嘿,我正在尝试在我的

Android应用程序上实现一项服务.服务必须执行活动的相同任务. IE,如果在CallLog.Calls内容提供程序上发生某些更改,则必须通知服务并将数据插入数据库,即使应用程序未运行,我的意思是,服务将在应用程序启动后运行,因此如果应用程序被杀死,服务将继续运行,直到操作系统停止它,对吧？

因此它将在后台运行,收集CallLog.Calls服务上更改的所有数据.但是,该服务没有运行.我在Activity的onCreate()方法中加注它.在Service中,我实现了一个ContentObserver类,它使用onChange()方法,以防CallLog.Calls内容提供程序中的某些更改.

我不知道的是为什么服务没有启动,以及为什么即使我在DDMS视角杀死应用程序它也不起作用.

这是代码.

该Activity名为RatedCalls.java

public class RatedCalls extends ListActivity {

private static final String LOG_TAG = "RATEDCALLSOBSERVER";

private Handler handler = new Handler();

private SQLiteDatabase db;

private CallDataHelper cdh;

StringBuilder sb = new StringBuilder();

OpenHelper openHelper = new OpenHelper(RatedCalls.this);

private Integer contentProviderLastSize;

private Integer contentProviderCurrentSize;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

cdh = new CallDataHelper(this);

db = openHelper.getWritableDatabase();

startService(new Intent(this, RatedCallsService.class));

registerContentObservers();

Log.i("FILLLIST", "calling from onCreate()");

Cursor cursor = getContentResolver().query(

android.provider.CallLog.Calls.CONTENT_URI, null, null, null,

android.provider.CallLog.Calls.DATE + " DESC ");

contentProviderLastSize = cursor.getCount();

}

class RatedCallsContentObserver extends ContentObserver {

public RatedCallsContentObserver(Handler h) {

super(h);

}

@Override

public boolean deliverSelfNotifications() {

return true;

}

@Override

public void onChange(boolean selfChange) {

Log.d(LOG_TAG, "RatedCallsContentObserver.onChange( " + selfChange

+ ")");

super.onChange(selfChange);

searchInsert();

}

}

private void searchInsert() {

Cursor cursor = getContentResolver().query(

android.provider.CallLog.Calls.CONTENT_URI, null, null, null,

android.provider.CallLog.Calls.DATE + " DESC ");

Log.i("FILLLIST", "Calling from searchInsert");

startManagingCursor(cursor);

int numberColumnId = cursor

.getColumnIndex(android.provider.CallLog.Calls.NUMBER);

int durationId = cursor

.getColumnIndex(android.provider.CallLog.Calls.DURATION);

int contactNameId = cursor

.getColumnIndex(android.provider.CallLog.Calls.CACHED_NAME);

int numTypeId = cursor

.getColumnIndex(android.provider.CallLog.Calls.CACHED_NUMBER_TYPE);

Date dt = new Date();

int hours = dt.getHours();

int minutes = dt.getMinutes();

int seconds = dt.getSeconds();

String currTime = hours + ":" + minutes + ":" + seconds;

SimpleDateFormat dateFormat = new SimpleDateFormat("M/dd/yyyy");

Date date = new Date();

cursor.moveToFirst();

String contactNumber = cursor.getString(numberColumnId);

String contactName = cursor.getString(contactNameId);

String duration = cursor.getString(durationId);

String numType = cursor.getString(numTypeId);

stopManagingCursor(cursor);

ContentValues values = new ContentValues();

values.put("contact_id", 1);

values.put("contact_name", contactName);

values.put("number_type", numType);

values.put("contact_number", contactNumber);

values.put("duration", duration);

values.put("date", dateFormat.format(date));

values.put("current_time", currTime);

values.put("cont", 1);

db.insert(CallDataHelper.TABLE_NAME, null, values);

}

public void registerContentObservers() {

this.getApplicationContext()

.getContentResolver()

.registerContentObserver(

android.provider.CallLog.Calls.CONTENT_URI, true,

new RatedCallsContentObserver(handler));

}

这就是名为RatedCallsService.java的服务

public class RatedCallsService extends Service {

private static final String TAG = "RatedCallsService";

private static final String LOG_TAG = "RatedCallsService";

private Handler handler = new Handler();

private SQLiteDatabase db;

private CallDataHelper cdh;

OpenHelper openHelper = new OpenHelper(RatedCallsService.this);

class RatedCallsContentObserver extends ContentObserver {

public RatedCallsContentObserver(Handler h) {

super(h);

}

@Override

public boolean deliverSelfNotifications() {

return true;

}

@Override

public void onChange(boolean selfChange) {

Log.d(LOG_TAG, "RatedCallsContentObserver.onChange( " + selfChange

+ ")");

super.onChange(selfChange);

searchInsert();

}

}

@Override

public IBinder onBind(Intent arg0) {

// TODO Auto-generated method stub

return null;

}

@Override

public void onCreate() {

Toast.makeText(this, "Rated Calls Service Created", Toast.LENGTH_LONG).show();

Log.i(TAG, "onCreate");

registerContentObservers();

}

@Override

public void onDestroy() {

Toast.makeText(this, "Rated Calls Service Stopped", Toast.LENGTH_LONG).show();

Log.i(TAG, "onDestroy");

cdh = new CallDataHelper(this);

db = openHelper.getWritableDatabase();

}

@Override

public void onStart(Intent intent, int startid) {

Toast.makeText(this, "Rated Calls Service Started", Toast.LENGTH_LONG).show();

Log.d(TAG, "onStart");

registerContentObservers();

}

private void searchInsert() {

Cursor cursor = getContentResolver().query(

android.provider.CallLog.Calls.CONTENT_URI, null, null, null,

android.provider.CallLog.Calls.DATE + " DESC ");

Log.i("FILLLIST", "Calling from searchInsert");

int numberColumnId = cursor

.getColumnIndex(android.provider.CallLog.Calls.NUMBER);

int durationId = cursor

.getColumnIndex(android.provider.CallLog.Calls.DURATION);

int contactNameId = cursor

.getColumnIndex(android.provider.CallLog.Calls.CACHED_NAME);

int numTypeId = cursor

.getColumnIndex(android.provider.CallLog.Calls.CACHED_NUMBER_TYPE);

Date dt = new Date();

int hours = dt.getHours();

int minutes = dt.getMinutes();

int seconds = dt.getSeconds();

String currTime = hours + ":" + minutes + ":" + seconds;

SimpleDateFormat dateFormat = new SimpleDateFormat("M/dd/yyyy");

Date date = new Date();

if (cursor.moveToFirst()) {

do {

String contactNumber = cursor.getString(numberColumnId);

String contactName = cursor.getString(contactNameId);

String duration = cursor.getString(durationId);

String numType = cursor.getString(numTypeId);

ContentValues values = new ContentValues();

values.put("contact_id", 1);

values.put("contact_name", contactName);

values.put("number_type", numType);

values.put("contact_number", contactNumber);

values.put("duration", duration);

values.put("date", dateFormat.format(date));

values.put("current_time", currTime);

values.put("cont", 1);

db.insert(CallDataHelper.TABLE_NAME, null, values);

} while (cursor.moveToNext());

cursor.close();

}

}

public void registerContentObservers() {

this.getApplicationContext()

.getContentResolver()

.registerContentObserver(

android.provider.CallLog.Calls.CONTENT_URI, true,

new RatedCallsContentObserver(handler));

}

}