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POPainting by touchscreen skips (discontiguous lines)
 

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    <p>My Activity Class file:</p> <pre><code>package com.drawing.test; import android.app.Activity; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.LinearLayout; public class TstActivity extends Activity implements OnTouchListener { float x1 = 0, y1 = 0, x2 = 0, y2 = 0; public static boolean action=false; private Bitmap mBitmap; private Canvas mCanvas; private Paint mBitmapPaint; Drawer mDrawer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LinearLayout mLinearLayout = (LinearLayout) findViewById(R.id.drawView); mLinearLayout.setOnTouchListener((OnTouchListener) this); mLinearLayout.addView(new Drawer(this)); } public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: x1 = event.getX(); y1 = event.getY(); action=false; //v.invalidate(); return true; case MotionEvent.ACTION_MOVE: x1=x2; y1=y2; x2 = event.getX(); y2 = event.getY(); v.invalidate(); action=true; return true; case MotionEvent.ACTION_UP: x2 = event.getX(); y2 = event.getY(); v.invalidate(); action=true; return true; } return false; } public class Drawer extends View { public Drawer(Context context) { super(context); mBitmap = Bitmap.createBitmap(400, 800, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mBitmap); mBitmapPaint = new Paint(Paint.DITHER_FLAG); mBitmapPaint.setColor(Color.MAGENTA); invalidate(); } protected void onDraw(Canvas canvas) { if(x1==x2 &amp;&amp; y1==y2)return; Paint p = new Paint(); // Canvas mCanvas1=new Canvas(mBitmap); p.setColor(Color.parseColor("#7CFC00")); canvas.drawBitmap(mBitmap, 0, 0, p); // canvas.drawLine(x1, y1, x2 , y2, p); p.setColor(Color.RED); // mCanvas1.drawLine(x1, y1, x2, y2,p); if(action==true)mCanvas.drawLine(x1, y1, x2, y2, mBitmapPaint); } } } </code></pre> <p>My Layout XML:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/drawView"&gt; &lt;/LinearLayout&gt; </code></pre> <p>When I try this out on emulator, the line breaks in middle but continues drawing. I tried on device too, and same problems happen but lesser in number. Also, the display sometimes flickers, or goes completely blank. When its completely black, it comes back if I touch once.</p> <p>Is there anything wrong that I am doing, shall I change my approach. </p> <p>Any suggestions are appreciated. Thanks</p>
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    1. USkishu27
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    1. COSee my answer, but please improve your title :) I suggested one
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    2. COthanks... I would have put on a similar title, but I couldn't figure out what is the technical problem :)
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      1. USkishu27
 

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