An example of scraping music for Android development

Scraping award in life often see, online now also has a variety of sweepstakes, below we are going to achieve a scraping music program, can perfect meet everyone's vanity, haha, the following start, 100% winning!

Let's take a look at the following:

Let's take a look at its layout:

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<RelativeLayout     android:layout_width="match_parent"     android:layout_height="match_parent">     <TextView          android:id="@+id/textView1"          android:layout_width="300dp"          android:layout_height="150dp"          android:layout_centerHorizontal="true"          android:layout_centerVertical="true"          android:background="@android:color/holo_red_dark"          android:gravity="center"          android:text="恭喜你，中奖啦！"          android:textSize="35dp" />    <net.androidchina.example.guale.EraseView          android:id="@+id/eraseView1"          android:layout_width="300dp"          android:layout_height="150dp"          android:layout_centerHorizontal="true"          android:layout_centerInParent="true"          android:layout_centerVertical="true"/> </RelativeLayout>

Layout is very simple, through the relative layout, the text and view overlap together, focusing on the implementation of the class Eraseview, the following look at the code of this class:

First we need to define a canvas and a brush

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paint = newPaint();paint.setStyle(Paint.Style.STROKE);paint.setXfermode(newPorterDuffXfermode(Mode.CLEAR));paint.setAntiAlias(true);paint.setDither(true);paint.setStrokeJoin(Paint.Join.ROUND);paint.setStrokeCap(Paint.Cap.ROUND);paint.setStrokeWidth(30);mCanvas = newCanvas(bitmap);

When your finger touches the screen, you need to trigger a slide event:

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@Overridepublic booleanonTouchEvent(MotionEvent event) {     floatax = event.getX();     floatay = event.getY();     if(event.getAction() == MotionEvent.ACTION_DOWN) {          isMove = false;          path.reset();          path.moveTo(ax, ay);          invalidate();          returntrue;     } elseif(event.getAction() == MotionEvent.ACTION_MOVE) {          isMove = true;          path.lineTo(ax, ay);          invalidate();          returntrue;     }     returnsuper.onTouchEvent(event);}

A path is required here to record the trajectory, and invalidate () needs to be called, and the OnDraw method is further called to redraw the canvas:

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@Overrideprotectedvoid onDraw(Canvas canvas) {     if(mCanvas == null) {           EraseBitmp();     }     canvas.drawBitmap(bitmap, 0, 0, null);     mCanvas.drawPath(path, paint);     super.onDraw(canvas);}

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An example of scraping music for Android development