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本文實例為大家分享了Android studio實現刮刮樂的具體代碼，供大家參考，具體內容如下
MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
第一種方法：
GuaTwo
public class GuaTwo extends View {
/*第一種方法*/
private Path mPath;//手刮動的path，過程
private Paint mOutterPaint;//繪制mPath的畫筆
private Canvas mCanvas;//臨時畫布
private Bitmap mBitmap;//臨時圖片
//記錄用戶path每次的開始坐標值
private int mLastX;
private int mLastY;
private Bitmap mOutterBitmap;//圖片遮罩，就是手刮動，要擦掉的那張圖
public GuaTwo(Context context) {
this(context, null);
}
public GuaTwo(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public GuaTwo(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//獲得控件的寬高
int width = getMeasuredWidth();
int height = getMeasuredHeight();
//初始化bitmap
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
//設置畫筆屬性
setupOutPaint();
mCanvas.drawColor(Color.parseColor("#c0c0c0"));
}
@Override
protected void onDraw(Canvas canvas) {
mOutterPaint.setStyle(Paint.Style.STROKE);
mOutterPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));//Mode.DST_OUT改模式就類似橡皮檫，這個屬性設置是關鍵
canvas.drawBitmap(mOutterBitmap, 0, 0, null);
canvas.drawBitmap(mBitmap, 0, 0, null);
mCanvas.drawPath(mPath, mOutterPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
int x = (int) event.getX();
int y = (int) event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN://按下
//記錄按下的時候的X和Y值，以便于之后移動的時候繪制
mLastX = x;
mLastY = y;
mPath.moveTo(mLastX, mLastY);
break;
case MotionEvent.ACTION_MOVE://移動
//拿到用戶移動的X絕對值，Y軸絕對值
int dx = Math.abs(x - mLastX);
int dy = Math.abs(y - mLastY);
//用戶滑動超過3像素才會改變，這個可以不做，做只是為了避免很頻繁的響應而已。
if (dx > 3 || dy > 3) {
mPath.lineTo(x, y);
}
mLastX = x;
mLastY = y;
break;
}
invalidate();//刷新UI
return true;
}
/**
* 繪制path（也就是手刮動的path來繪制） 的畫筆屬性
* 類似橡皮擦
*/
private void setupOutPaint() {
mOutterPaint.setColor(Color.RED);
mOutterPaint.setAntiAlias(true);
mOutterPaint.setDither(true);
mOutterPaint.setStrokeJoin(Paint.Join.ROUND);//設置圓角
mOutterPaint.setStrokeCap(Paint.Cap.ROUND);
mOutterPaint.setStyle(Paint.Style.FILL);
mOutterPaint.setStrokeWidth(60);//設置畫筆寬度
}
/**
* 初始化信息
*/
private void init() {
mOutterPaint = new Paint();
mPath = new Path();
mOutterBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.mein);
}
第二種方法：
GuaTwo
private Path mPath;//手刮動的path，過程
private Paint mOutterPaint;//繪制mPath的畫筆
private Canvas mCanvas;
private Bitmap mBitmap;
//記錄用戶path每次的開始坐標值
private int mLastX;
private int mLastY;
private Bitmap mOutterBitmap;//圖片遮罩，就是手刮動，要擦掉的那張圖
private String mText;//刮獎文本信息
private Rect mTextBound;
private Paint mBackPaint;//刮獎信息的畫筆
public GuaTwo(Context context) {
this(context, null);
}
public GuaTwo(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public GuaTwo(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//獲得控件的寬高
int width = getMeasuredWidth();
int height = getMeasuredHeight();
//初始化bitmap
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);//用指定的位圖構造一個畫布來繪制。
//設置畫筆屬性
setupOutPaint();
setUpBackPaint();
// mCanvas.drawColor(Color.parseColor("#c0c0c0"));
mCanvas.drawRoundRect(new RectF(0, 0, width, height), 30, 30,
mOutterPaint);//用mOutterPaint畫圓角矩形
mCanvas.drawBitmap(mOutterBitmap, null, new Rect(0, 0, width, height),
null);//在剛剛畫的圓角矩形上面再畫一個bitmap圖片，讓圖片大小和圓角矩形大小相關聯
}
@Override
protected void onDraw(Canvas canvas) {
mOutterPaint.setStyle(Paint.Style.STROKE);
mOutterPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));//Mode.DST_OUT改模式就類似橡皮檫，這個屬性設置是關鍵
canvas.drawText(mText, (getWidth() - mTextBound.width()) / 2, getHeight() / 2 - mTextBound.height() / 2, mBackPaint);//把獲獎信息放在正中間
mCanvas.drawPath(mPath, mOutterPaint);
canvas.drawBitmap(mBitmap, 0, 0, null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
int x = (int) event.getX();
int y = (int) event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN://按下
//記錄按下的時候的X和Y值，以便于之后移動的時候繪制
mLastX = x;
mLastY = y;
mPath.moveTo(mLastX, mLastY);
break;
case MotionEvent.ACTION_MOVE://移動
//拿到用戶移動的X絕對值，Y軸絕對值
int dx = Math.abs(x - mLastX);
int dy = Math.abs(y - mLastY);
//用戶滑動超過3像素才會改變，這個可以不做，做只是為了避免很頻繁的相應而已。
if (dx > 3 || dy > 3) {
mPath.lineTo(x, y);
}
mLastX = x;
mLastY = y;
break;
}
invalidate();//刷新UI
return true;
}
private void setUpBackPaint() {
mBackPaint.setColor(Color.RED);
mBackPaint.setStyle(Paint.Style.FILL);
mBackPaint.setTextSize(60);
//獲得當前畫筆繪制文本的寬和高
mBackPaint.getTextBounds(mText, 0, mText.length(), mTextBound);
}
*//**
* 繪制path（也就是手刮動的path來繪制） 的畫筆屬性
* 類似橡皮擦
*//*
private void setupOutPaint() {
mOutterPaint.setColor(Color.RED);
mOutterPaint.setAntiAlias(true);
mOutterPaint.setDither(true);
mOutterPaint.setStrokeJoin(Paint.Join.ROUND);//設置圓角
mOutterPaint.setStrokeCap(Paint.Cap.ROUND);
mOutterPaint.setStyle(Paint.Style.FILL);
mOutterPaint.setStrokeWidth(60);//設置畫筆寬度
}
*//**
* 初始化信息
*//*
private void init() {
mOutterPaint = new Paint();
mPath = new Path();
mOutterBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.huahua);
mText = "您中獎了！";
mTextBound = new Rect();
mBackPaint = new Paint();
}
布局文件
xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.bwie.test.guaguale.MainActivity">
<com.bwie.test.guaguale.GuaTwo
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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