Android实现画画板案例

2023-08-29 14:03:04 58

packagecom.example.it; importandroid.content.Intent; importandroid.graphics.Bitmap; importandroid.graphics.BitmapFactory; importandroid.graphics.Canvas; importandroid.graphics.Color; importandroid.graphics.Matrix; importandroid.graphics.Paint; importandroid.net.Uri; importandroid.os.Environment; importandroid.os.SystemClock; importandroid.support.v7.app.AppCompatActivity; importandroid.os.Bundle; importandroid.util.Log; importandroid.view.MotionEvent; importandroid.view.View; importandroid.widget.ImageView; importjava.io.File; importjava.io.FileNotFoundException; importjava.io.FileOutputStream; publicclassMainActivityextendsAppCompatActivity{ privatefinalStringTAG=getClass().getSimpleName(); privateImageViewiv_show; privateBitmapcopyBm; privatefloatx; privatefloaty; privatePaintpaint; privateintpaintsize=1; privateFileOutputStreamfos; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化控件 iv_show=(ImageView)findViewById(R.id.iv_bg); //创建一个空白的bitmap Bitmapbitmap=BitmapFactory.decodeResource(getResources(),R.drawable.bg); copyBm=Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),bitmap.getConfig()); //创建画布 finalCanvascanvas=newCanvas(copyBm); //使用画布绘制图片 paint=newPaint(); canvas.drawBitmap(bitmap,newMatrix(),paint); iv_show.setImageBitmap(copyBm); //为画笔在屏幕上移动设置监听事件 iv_show.setOnTouchListener(newView.OnTouchListener(){ @Override publicbooleanonTouch(Viewv,MotionEventevent){ //获取当前事件的类型 intaction=event.getAction(); switch(action){ caseMotionEvent.ACTION_DOWN: //如果是手指按下时,记录一下手指的位置 x=event.getX(); y=event.getY(); Log.e(TAG,x+"******"+y); break; caseMotionEvent.ACTION_MOVE: //如果手指正在移动时 floatx1=event.getX(); floaty1=event.getY(); canvas.drawLine(x,y,x1,y1,paint); x=x1; y=y1; Log.e(TAG,x1+"**********"+y1); break; caseMotionEvent.ACTION_UP: break; } iv_show.setImageBitmap(copyBm); returntrue; } }); } //修改颜色 publicvoidcolor(Viewview){ paint.setColor(Color.RED); } //修改线条粗细 publicvoidsize(Viewview){ paintsize+=1; paint.setStrokeWidth(paintsize); } //保存图片 publicvoidsave(Viewview){ //设置图片保存的位置 Filefile=newFile(Environment.getExternalStorageDirectory(),SystemClock.currentThreadTimeMillis()+".png"); try{ fos=newFileOutputStream(file); }catch(FileNotFoundExceptione){ e.printStackTrace(); } //设置参数保存的质量 copyBm.compress(Bitmap.CompressFormat.PNG,100,fos); //定义一个意图,通过发出广播告诉系统扫描指定的位置的文件 Intentintent=newIntent(); intent.setAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); intent.setData(Uri.fromFile(file)); sendBroadcast(intent); } }

Android实现画画板案例

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