2
嘿，我試圖在我的Android應用程序上實現一項服務。服務必須完成活動的相同任務。 IE，如果CallLog.Calls內容提供者發生了一些變化，那麼即使應用程序沒有運行，也必須通知服務並將數據插入數據庫中，也就是說，應用程序啓動後服務將運行，因此如果應用程序被終止，服務將繼續運行，直到操作系統停止它，對吧？Android應用程序無法啓動服務
因此，它將在後臺運行，收集所有在CallLog.Calls服務中更改的數據。但是，該服務沒有運行。我將它放在Activity的onCreate（）方法中。在服務內部，我實現了一個ContentObserver類，該類使用onChange（）方法來防止CallLog.Calls內容提供者發生某些變化。
我不知道服務未啓動的原因，以及爲什麼即使我在DDMS視角中殺死應用程序也無法正常工作。
這是代碼。
的活動稱爲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));
}
而且這是服務稱爲RatedCallsService.java
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));
}
}