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POHow to disable invalidate()?
 

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  1. POHow to disable invalidate()?
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    <p>At first my programm looks like this:</p> <p><img src="https://i.stack.imgur.com/UzNlO.jpg" alt="enter image description here"></p> <p>But when i am moving the picture around the screen programm turns to:</p> <p><img src="https://i.stack.imgur.com/YmNKF.jpg" alt="enter image description here"></p> <p>Red graph is random-generated in onDraw method. So i want to draging picture around and have static background that not inavalidates while im moving picture.</p> <p>here is my code: <strong>Custom View:</strong> package com.graph.base;</p> <pre><code>import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.util.AttributeSet; import android.view.View; import java.util.Random; public class CustomView extends View { Random random=new Random(); public CustomView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public CustomView(Context context, AttributeSet attrs) { super(context, attrs); } public CustomView(Context context) { super(context); } public void onDraw (Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setStyle(Paint.Style.FILL); paint.setColor(Color.WHITE); canvas.drawPaint(paint); Path path=new Path(); path.moveTo(10, 10); for (float i=0.5f; i&lt;=140; i+=10) { path.quadTo(10+i*5, 10+random.nextInt(500), 10+(i+10)*5, 10+random.nextInt(500)); } paint.setDither(true); paint.setColor(Color.RED); paint.setStyle(Paint.Style.STROKE); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStrokeWidth(2); canvas.drawPath(path, paint); } </code></pre> <p>}</p> <p><strong>MainActivity</strong></p> <pre><code>package com.graph.base; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.FrameLayout; import android.widget.ImageView; public class MainActivity extends Activity { FrameLayout frame; ImageView image; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); frame=(FrameLayout)findViewById(R.id.frameLayout1); image=(ImageView)findViewById(R.id.imageView1); image.setOnTouchListener(new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { Log.e("TAG", "Touch happend"); switch (event.getAction()) { case MotionEvent.ACTION_MOVE: { image.setPadding((int)event.getX(), (int)event.getY(), 0, 0); break; } } return true; } }); } public void invalidateButton_Click (View v) { frame.invalidate(); } } </code></pre>
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