उपयोगकर्ता इशारा पहचान

पूर्व उत्पादन

आवेदन आधार

import android.os.Bundle; import android.app.Activity; public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new ApplicationView(this)); } } 

 import android.view.View; import android.content.Context; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Canvas; public class ApplicationView extends View { Paint paint = new Paint(); //  ,  static float density; public ApplicationView(Context context) { super(context); density = getResources().getDisplayMetrics().density; this.setBackgroundColor(Color.GRAY); //     paint.setStrokeWidth(5*density); //     5dp } @Override protected void onDraw(Canvas canvas) { } } 

 Canvas canvas; //  Bitmap image; //   float zoom = 500; //    Point position = new Point(50, 50); //   

 image = Bitmap.createBitmap(500, 500, Config.ARGB_4444); //    canvas = new Canvas(image); //   canvas.drawColor(Color.WHITE); //     

 canvas.translate(position.x, position.y); //   canvas.scale(zoom / 500, zoom / 500); //     canvas.drawBitmap(image, 0, 0, paint); //   

 <activity android:name=".MainActivity" android:label="@string/title_activity_main" android:screenOrientation="landscape"> 

 <resources> <style name="AppTheme" parent="android:Theme.Light.NoTitleBar.Fullscreen" /> </resources> 

 <resources> <style name="AppTheme" parent="android:Theme.Holo.Light.NoActionBar.Fullscreen" /> </resources> 

 <resources> <style name="AppTheme" parent="android:Theme.DeviceDefault.Light.NoActionBar.Fullscreen" /> </resources> 

टच स्क्रीन के साथ काम का अहसास

 ArrayList<Finger> fingers = new ArrayList<Finger>(); //  ,    @Override public boolean onTouchEvent(MotionEvent event) { int id = event.getPointerId(event.getActionIndex()); //   int action = event.getActionMasked(); //  if(action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_POINTER_DOWN) fingers.add(event.getActionIndex(), new Finger(id, (int)event.getX(), (int)event.getY())); else if(action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP) fingers.remove(fingers.get(event.getActionIndex())); //  ,    else if(action == MotionEvent.ACTION_MOVE){ for(int n = 0; n < fingers.size(); n++){ //     fingers.get(n).setNow((int)event.getX(n), (int)event.getY(n)); } //checkGestures(); invalidate(); } return true; } 

 import android.graphics.Point; public class Finger { public int ID; //   public Point Now; public Point Before; boolean enabled = false; //      public Finger(int id, int x, int y){ ID = id; Now = Before = new Point(x, y); } public void setNow(int x, int y){ if(!enabled){ enabled = true; Now = Before = new Point(x, y); }else{ Before = Now; Now = new Point(x, y); } } } 

 canvas.restore(); //      for(int i = 0; i < fingers.size(); i++){ //       canvas.drawCircle(fingers.get(i).Now.x, fingers.get(i).Now.y, 40 * density, paint); } 

चल रहा कैनवास

 public void checkGestures(){ Finger point = fingers.get(0); //    position.x += point.Now.x - point.Before.x; //   position.y += point.Now.y - point.Before.y; } 

दूरी को कैनवास में बदलें

 Finger point = fingers.get(0); if(fingers.size() > 1){ // Multitouch //     (now)   (before) float now = checkDistance(point.Now, fingers.get(1).Now); float before = checkDistance(point.Before, fingers.get(1).Before); float oldSize = zoom; //     zoom = Math.max(now - before + zoom, density * 25); //     position.x -= (zoom - oldSize) / 2; //    position.y -= (zoom - oldSize) / 2; }else{ //   position.x += point.Now.x - point.Before.x; position.y += point.Now.y - point.Before.y; } 

 static float checkDistance(Point p1, Point p2){ //       return FloatMath.sqrt((p1.x - p2.x)*(p1.x - p2.x)+(p1.y - p2.y)*(p1.y - p2.y)); } 

मोड में बदलाव

1. हम onDraw मेथड में अपना कोड लिखते हैं;
2. हम अपना कोड onTouchEvent में लिखते हैं;
3. हम एक टाइमर बनाते हैं और उसमें कोड लिखते हैं;
4. हम एक हैंडलर बनाते हैं और पोस्टडेलिड पद्धति का उपयोग करके अपने रननेबल को कॉल करते हैं;

 handler.postDelayed(longPress, 1000); 

 Runnable longPress = new Runnable() { public void run() { } }; 

 import android.graphics.Point; public class Finger { public int ID; public Point Now; public Point Before; public long wasDown; boolean enabled = false; public boolean enabledLongTouch = true; Point startPoint; public Finger(int id, int x, int y){ wasDown = System.currentTimeMillis(); ID = id; Now = Before = startPoint = new Point(x, y); } public void setNow(int x, int y){ if(!enabled){ enabled = true; Now = Before = startPoint = new Point(x, y); }else{ Before = Now; Now = new Point(x, y); if(ApplicationView.checkDistance(Now, startPoint) > ApplicationView.density * 25) enabledLongTouch = false; } } } 

 if(fingers.size() > 0 && fingers.get(0).enabledLongTouch){ fingers.get(0).enabledLongTouch = false; drawingMode = !drawingMode; vibrator.vibrate(80); } 

 vibrator = (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE); 

 <uses-permission android:name="android.permission.VIBRATE"/> 

 vibrator.vibrate(80); 

ड्राइंग

 Finger finger = fingers.get(0); if(fingers.size() > 1){ float now = checkDistance(finger.Now, fingers.get(1).Now); float before = checkDistance(finger.Before, fingers.get(1).Before); if(!drawingMode){ float oldSize = zoom; zoom = Math.max(now - before + zoom, density * 25); position.x -= (zoom - oldSize) / 2; position.y -= (zoom - oldSize) / 2; }else paint.setStrokeWidth(paint.getStrokeWidth() + (now - before) / 8); }else{ if(!drawingMode){ position.x += finger.Now.x - finger.Before.x; position.y += finger.Now.y - finger.Before.y; }else{ float x1 = (finger.Before.x-position.x)*500/zoom; //   float x2 = (finger.Now.x-position.x)*500/zoom; //    float y1 = (finger.Before.y-position.y)*500/zoom; //   float y2 = (finger.Now.y-position.y)*500/zoom; canvas.drawLine(x1, y1, x2, y2, paint); //   canvas.drawCircle(x1, y1, paint.getStrokeWidth() / 2, paint); //   canvas.drawCircle(x2, y2, paint.getStrokeWidth() / 2, paint); cursor = finger.Now; } } 

 if(drawingMode){ int old = paint.getColor(); //    paint.setColor(Color.GRAY); //     canvas.drawCircle((cursor.x-position.x)*500/zoom, (cursor.y-position.y)*500/zoom, paint.getStrokeWidth() / 2, paint); //      paint.setColor(old); //    } 

रंग बीनने वाला

 int id = event.getPointerId(event.getActionIndex()); int action = event.getActionMasked(); if(action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_POINTER_DOWN) fingers.add(event.getActionIndex(), new Finger(id, (int)event.getX(), (int)event.getY())); else if(action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP){ Finger finger = fingers.get(event.getActionIndex()); //    //     100,       200, //             25dp if(System.currentTimeMillis() - finger.wasDown < 100 && finger.wasDown - lastTapTime < 200 && finger.wasDown - lastTapTime > 0 && checkDistance(finger.Now, lastTapPosition) < density * 25){ //     } lastTapTime = System.currentTimeMillis(); //     lastTapPosition = finger.Now; //     fingers.remove(fingers.get(event.getActionIndex())); }else if(action == MotionEvent.ACTION_MOVE){ for(int n = 0; n < fingers.size(); n++){ fingers.get(n).setNow((int)event.getX(n), (int)event.getY(n)); } checkGestures(); } return true; 

 Builder builder = new AlertDialog.Builder(getContext()); String[] items = {"", "", "", "", "", "", "", ""}; final AlertDialog dialog = builder.setTitle("  ").setItems(items, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { int[] colors = {Color.RED, Color.GREEN, Color.BLUE, 0xFF99CCFF, Color.BLACK, Color.WHITE, Color.YELLOW, 0xFFFFCC99}; paint.setColor(colors[which]); } }).create(); dialog.show(); 

निष्कर्ष