Android implements graffiti, saves graffiti images, and clears the screen

The code for customizing the View class is as follows:

package com.xy.tuya;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;public class MyView extends View {private Paint paint = null;private Bitmap originalBitmap = null;private Bitmap new1Bitmap = null;private Bitmap new2Bitmap = null;private float clickX = 0, clickY = 0;private float startX = 0, startY = 0;private boolean isMove = true;private boolean isClear = false;private int color = Color.GREEN;private float strokeWidth = 2.0f;public MyView(Context context, AttributeSet attrs) {super(context, attrs);originalBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.a1).copy(Bitmap.Config.ARGB_8888, true);new1Bitmap = Bitmap.createBitmap(originalBitmap);setDrawingCacheEnabled(true);Log.i("RG", "new1Bitmap--->>>" + new1Bitmap);}public void clear() {isClear = true;new2Bitmap = Bitmap.createBitmap(originalBitmap);invalidate();}Bitmap saveImage = null;public Bitmap saveImage() {if (saveImage == null) {return null;}return saveImage;}public void setImge() {saveImage = null;}public void setstyle(float strokeWidth) {this.strokeWidth = strokeWidth;}Handler handler1;@SuppressLint("DrawAllocation")@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0, null);handler1 = new Handler() {@Overridepublic void handleMessage(Message msg) {Log.i("RG", "--------------------");int what = msg.what;if (what == 2) {saveImage = Bitmap.createBitmap(HandWriting(new1Bitmap));Message msg1 = new Message();msg1 = Message.obtain(MainActivity.hh, 3);MainActivity.hh.sendMessage(msg1);}super.handleMessage(msg);}};}@SuppressLint("HandlerLeak")Handler handler;public Bitmap HandWriting(Bitmap originalBitmap) {handler = new Handler() {@Overridepublic void handleMessage(Message msg) {int what = msg.what;if (what == 1) {startX = clickX;startY = clickY;}super.handleMessage(msg);}};Canvas canvas = null;if (isClear) {canvas = new Canvas(new2Bitmap);Log.i("RG", "canvas ");} else {canvas = new Canvas(originalBitmap);}paint = new Paint();paint.setStyle(Style.STROKE);paint.setAntiAlias(true);paint.setColor(color);paint.setStrokeWidth(strokeWidth);Log.i("RG", "startX-->>>>" + startX);Log.i("RG", "startY-->>>>" + startY);if (isMove) {canvas.drawLine(startX, startY, clickX, clickY, paint);}if (isClear) {return new2Bitmap;}return originalBitmap;}@Overridepublic boolean onTouchEvent(MotionEvent event) {Message msg = new Message();msg = Message.obtain(handler, 1);handler.sendMessage(msg);clickX = event.getX();clickY = event.getY();if (event.getAction() == MotionEvent.ACTION_DOWN) {isMove = false;invalidate();return true;} else if (event.getAction() == MotionEvent.ACTION_MOVE) {isMove = true;invalidate();return true;}return super.onTouchEvent(event);}}

The mainactiviry class code is as follows:

package com.xy.tuya;import android.opengl.Visibility;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.drawable.Drawable;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.support.v4.app.NavUtils;public class MainActivity extends Activity {/** Called when the activity is first created. */private MyView handWrite = null;private Button clear = null;private Button save = null;private ImageView saveImage = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);handWrite = (MyView) findViewById(R.id.handwriteview);save = (Button) findViewById(R.id.save);saveImage = (ImageView) findViewById(R.id.saveimage);clear = (Button) findViewById(R.id.clear);clear.setOnClickListener(new clearListener());save.setOnClickListener(new saveListener());handerl();}private class clearListener implements OnClickListener {public void onClick(View v) {handWrite.clear();}}static Handler hh;public void handerl() {hh = new Handler() {@Overridepublic void handleMessage(Message msg) {int what = msg.what;if (what == 3) {saveImage.setVisibility(View.VISIBLE);saveImage.setImageBitmap(handWrite.saveImage());handWrite.setImge();}super.handleMessage(msg);}};}private class saveListener implements OnClickListener {@Overridepublic void onClick(View v) {Message msg = new Message();msg = Message.obtain(handWrite.handler1, 2);handWrite.handler1.sendMessage(msg);if (handWrite.saveImage() != null) {Log.i("RG", "111111111111111111111");} else {saveImage.setVisibility(View.GONE);}}}}

The XML layout code is as follows:

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: Orientation = "vertical"> <linearlayout Android: layout_width = "fill_parent" Android: layout_height = "wrap_content"> <COM. ZTE. tuya. myview Android: Id = "@ + ID/handwriteview" Android: layout_width = "fill_parent" Android: layout_height = "300dp"/> </linearlayout> <linearlayout Android: layout_width = "wrap_content" Android: layout_height = "40dip" Android: Orientation = "horizontal"> <button Android: Id = "@ + ID/clear" Android: layout_width = "50dp" Android: layout_height = "wrap_content" Android: text = "clear screen"/> <button Android: Id = "@ + ID/Save" Android: layout_width = "50dp" Android: layout_height = "wrap_content" Android: text = "save"/> </linearlayout> <imageview Android: Id = "@ + ID/saveimage" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content"/> </linearlayout> is shown in the following figure:

You can add more functions, such as integrating all text messages to send ......