目? ?錄

推薦網址

摳圖片上的某一角下來

8.2.2 Bitmap引起的OOM問題

8.3.1 三個繪圖工具類詳解

畫線條

8.3.16 Canvas API詳解(Part 1)

1.translate(平移)

2.rotate(旋轉)

3.scale(縮放)

4.skew(傾斜)

Android Matrix 詳解

---

推薦網址

【菜鳥教程】8.2.1 Bitmap(位圖)全解析 Part 1
https://www.runoob.com/w3cnote/android-tutorial-bitmap1.html


1.Android自定義控件
https://blog.csdn.net/yuanheng19930119/article/details/88055225

2.自定義控件其實很簡單
https://blog.csdn.net/aigestudio/article/details/41212583?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2

3.Android?Matrix?詳解
https://www.jianshu.com/p/5e30db034596

4.android?matrix?最全方法詳解與進階
https://blog.csdn.net/cquwentao/article/details/51445269

5.Android動畫
https://blog.csdn.net/zhangbijun1230/article/details/80262359

摳圖片上的某一角下來

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Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.mipmap.pic_meizi); Bitmap bitmap2 = Bitmap.createBitmap(bitmap1,100,100,200,200); img_bg = (ImageView) findViewById(R.id.img_bg); img_bg.setImageBitmap(bitmap2);

8.2.2 Bitmap引起的OOM問題

https://www.runoob.com/w3cnote/android-tutorial-bitmap2.html

8.3.1 三個繪圖工具類詳解

https://www.runoob.com/w3cnote/android-tutorial-drawable-tool.html

畫線條

【菜鳥教程】8.3.2 繪圖類實戰示例

https://www.runoob.com/w3cnote/android-tutorial-bitmap-demo.html

/*** Created by Jay on 2015/10/15 0015.*/ public class MyView extends View{private Paint mPaint; //繪制線條的Pathprivate Path mPath; //記錄用戶繪制的Pathprivate Canvas mCanvas; //內存中創建的Canvasprivate Bitmap mBitmap; //緩存繪制的內容private int mLastX;private int mLastY;public MyView(Context context) {super(context);init();}public MyView(Context context, AttributeSet attrs) {super(context, attrs);init();}public MyView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}private void init(){mPath = new Path();mPaint = new Paint(); //初始化畫筆mPaint.setColor(Color.GREEN);mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeJoin(Paint.Join.ROUND); //結合處為圓角mPaint.setStrokeCap(Paint.Cap.ROUND); // 設置轉彎處為圓角mPaint.setStrokeWidth(20); // 設置畫筆寬度}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int width = getMeasuredWidth();int height = getMeasuredHeight();// 初始化bitmap,CanvasmBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);mCanvas = new Canvas(mBitmap);}//重寫該方法，在這里繪圖@Overrideprotected void onDraw(Canvas canvas) {drawPath();canvas.drawBitmap(mBitmap, 0, 0, null);}//繪制線條private void drawPath(){mCanvas.drawPath(mPath, mPaint);}@Overridepublic boolean onTouchEvent(MotionEvent event) {int action = event.getAction();int x = (int) event.getX();int y = (int) event.getY();switch (action){case MotionEvent.ACTION_DOWN:mLastX = x;mLastY = y;mPath.moveTo(mLastX, mLastY);break;case MotionEvent.ACTION_MOVE:int dx = Math.abs(x - mLastX);int dy = Math.abs(y - mLastY);if (dx > 3 || dy > 3)mPath.lineTo(x, y);mLastX = x;mLastY = y;break;}invalidate();return true;} }

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8.3.16 Canvas API詳解(Part 1)

【菜鳥教程】https://www.runoob.com/w3cnote/android-tutorial-canvas-api1.html

1.translate(平移)

2.rotate(旋轉)

3.scale(縮放)

4.skew(傾斜)

Android Matrix 詳解

https://www.jianshu.com/p/5e30db034596

總結

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