目 錄
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
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; //繪製線條的Path
private Path mPath; //記錄用戶繪製的Path
private Canvas mCanvas; //內存中創建的Canvas
private Bitmap mBitmap; //緩存繪製的內容
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); //結合處爲圓角
mPaint.setStrokeCap(Paint.Cap.ROUND); // 設置轉彎處爲圓角
mPaint.setStrokeWidth(20); // 設置畫筆寬度
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
int height = getMeasuredHeight();
// 初始化bitmap,Canvas
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
//重寫該方法，在這裏繪圖
@Override
protected void onDraw(Canvas canvas) {
drawPath();
canvas.drawBitmap(mBitmap, 0, 0, null);
}
//繪製線條
private void drawPath(){
mCanvas.drawPath(mPath, mPaint);
}
@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:
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;
}
}
8.3.16 Canvas API詳解(Part 1)
【菜鳥教程】https://www.runoob.com/w3cnote/android-tutorial-canvas-api1.html
