndex(android.provider.CallLog.Calls.DATE);
long callDate = managedCursor.getLong(dateId);
SimpleDateFormat datePattern = new SimpleDateFormat(
"yyyy-MM-dd HH:mm");
String date_str = datePattern.format(new Date(callDate));
int dircode = Integer.parseInt(callType);
float value = Float.parseFloat(callDur);
float callDuration = value / 60;
recdb.open();
ContentValues cv = new ContentValues();
if (dircode == CallLog.Calls.OUTGOING_TYPE) {
if (callNumber.startsWith("00971")
|| callNumber.startsWith("05")
|| callNumber.startsWith("04")
|| callNumber.startsWith("03")
|| callNumber.startsWith("02")) {
cv.put("cnatdur", callDuration);
} else {
cv.put("cintdur", callDuration);
}
}
int natsms = 0, intsms = 0;
while (cursor1.moveToNext()) {
String address = cursor1.getString(cursor1
.getColumnIndex("address"));
if (address.startsWith("009-71")
|| address.startsWith("(05")
|| address.startsWith("05")) {
natsms++;
cv.put("natsms", natsms);
} else {
intsms++;
cv.put("intsms", intsms);
}
cv.put("cdate", date_str);
cv.put("localdata", Totalbytes);
recdb.insertValues("records", cv);
recdb.insertCalc();
recdb.close();
}
cursor1.close();
}
managedCursor.close();
calllog.setTransactionSuccessful();
} catch (Exception e) {
}
calllog.endTransaction();
// alertCheck();9
tvpackname = (TextView) findViewById(R.id.packname);
tvnatbun = (TextView) findViewById(R.id.tvnatmbun);
tvnatrate = (TextView) findViewById(R.id.tvnatmrate);
tvintmbun = (TextView) findViewById(R.id.tvinmbun);
tvintmrate = (TextView) findViewById(R.id.tvintmrate);
tvsmsbun = (TextView) findViewById(R.id.tvnatsmsbun);
tvsmsrate = (TextView) findViewById(R.id.tvnatsmsrate);
tvintsmsrate = (TextView) findViewById(R.id.tvintsmsrate);
tvdatalbun = (TextView) findViewById(R.id.tvdlocbun);
tvdatalrate = (TextView) findViewById(R.id.tvdlocrate);
tvTotal = (TextView) findViewById(R.id.tvtotal);
ArrayList<Object> row;
row = recdb.callrecord(tvnatrate.getText().toString());
tvpackname.setText((String) row.get(0));
tvnatbun.setText((String) row.get(1));
tvnatrate.setText((String) row.get(2));
tvintmbun.setText((String) row.get(3));
tvintmrate.setText((String) row.get(4));
tvsmsbun.setText((String) row.get(5));
tvsmsrate.setText((String) row.get(6));
tvintsmsrate.setText((String) row.get(7));
tvdatalbun.setText((String) row.get(8));
tvdatalrate.setText((String) row.get(9));
tvTotal.setText((String) row.get(10));
recdb.close();
}
public void alertCheck() {
Alerts al = new Alerts();
ArrayList<Object> alertarr;
alertarr = al.alerttype(toString());
String a = ((String) alertarr.get(0));
String b = ((String) alertarr.get(2));
int aletot = Integer.parseInt(a);
int allimit = Integer.parseInt(b);
if (aletot >= (allimit * 50 / 100) && aletot < (allimit * 75 / 100)) {
AlertDialog.Builder alert1 = new AlertDialog.Builder(this);
alert1.setTitle("Warning! Usage - 50%");
alert1.setMessage("Your total usage is now at 50%");
alert1.show();
alert1.setPositiveButton("OK", null);
}
if (aletot >= (allimit * 75 / 100) && aletot < (allimit * 100 / 100)) {
AlertDialog.Builder alert2 = new AlertDialog.Builder(this);
alert2.setTitle("Warning! Usage - 75%");
alert2.setMessage("Your total usage is now at 75%");
alert2.show();
alert2.setPositiveButton("OK", null);
}
if (aletot >= (allimit * 100 / 100)) {
AlertDialog.Builder alert3 = new AlertDialog.Builder(this);
alert3.setTitle("Critical - Usage - 100%");
alert3.setMessage("You have now reached your total usage limit!");
alert3.show();
alert3.setPositiveButton("OK", null);
}
}
}
LogCat：
05-25 18:36:08.715: E/AndroidRuntime(15647): FATAL EXCEPTION: main
05-25 18:36:08.715: E/AndroidRuntime(15647): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mbf/com.example.mobilebillforecaster.EtiMainScreen}: java.lang.NullPointerException
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.os.Looper.loop(Looper.java:137)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread.main(ActivityThread.java:5039)
05-25 18:36:08.715: E/AndroidRuntime(15647): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 18:36:08.715: E/AndroidRuntime(15647): at java.lang.reflect.Method.invoke(Method.java:511)
05-25 18:36:08.715: E/AndroidRuntime(15647): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-25 18:36:08.715: E/AndroidRuntime(15647): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-25 18:36:08.715: E/AndroidRuntime(15647): at dalvik.system.NativeStart.main(Native Method)
05-25 18:36:08.715: E/AndroidRuntime(15647): Caused by: java.lang.NullPointerException
05-25 18:36:08.715: E/AndroidRuntime(15647): at com.example.mobilebillforecaster.EtiMainScreen.onCreate(EtiMainScreen.java:111)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.Activity.performCreate(Activity.java:5104)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-25 18:36:08.715: E/AndroidRuntime(15647): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-25 18:36:08.715: E/AndroidRuntime(15647): ... 11 more
感谢，
所以我继续并添加了在Async任务上运行的代码。但是，我在尝试执行时遇到以下错误。
05-30 21:41:10.353: E/AndroidRuntime(7221): FATAL EXCEPTION: AsyncTask #1
05-30 21:41:10.353: E/AndroidRuntime(7221): java.lang.RuntimeException: An error occured while executing doInBackground()
05-30 21:41:10.353: E/AndroidRuntime(7221): at android.os.AsyncTask$3.done(AsyncTask.java:299)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
05-30 21:41:10.353: E/AndroidRuntime(7221): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.lang.Thread.run(Thread.java:856)
05-30 21:41:10.353: E/AndroidRuntime(7221): Caused by: java.lang.NullPointerException
05-30 21:41:10.353: E/AndroidRuntime(7221): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:99)
05-30 21:41:10.353: E/AndroidRuntime(7221): at com.example.mobilebillforecaster.EtiMainScreen$callDataThread.doInBackground(EtiMainScreen.java:188)
05-30 21:41:10.353: E/AndroidRuntime(7221): at com.example.mobilebillforecaster.EtiMainScreen$callDataThread.doInBackground(EtiMainScreen.java:1)
05-30 21:41:10.353: E/AndroidRuntime(7221): at android.os.AsyncTask$2.call(AsyncTask.java:287)
05-30 21:41:10.353: E/AndroidRuntime(7221): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
05-30 21:41:10.353: E/AndroidRuntime(7221): ... 4 more
编码
MainScreen
package com.example.mobilebillforecaster;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.app.TabActivity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.net.TrafficStats;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.CallLog;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TextView;
import com.example.mbf.R;
@SuppressWarnings({ "deprecation", "deprecation" })
public class EtiMainScreen extends TabActivity {
CallRecords recdb = new CallRecords(this);
SQLiteDatabase calls;
Context c = this;
private TextView tvnatbun = null;
private TextView tvnatrate = null;
private TextView tvnatsms = null;
private TextView tvintmbun = null;
private TextView tvintmrate = null;
private TextView tvsmsbun = null;
private TextView tvsmsrate = null;
private TextView tvintsmsrate = null;
private TextView tvdatalbun = null;
private TextView tvdatalrate = null;
private TextView tvpackname = null;
private TextView tvTotal = null;
private long mStartRX = 0;
private long mStartTX = 0;
@SuppressWarnings("deprecation")
protected void onCreate(Bundle Bundle) {
super.onCreate(Bundle);
setContentView(R.layout.eti_main_screen);
initWidgets();
TabHost tabHost = getTabHost();
TabHost.TabSpec spec = getTabHost().newTabSpec("tag1");
spec.setContent(R.id.mainmenu);
spec.setIndicator("Main Menu");
getTabHost().addTab(spec);
getTabHost().setCurrentTab(0);
spec = getTabHost().newTabSpec("tag2");
spec.setContent(R.id.billhist);
spec.setIndicator("Billing History");
getTabHost().addTab(spec);
for (int i = 0; i < tabHost.getTabWidget().getChildCount(); i++) {
TextView tv = (TextView) tabHost.getTabWidget().getChildAt(i)
.findViewById(android.R.id.title);
tv.setTextColor(Color.parseColor("#FFFFFF"));
}
TextView tv = (TextView) tabHost.getCurrentTabView().findViewById(
android.R.id.title);
tv.setTextColor(Color.parseColor("#FFFFFF"));
((Button) findViewById(R.id.alert))
.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent localIntent = new Intent(EtiMainScreen.this,
Alerts.class);
EtiMainScreen.this.startActivity(localIntent);
}
});
// alertCheck();
recdb.open();
ArrayList<Object> row;
row = recdb.callrecord(tvnatrate.getText().toString());
tvpackname.setText((String) row.get(0));
tvnatbun.setText((String) row.get(1));
tvnatrate.setText((String) row.get(2));
tvintmbun.setText((String) row.get(3));
tvintmrate.setText((String) row.get(4));
tvsmsbun.setText((String) row.get(5));
tvsmsrate.setText((String) row.get(6));
tvintsmsrate.setText((String) row.get(7));
tvdatalbun.setText((String) row.get(8));
tvdatalrate.setText((String) row.get(9));
tvTotal.setText((String) row.get(10));
recdb.close();
}
private void initWidgets() {
tvpackname = (TextView) findViewById(R.id.packname);
tvnatbun = (TextView) findViewById(R.id.tvnatmbun);
tvnatrate = (TextView) findViewById(R.id.tvnatmrate);
tvintmbun = (TextView) findViewById(R.id.tvinmbun);
tvintmrate = (TextView) findViewById(R.id.tvintmrate);
tvsmsbun = (TextView) findViewById(R.id.tvnatsmsbun);
tvsmsrate = (TextView) findViewById(R.id.tvnatsmsrate);
tvintsmsrate = (TextView) findViewById(R.id.tvintsmsrate);
tvdatalbun = (TextView) findViewById(R.id.tvdlocbun);
tvdatalrate = (TextView) findViewById(R.id.tvdlocrate);
tvTotal = (TextView) findViewById(R.id.tvtotal);
}
public void alertCheck() {
Alerts al = new Alerts();
ArrayList<Object> alertarr;
alertarr = al.alerttype(toString());
String a = ((String) alertarr.get(0));
String b = ((String) alertarr.get(2));
int aletot = Integer.parseInt(a);
int allimit = Integer.parseInt(b);
if (aletot >= (allimit * 50 / 100) && aletot < (allimit * 75 / 100)) {
AlertDialog.Builder alert1 = new AlertDialog.Builder(this);
alert1.setTitle("Warning! Usage - 50%");
alert1.setMessage("Your total usage is now at 50%");
alert1.show();
alert1.setPositiveButton("OK", null);
}
if (aletot >= (allimit * 75 / 100) && aletot < (allimit * 100 / 100)) {
AlertDialog.Builder alert2 = new AlertDialog.Builder(this);
alert2.setTitle("Warning! Usage - 75%");
alert2.setMessage("Your total usage is now at 75%");
alert2.show();
alert2.setPositiveButton("OK", null);
}
if (aletot >= (allimit * 100 / 100)) {
AlertDialog.Builder alert3 = new AlertDialog.Builder(this);
alert3.setTitle("Critical - Usage - 100%");
alert3.setMessage("You have now reached your total usage limit!");
alert3.show();
alert3.setPositiveButton("OK", null);
}
}
public class callDataThread extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
// callRecordsHelper recdb =
// callRecordsHelper.getDBAdapterInstance(EtiMainScreen.this);
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
Uri SMSsentQuery = Uri.parse("content://sms/sent");
Cursor cursor1 = getContentResolver().query(SMSsentQuery, null,
null, null, null);
Cursor managedCursor = getContentResolver().query(
android.provider.CallLog.Calls.CONTENT_URI, null, null,
null, null);
mStartRX = TrafficStats.getMobileRxBytes();
mStartTX = TrafficStats.getMobileTxBytes();
long Totalbytes = mStartRX + mStartTX;
Log.v("", Long.toString(mStartRX));
Log.v("", Long.toString(mStartTX));
Log.v("", Long.toString(Totalbytes));
int usage = Long.bitCount(Totalbytes) / 1024;
recdb.open();
// calls.beginTransaction();
// try {
if (managedCursor != null && managedCursor.moveToFirst()) {
do {
String callNumber = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.NUMBER));
String callType = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.TYPE));
String callDur = managedCursor.getString(managedCursor
.getColumnIndex(CallLog.Calls.DURATION));
int dateId = managedCursor
.getColumnIndex(android.provider.CallLog.Calls.DATE);
long callDate = managedCursor.getLong(dateId);
SimpleDateFormat datePattern = new SimpleDateFormat(
"yyyy-MM-dd HH:mm");
String date_str = datePattern.format(new Date(callDate));
int dircode = Integer.parseInt(callType);
float value = Float.parseFloat(callDur);
float callDuration = value / 60;
// calls.yieldIfContendedSafely();
ContentValues cv = new ContentValues();
if (dircode == CallLog.Calls.OUTGOING_TYPE) {
if (callNumber.startsWith("00971")
|| callNumber.startsWith("05")
|| callNumber.startsWith("04")
|| callNumber.startsWith("03")
|| callNumber.startsWith("02")) {
cv.put("cnatdur", callDuration);
} else {
cv.put("cintdur", callDuration);
}
}
int natsms = 0, intsms = 0;
if (cursor1 != null && cursor1.moveToFirst()) {
do {
String address = cursor1.getString(cursor1
.getColumnIndex("address"));
if (address.startsWith("009-71")
|| address.startsWith("(05")
|| address.startsWith("05")) {
natsms++;
cv.put("natsms", natsms);
} else {
intsms++;
cv.put("intsms", intsms);
}
cv.put("cdate", date_str);
cv.put("localdata", usage);
recdb.insertValues("records", cv);
recdb.insertCalc();
recdb.close();
} while (cursor1.moveToNext());
cursor1.close();
}
} while (managedCursor.moveToNext());
managedCursor.close();
}
// calls.setTransactionSuccessful();
// } finally {
// calls.endTransaction();
// }
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}
}
非常感谢任何协助。
感谢
答案 0 :(得分：0)
我建议将callog.endtransaction()包裹在finally {}块中。
} catch (Exception e) {
} finally {
calllog.endTransaction();
}
我还建议不要在UI线程上运行这种查询，而是使用AsyncTask或AsyncTaskLoader
http://developer.android.com/reference/android/os/AsyncTask.html http://developer.android.com/reference/android/content/AsyncTaskLoader.html