Hello developers,
I have got a serious problem concerning the detection of gesture
events.
I have implemented my own gesture detector and have the following
problem:
When I pressed the touchscreen for a long time (onLongPress() is
called) and I keep touching the screen my application doesn't listen
to my touch events anymore. Do you maybe know why the touch events
don't get detected anymore after keeping the finger on the screen?
I want to implement a swipe gesture after keeping the finger on the
screen for a longer time (after onLongpress() is called). I hope you
understood my problem and here is my code:
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class GestureDetect extends Activity implements
OnGestureListener {
private LinearLayout main;
private TextView viewA;
boolean longPress;
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureScanner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
gestureScanner = new GestureDetector(this);
main = new LinearLayout(this);
main.setBackgroundColor(Color.GRAY);
main.setLayoutParams(new LinearLayout.LayoutParams(320, 480));
viewA = new TextView(this);
viewA.setBackgroundColor(Color.YELLOW);
viewA.setTextColor(Color.BLACK);
viewA.setTextSize(16);
viewA.setLayoutParams(new LinearLayout.LayoutParams(320, 80));
main.addView(viewA);
setContentView(main);
}
@Override
public boolean onTouchEvent(MotionEvent me) {
return gestureScanner.onTouchEvent(me);
}
@Override
public boolean onDown(MotionEvent e) {
viewA.setText("-" + "DOWN" + "-");
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float
velocityX,
float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(getApplicationContext(), "Left Swipe",
Toast.LENGTH_SHORT).show();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(getApplicationContext(), "Right Swipe",
Toast.LENGTH_SHORT).show();
} else if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(getApplicationContext(), "Swipe up",
Toast.LENGTH_SHORT).show();
} else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(getApplicationContext(), "Swipe down",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// nothing
}
return true;
}
@Override
public void onLongPress(MotionEvent e) {
Toast mToast = Toast.makeText(getApplicationContext(),"Long
Press",
Toast.LENGTH_SHORT);
mToast.show();
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float
distanceX,
float distanceY) {
viewA.setText("-" + "SCROLL" + "-");
return true;
}
@Override
public void onShowPress(MotionEvent e) {
viewA.setText("-" + "SHOW PRESS" + "-");
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
Toast mToast = Toast.makeText(getApplicationContext(), "Single
Tap",
Toast.LENGTH_SHORT);
mToast.show();
return true;
}
}
Best regards and thank you,
tsemann
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