Android 后台生成长图并分享示例(非长截图)

public LiveDrawLongPictureUtil(Context context) { super(context); init(context);}

public LiveDrawLongPictureUtil(Context context, AttributeSet attrs) { super(context, attrs); init(context);}

public LiveDrawLongPictureUtil(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context);}

private void init(Context context) {

this.context = context;

// 初始化各个控件

rootView = LayoutInflater.from(context) .inflate(R.layout.layout_draw_long_picture, this, false);

llTopView = rootView.findViewById(R.id.llTopView);// 头部view，高度固定，可直接获取到对应的bitmap

llContent = rootView.findViewById(R.id.llContent);// 各种固定高度的view，高度固定，可直接获取到对应的bitmap

llBottomView = rootView.findViewById(R.id.llBottomView);// 底部view，高度固定，可直接获取到对应的bitmap

// 测量各个块儿的view的宽高（这步很重要，后面需要用到宽高数据，进行画布的创建）

  layoutView(llTopView);
  layoutView(llContent);
  layoutView(llBottomView);

  widthTop = llTopView.getMeasuredWidth();
  heightTop = llTopView.getMeasuredHeight();

  widthBottom = llBottomView.getMeasuredWidth();
  heightBottom = llBottomView.getMeasuredHeight();
}

// 测量view宽高的方法（仅测量父布局）
 private void measureView(View v) {
  int width = HomepageUtil.getPhoneWid();
  int height = HomepageUtil.getPhoneHei();

v.layout(0, 0, width, height);
  int measuredWidth = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
  int measuredHeight = View.MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
  v.measure(measuredWidth, measuredHeight);
  v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
 }

Bitmap bitmapAll = Bitmap.createBitmap(allBitmapWidth, allBitmapHeight, Bitmap.Config.RGB_565);// 创建所需大小的bitmap

Canvas canvas = new Canvas(bitmapAll);// 创建空白画布
canvas.drawColor(Color.WHITE);// 背景颜色
Paint paint = new Paint();// 画笔
paint.setAntiAlias(true);// 设置抗锯齿
paint.setDither(true);// 防抖动
paint.setFilterBitmap(true);// 设置允许过滤