How to refresh call log

Question

I'm trying to refresh the call log once a button is pressed. I have both a Uri and Cursor defined

Cursor c;
Uri allCalls = Uri.parse("content://call_log/calls");

and then this function is called in onCreate

public void checkLogs() {
    c = getContentResolver().query(allCalls, null, null, null, sOrder);

    while (c.moveToNext()) {
        num = c.getString(c.getColumnIndex(CallLog.Calls.NUMBER)); // for
                                                                    // number
        if (num.startsWith("+1")) {
            num = num.substring(2);
        }
        name = c.getString(c.getColumnIndex(CallLog.Calls.CACHED_NAME)); // for
                                                                            // name
        type = Integer.parseInt(c.getString(c
                .getColumnIndex(CallLog.Calls.TYPE))); // for type

        if (type == 3 && arrlst.contains(num) == false && name == null) {
            arrlst.add(num);
            initialize(num);
        }

        else {
            arrlst.add(num);
            continue;
        }
    }

    c.close();
}

This works, but I tried making a refresh button that contains the following code

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case (R.id.menuRefresh):
                allCalls = Uri.parse("content://call_log/calls");
                checkLogs();
    }
    return false;
}

when I press the refresh the new calls do not appear, but when I close and open the application they appear. What am I doing wrong?

Error log when trying to use Loader

05-25 02:31:14.724: E/AndroidRuntime(18892): FATAL EXCEPTION: main
05-25 02:31:14.724: E/AndroidRuntime(18892): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.callfinder/com.example.callfinder.FindCalls}: java.lang.NullPointerException
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2356)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread.access$600(ActivityThread.java:150)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.os.Looper.loop(Looper.java:137)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread.main(ActivityThread.java:5195)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at java.lang.reflect.Method.invokeNative(Native Method)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at java.lang.reflect.Method.invoke(Method.java:511)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at dalvik.system.NativeStart.main(Native Method)
05-25 02:31:14.724: E/AndroidRuntime(18892): Caused by: java.lang.NullPointerException
05-25 02:31:14.724: E/AndroidRuntime(18892):    at com.example.callfinder.FindCalls.checkLogs(FindCalls.java:171)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at com.example.callfinder.FindCalls.onCreate(FindCalls.java:55)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.Activity.performCreate(Activity.java:5104)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-25 02:31:14.724: E/AndroidRuntime(18892):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2260)
05-25 02:31:14.724: E/AndroidRuntime(18892):    ... 11 more

Also the code that I tried to explain if it was confusing in the comment

public void initialize() {
    layout = (LinearLayout) findViewById(R.id.ll1);
    tvTitle = (TextView) findViewById(R.id.textView1);
    lp = new LayoutParams(LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    sOrder = String.format(sDate + " %s", sSort);

    mAdapter = new SimpleCursorAdapter(this, R.layout.activity_find_calls,
            null, null, null, 0);
    getLoaderManager().initLoader(0, null, this);

}

@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
    return new CursorLoader(this, allCalls,
            null, null, null, sOrder);
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    switch (loader.getId()) {
      case 1:
          mAdapter.swapCursor(cursor);
          break;
    }

}

@Override
public void onLoaderReset(Loader<Cursor> arg0) {
    mAdapter.swapCursor(null);

}

and

    public void checkLogs() {
    c = mAdapter.getCursor();
    //c = getContentResolver().query(allCalls, null, null, null, sOrder);

    while (c.moveToNext()) {
        num = c.getString(c.getColumnIndex(CallLog.Calls.NUMBER)); // for
                                                                    // number
        if (num.startsWith("+1")) {
            num = num.substring(2);
        }
        name = c.getString(c.getColumnIndex(CallLog.Calls.CACHED_NAME)); // for
                                                                            // name
        type = Integer.parseInt(c.getString(c
                .getColumnIndex(CallLog.Calls.TYPE))); // for type

        if (type == 3 && arrlst.contains(num) == false && name == null) {
            arrlst.add(num);
            makeButton(num);
        }

        else {
            arrlst.add(num);
            continue;
        }
    }


}

Answer 1

Use a CursorLoader to query a cursor containing the call log records. The CursorLoader will automatically refresh when the call logs are modified so you will not have to worry about refreshing the display manually (if you did need to refresh manually though, you can do so calling the LoaderManager's restartLoader() method).

Answer 2

I actually got it to work with the following code

case (R.id.menuRefresh):
        allCalls = Uri.parse("content://call_log/calls");
        layout.removeAllViews();
        arrlst.clear();
        checkLogs();