嘿，我正在尝试在我的 Android 应用程序上实现一项服务。并且Service必须完成Activity的相同任务。IE，如果 CallLog.Calls 内容提供者发生一些变化，必须通知服务并将数据插入数据库中，即使应用程序没有运行，我的意思是，服务将在应用程序启动后运行，所以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，对吗？
因此它将在后台运行，收集所有在 CallLog.Calls 服务上发生变化的数据。但是，该服务没有运行。我将它放在 Activity 的 onCreate() 方法中。在服务内部，我实现了一个 ContentObserver 类，该类使用 onChange() 方法，以防 CallLog.Calls 内容提供者发生变化。
我不知道为什么服务没有启动，为什么即使我从 DDMS 角度杀死应用程序也无法正常工作。
这是代码。
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));
}
}