嘿，我正在尝试在我的 Android 应用程序上实现一项服务。 Service 必须执行与 Activity 相同的任务。 IE，如果 CallLog.Calls 内容提供者发生一些变化，即使应用程序没有运行，也必须通知服务并将数据插入数据库，我的意思是，应用程序启动后服务将运行，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，对吧？

因此它将在后台运行，收集 CallLog.Calls 服务上发生变化的所有数据。但是，该服务没有运行。我在 Activity 的 onCreate() 方法中加注星标。在服务内部，我实现了一个 ContentObserver 类，该类使用 onChange() 方法，以防 CallLog.Calls 内容提供程序发生某些变化。

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

这是代码。

名为 RatedCalls.java 的 Activity

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));

}

 }

最佳答案

只要看看你是否在你的 list 文件中添加了这个服务......

谢谢......

关于Android 应用程序不启动服务，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4520850/