Question

I have make an app that can show missed call when screen is locked,but I don’t know how to show number of missed call on the locked screen.the call image is from MultiWaveViewwhich has defined already,I have trid using OnDraw,with Canvas and paint,draw the specify coordinate.but it doesn’t work .so anyone help me?thanks a lot.

how to show the number(e.g.in picture is position 2 )in the picutre?

edit1

for now I have get the right number of missed call in app,but it doesn’t show correctly

class:

framework\base\core\java\com\android\internal\widget\multiwaveview\MissedCallView.java

public class MissedCallView extends View {

private static final String TAG = "MissedCallViews";

public static final int UPDATESTART = 10;

private static final int DELAYTIME = 10000;

private int sTempMissedCallCount=-1;

Context mContext;

Canvas mCanvas;

public MissedCallView(Context context) 
{

super(context);

Log.i(TAG, "MissedCallView1");

mCanvas=new Canvas();

}

public MissedCallView(Context context, AttributeSet attrs)
{ 
super(context, attrs);

Log.i(TAG, "MissedCallView2");

mCanvas=new Canvas();

}

public MissedCallView(Context context,int missedCallNum) {

super(context);

sTempMissedCallCount=missedCallNum;

Log.i(TAG, "MissedCallView3");

mCanvas=new Canvas();

}

@Override 
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

if(sTempMissedCallCount>0)

{

Paint paint=new Paint(Paint.ANTIALIASFLAG); 
paint.setColor(Color.RED); Log.i(TAG,"Integer.toString(sTempMissedCallCount)is:"+Integer.toString(sTempMissedCallCount)); canvas.drawText(Integer.toString(sTempMissedCallCount),40,310,paint);//50 invalidate();

Log.i(TAG, "invalidate");

}

}

}

this is the custom view ,Only MissedCallView(Context context,int missedCallNum) works ,it called at public class MissCallObserver extends ContentObserver when listen the missed called number .but the onDraw doesn’t work ,so the app doesn’t show the number I have got.

EDIT2:

for now I call the function in my custom hanlder, handler do every 10 second

private final Handler mUpdateMissCallNum = new Handler() {
@Override
public void handleMessage(Message msg) {
Log.i(TAG, "mUpdateMissCallNum");
switch (msg.what) {
case UPDATESTART:

Log.i(TAG, "UPDATESTART");
sNewMissedCallCount = getMissedCallCount(mContext);
if (sNewMissedCallCount != sTempMissedCallCount)
{

Log.i(TAG, "sNewMissedCallCount != sTempMissedCallCount");
new Thread(new Runnable()
{
public void run()
{

Log.i(TAG, "sNewMissedCallCount is:"+sNewMissedCallCount);

Log.i(TAG, "sTempMissedCallCount is:"+sTempMissedCallCount);
sTempMissedCallCount = sNewMissedCallCount;
mMissedCallView=new MissedCallView(mContext,sTempMissedCallCount);
//call my costum view here
Log.i(TAG, "sTempMissedCallCount is:"+sTempMissedCallCount);
        }
        }
    ).start();
    }
    break;
    default:
    break;
    }
}
}

I draw it with canvas and paint,without XML files

then I　lock screen in XML:Keyguardscreentabunlock.xml (framework\base\core\res\res\layout).

which is use Ripple Lock in system:

<com.android.internal.widget.multiwaveview.MultiWaveView
android:id="@+id/unlockwidget"
android:orientation="horizontal"
android:layoutwidth="matchparent"
android:layoutheight="matchparent"
android:layout_alignParentBottom="true"
        android:targetDrawables="@array/lockscreen_targets_with_camera"
        android:targetDescriptions="@array/lockscreen_target_descriptions_with_camera"
        android:directionDescriptions="@array/lockscreen_direction_descriptions"
        android:handleDrawable="@drawable/ic_lockscreen_handle"
        android:waveDrawable="@drawable/ic_lockscreen_outerring"
        android:outerRadius="@dimen/multiwaveview_target_placement_radius"
        android:snapMargin="@dimen/multiwaveview_snap_margin"
        android:hitRadius="@dimen/multiwaveview_hit_radius"
        android:rightChevronDrawable="@drawable/ic_lockscreen_chevron_right"
        android:horizontalOffset="0dip"
        android:verticalOffset="60dip"
        android:feedbackCount="3"
        android:vibrationDuration="20"
        />

then I get this :

Now I want to show the missed call number on the center of the circle(in the picuture mouse position.),And I don’t know how to achieve.

Answer 1

you can make use of flag FLAG_SHOW_WHEN_LOCKED

for more information on lock screen My android lock

public static final int FLAG_SHOW_WHEN_LOCKED

Lines from API level 5

Window flag: special flag to let windows be shown when the screen is
locked. This will let application windows take precedence over key
guard or any other lock screens. Can be used with FLAG_KEEP_SCREEN_ON
to turn screen on and display windows directly before showing the key
guard window. Can be used with FLAG_DISMISS_KEYGUARD to automatically
fully dismisss non-secure keyguards

UPDATE1 for missed calls:

All you need is to query the phone for any calls then extract missed one & Then just get the count of rows in the Cursor that is return by the query

String[] projection = { CallLog.Calls.CACHED_NAME, CallLog.Calls.CACHED_NUMBER_LABEL, CallLog.Calls.TYPE };
       String where = CallLog.Calls.TYPE+"="+CallLog.Calls.MISSED_TYPE;          
       Cursor c = this.getContentResolver().query(CallLog.Calls.CONTENT_URI, selection,where, null, null);
       c.moveToFirst();    
       Log.d("CALL", ""+c.getCount()); //do some other operation
        if(c.getCount() == SOME_VALUE_TO_START_APP_ONE)

In the where clause you set condition for selection of data. In your case you need everything which type equals CallLog.Calls.MISSED_TYPE.

you can select the Name of the caller and his number, ofcourse you can specify more information to be queried like type of number like mobile, home, work.
The expression is equivalent to SQL query, something like:

SELECT CACHED_NAME, CACHED_NUMBER_LABEL, TYPE FROM CONTENT_URI WHERE TYPE=MISSED_TYPE

UPDATE2: how to show the 2 in the picutre .?

All you need to do is set the alarm string in the system settings, as follows:

String message = "2";
Settings.System.putString(context.getContentResolver(),
        Settings.System.NEXT_ALARM_FORMATTED, message);