Android截屏方案实现原理解析

/**  * shot the current screen ,with the status but the status is trans *  *  * @param ctx current activity  */ public static Bitmap shotActivity(Activity ctx) {  View view = ctx.getWindow().getDecorView();  view.setDrawingCacheEnabled(true);  view.buildDrawingCache();  Bitmap bp = Bitmap.createBitmap(view.getDrawingCache(), 0, 0, view.getMeasuredWidth(),    view.getMeasuredHeight());  view.setDrawingCacheEnabled(false);  view.destroyDrawingCache();  return bp; }

public static Bitmap getViewBp(View v) {    if (null == v) {      return null;    }    v.setDrawingCacheEnabled(true);    v.buildDrawingCache();    if (Build.VERSION.SDK_INT >= 11) {      v.measure(MeasureSpec.makeMeasureSpec(v.getWidth(),          MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(          v.getHeight(), MeasureSpec.EXACTLY));      v.layout((int) v.getX(), (int) v.getY(),          (int) v.getX() + v.getMeasuredWidth(),          (int) v.getY() + v.getMeasuredHeight());    } else {      v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),          MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));      v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());    }    Bitmap b = Bitmap.createBitmap(v.getDrawingCache(), 0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());    v.setDrawingCacheEnabled(false);    v.destroyDrawingCache();    return b;  }

public static Bitmap shotScrollView(ScrollView scrollView) {  int h = 0;  Bitmap bitmap = null;  for (int i = 0; i < scrollView.getChildCount(); i++) {   h += scrollView.getChildAt(i).getHeight();   scrollView.getChildAt(i).setBackgroundColor(Color.parseColor("#ffffff"));  }  bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, Bitmap.Config.RGB_565);  final Canvas canvas = new Canvas(bitmap);  scrollView.draw(canvas);  return bitmap; }

public static Bitmap shotListView(ListView listview) {  ListAdapter adapter = listview.getAdapter();  int itemscount = adapter.getCount();  int allitemsheight = 0;  List<Bitmap> bmps = new ArrayList<Bitmap>();  for (int i = 0; i < itemscount; i++) {   View childView = adapter.getView(i, null, listview);   childView.measure(     View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),     View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));   childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());   childView.setDrawingCacheEnabled(true);   childView.buildDrawingCache();   bmps.add(childView.getDrawingCache());   allitemsheight += childView.getMeasuredHeight();  }  Bitmap bigbitmap =    Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight, Bitmap.Config.ARGB_8888);  Canvas bigcanvas = new Canvas(bigbitmap);  Paint paint = new Paint();  int iHeight = 0;  for (int i = 0; i < bmps.size(); i++) {   Bitmap bmp = bmps.get(i);   bigcanvas.drawBitmap(bmp, 0, iHeight, paint);   iHeight += bmp.getHeight();   bmp.recycle();   bmp = null;  }  return bigbitmap; }

public static Bitmap shotRecyclerView(RecyclerView view) {  RecyclerView.Adapter adapter = view.getAdapter();  Bitmap bigBitmap = null;  if (adapter != null) {   int size = adapter.getItemCount();   int height = 0;   Paint paint = new Paint();   int iHeight = 0;   final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);   // Use 1/8th of the available memory for this memory cache.   final int cacheSize = maxMemory / 8;   LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);   for (int i = 0; i < size; i++) {    RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));    adapter.onBindViewHolder(holder, i);    holder.itemView.measure(      View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),      View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));    holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),      holder.itemView.getMeasuredHeight());    holder.itemView.setDrawingCacheEnabled(true);    holder.itemView.buildDrawingCache();    Bitmap drawingCache = holder.itemView.getDrawingCache();    if (drawingCache != null) {     bitmaCache.put(String.valueOf(i), drawingCache);    }    height += holder.itemView.getMeasuredHeight();   }   bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);   Canvas bigCanvas = new Canvas(bigBitmap);   Drawable lBackground = view.getBackground();   if (lBackground instanceof ColorDrawable) {    ColorDrawable lColorDrawable = (ColorDrawable) lBackground;    int lColor = lColorDrawable.getColor();    bigCanvas.drawColor(lColor);   }   for (int i = 0; i < size; i++) {    Bitmap bitmap = bitmaCache.get(String.valueOf(i));    bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);    iHeight += bitmap.getHeight();    bitmap.recycle();   }  }  return bigBitmap; }

public static void screenShotRecycleView(final RecyclerView mRecyclerView, final  RecycleViewRecCallback callBack) {    if (mRecyclerView == null) {      return;    }    BaseListFragment.MyAdapter adapter = (BaseListFragment.MyAdapter) mRecyclerView.getAdapter();    final Paint paint = new Paint();    final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);    // Use 1/8th of the available memory for this memory cache.    final int cacheSize = maxMemory / 8;    LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);    final int oneScreenHeight = mRecyclerView.getMeasuredHeight();    int shotHeight = 0;    if (adapter != null && adapter.getData().size() > 0) {      int headerSize = adapter.getHeaderLayoutCount();      int dataSize = adapter.getData().size();      for (int i = 0; i < headerSize + dataSize; i++) {        BaseViewHolder holder = (BaseViewHolder) adapter.createViewHolder(mRecyclerView, adapter.getItemViewType(i));        if (i >= headerSize)          adapter.startConvert(holder, adapter.getData().get(i - headerSize));        holder.itemView.measure(            View.MeasureSpec.makeMeasureSpec(mRecyclerView.getWidth(), View.MeasureSpec.EXACTLY),            View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));        holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());        holder.itemView.setDrawingCacheEnabled(true);        holder.itemView.buildDrawingCache();        Bitmap drawingCache = holder.itemView.getDrawingCache();        //holder.itemView.destroyDrawingCache();//释放缓存占用的资源        if (drawingCache != null) {          bitmaCache.put(String.valueOf(i), drawingCache);        }        shotHeight += holder.itemView.getHeight();        if (shotHeight > 12000) {          //设置截图最大值          if (callBack != null)            callBack.onRecFinished(null);          return;        }      }      //添加底部高度(加载更多或loading布局高度,此处为固定值:)      final int footHight = Util.dip2px(mRecyclerView.getContext(), 42);      shotHeight += footHight;      //返回到顶部      while (mRecyclerView.canScrollVertically(-1)) {        mRecyclerView.scrollBy(0, -oneScreenHeight);      }      //绘制截图的背景      final Bitmap bigBitmap = Bitmap.createBitmap(mRecyclerView.getMeasuredWidth(), shotHeight, Bitmap.Config.ARGB_8888);      final Canvas bigCanvas = new Canvas(bigBitmap);      Drawable lBackground = mRecyclerView.getBackground();      if (lBackground instanceof ColorDrawable) {        ColorDrawable lColorDrawable = (ColorDrawable) lBackground;        int lColor = lColorDrawable.getColor();        bigCanvas.drawColor(lColor);      }      final int[] drawOffset = {0};      final Canvas canvas = new Canvas();      if (shotHeight <= oneScreenHeight) {        //仅有一页        Bitmap bitmap = Bitmap.createBitmap(mRecyclerView.getWidth(), mRecyclerView.getHeight(), Bitmap.Config.ARGB_8888);        canvas.setBitmap(bitmap);        mRecyclerView.draw(canvas);        if (callBack != null)          callBack.onRecFinished(bitmap);      } else {        //超过一页        final int finalShotHeight = shotHeight;        mRecyclerView.postDelayed(new Runnable() {          @Override          public void run() {            if ((drawOffset[0] + oneScreenHeight < finalShotHeight)) {              //超过一屏              Bitmap bitmap = Bitmap.createBitmap(mRecyclerView.getWidth(), mRecyclerView.getHeight(), Bitmap.Config.ARGB_8888);              canvas.setBitmap(bitmap);              mRecyclerView.draw(canvas);              bigCanvas.drawBitmap(bitmap, 0, drawOffset[0], paint);              drawOffset[0] += oneScreenHeight;              mRecyclerView.scrollBy(0, oneScreenHeight);              try {                bitmap.recycle();              } catch (Exception ex) {                ex.printStackTrace();              }              mRecyclerView.postDelayed(this, 10);            } else {              //不足一屏时的处理              int leftHeight = finalShotHeight - drawOffset[0] - footHight;              mRecyclerView.scrollBy(0, leftHeight);              int top = oneScreenHeight - (finalShotHeight - drawOffset[0]);              if (top > 0 && leftHeight > 0) {                Bitmap bitmap = Bitmap.createBitmap(mRecyclerView.getWidth(), mRecyclerView.getHeight(), Bitmap.Config.ARGB_8888);                canvas.setBitmap(bitmap);                mRecyclerView.draw(canvas);                //截图,只要补足的那块图                bitmap = Bitmap.createBitmap(bitmap, 0, top, bitmap.getWidth(), leftHeight, null, false);                bigCanvas.drawBitmap(bitmap, 0, drawOffset[0], paint);                try {                  bitmap.recycle();                } catch (Exception ex) {                  ex.printStackTrace();                }              }              if (callBack != null)                callBack.onRecFinished(bigBitmap);            }          }        }, 10);      }    }  }  public interface RecycleViewRecCallback {    void onRecFinished(Bitmap bitmap);  }

public void onBindViewHolder(ViewHolder holder, int positions) {    int viewType = holder.getItemViewType();    switch(viewType) {    case 0:      this.convert((BaseViewHolder)holder, this.mData.get(holder.getLayoutPosition() - this.getHeaderLayoutCount()));    case 273:    case 819:    case 1365:      break;    case 546:      this.addLoadMore(holder);      break;    default:      this.convert((BaseViewHolder)holder, this.mData.get(holder.getLayoutPosition() - this.getHeaderLayoutCount()));      this.onBindDefViewHolder((BaseViewHolder)holder, this.mData.get(holder.getLayoutPosition() - this.getHeaderLayoutCount()));    }  }

public class MyAdapter extends BaseQuickAdapter<T> {    public MyAdapter() {      super(getItemLayoutResId(), datas);    }    /**     * 用于对外暴露convert方法,构造缓存视图(截屏用)     * @param viewHolder     * @param t     */    public void startConvert(BaseViewHolder viewHolder, T t){      convert(viewHolder,t);    }    @Override    protected void convert(BaseViewHolder viewHolder, T t) {      bindView(viewHolder, t);    }  }

/**   * 截取recycler view   */  public static Bitmap getRecyclerViewScreenshot(RecyclerView view) {    BaseListFragment.MyAdapter adapter = (BaseListFragment.MyAdapter) view.getAdapter();    Bitmap bigBitmap = null;    if (adapter != null) {      int size = adapter.getData().size();      int height = 0;      Paint paint = new Paint();      int iHeight = 0;      final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);      // Use 1/8th of the available memory for this memory cache.      final int cacheSize = maxMemory / 8;      LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);      for (int i = 0; i < size; i++) {        BaseViewHolder holder = (BaseViewHolder) adapter.createViewHolder(view, adapter.getItemViewType(i));        //此处需要调用convert方法，否则绘制出来的都是空的item        adapter.startConvert(holder, adapter.getData().get(i));        holder.itemView.measure(            View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),            View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));        holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),            holder.itemView.getMeasuredHeight());        holder.itemView.setDrawingCacheEnabled(true);        holder.itemView.buildDrawingCache();        Bitmap drawingCache = holder.itemView.getDrawingCache();        if (drawingCache != null) {          bitmaCache.put(String.valueOf(i), drawingCache);        }        height += holder.itemView.getMeasuredHeight();      }      bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);      Canvas bigCanvas = new Canvas(bigBitmap);      Drawable lBackground = view.getBackground();      if (lBackground instanceof ColorDrawable) {        ColorDrawable lColorDrawable = (ColorDrawable) lBackground;        int lColor = lColorDrawable.getColor();        bigCanvas.drawColor(lColor);      }      for (int i = 0; i < size; i++) {        Bitmap bitmap = bitmaCache.get(String.valueOf(i));        bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);        iHeight += bitmap.getHeight();        bitmap.recycle();      }    }    return bigBitmap;  }

/**   * 将四张图拼成一张   *   * @param pic1 图一   * @param pic2 图二   * @param pic3 图三   * @param pic4 图四   * @return only_bitmap   * 详情见说明：{@link com.bertadata.qxb.util.ScreenShotUtils}   */  public static Bitmap combineBitmapsIntoOnlyOne(Bitmap pic1, Bitmap pic2, Bitmap pic3, Bitmap pic4, Activity context) {    int w_total = pic2.getWidth();    int h_total = pic1.getHeight() + pic2.getHeight() + pic3.getHeight() + pic4.getHeight();    int h_pic1 = pic1.getHeight();    int h_pic4 = pic4.getHeight();    int h_pic12 = pic1.getHeight() + pic2.getHeight();    //此处为防止OOM需要对高度做限制    if (h_total > HEIGHTLIMIT) {      return null;    }    Bitmap only_bitmap = Bitmap.createBitmap(w_total, h_total, Bitmap.Config.ARGB_4444);    Canvas canvas = new Canvas(only_bitmap);    canvas.drawColor(ContextCompat.getColor(context, R.color.color_content_bg));    canvas.drawBitmap(pic1, 0, 0, null);    canvas.drawBitmap(pic2, 0, h_pic1, null);    canvas.drawBitmap(pic3, 0, h_pic12, null);    canvas.drawBitmap(pic4, 0, h_total - h_pic4, null);    return only_bitmap;  }

/**   * 将传入的Bitmap合理压缩后输出到系统截屏目录下   * 命名格式为：Screenshot+时间戳+启信宝报名.jpg   * 同时通知系统重新扫描系统文件   *   * @param pic1  图一 标题栏截图   * @param pic2  图二 scrollview截图   * @param context 用于通知重新扫描文件系统，为提升性能可去掉   *        详情见说明：{@link com.bertadata.qxb.util.ScreenShotUtils}   */  public static void savingBitmapIntoFile(final Bitmap pic1, final Bitmap pic2, final Activity context, final BitmapAndFileCallBack callBack) {    if (context == null || context.isFinishing()) {      return;    }    Thread thread = new Thread(new Runnable() {      @Override      public void run() {        String fileReturnPath = "";        int w = pic1.getWidth();        Bitmap bottom = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_picture_combine_bottom);        Bitmap top_banner = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_picture_combine_top);        Bitmap bitmap_bottom = anyRatioCompressing(bottom, (float) w / bottom.getWidth(), (float) w / bottom.getWidth());        Bitmap bitmap_top = anyRatioCompressing(top_banner, (float) w / bottom.getWidth(), (float) w / bottom.getWidth());        final Bitmap only_bitmap = combineBitmapsIntoOnlyOne(bitmap_top, pic1, pic2, bitmap_bottom, context);        // 获取当前时间        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-ms", Locale.getDefault());        String data = sdf.format(new Date());        // 获取内存路径        // 设置图片路径+命名规范        // 声明输出文件        String storagePath = Environment.getExternalStorageDirectory().getAbsolutePath();        String fileTitle = "Screenshot_" + data + "_com.bertadata.qxb.biz_info.jpg";        String filePath = storagePath + "/DCIM/";        final String fileAbsolutePath = filePath + fileTitle;        File file = new File(fileAbsolutePath);        /**         * 质压与比压结合         * 分级压缩         * 输出文件         */        if (only_bitmap != null) {          try {            // 首先，对原图进行一步质量压缩,形成初步文件            FileOutputStream fos = new FileOutputStream(file);            only_bitmap.compress(Bitmap.CompressFormat.JPEG, 50, fos);            // 另建一个文件other_file预备输出            String other_fileTitle = "Screenshot_" + data + "_com.bertadata.qxb.jpg";            String other_fileAbsolutePath = filePath + other_fileTitle;            File other_file = new File(other_fileAbsolutePath);            FileOutputStream other_fos = new FileOutputStream(other_file);            // 其次，要判断质压之后的文件大小，按文件大小分级进行处理            long file_size = file.length() / 1024; // size of file(KB)            if (file_size < 0 || !(file.exists())) {              // 零级： 文件判空              throw new NullPointerException();            } else if (file_size > 0 && file_size <= 256) {              // 一级： 直接输出              deleteFile(other_file);              // 通知刷新文件系统，显示最新截取的图文件              fileReturnPath = fileAbsolutePath;              context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + fileAbsolutePath)));            } else if (file_size > 256 && file_size <= 768) {              // 二级： 简单压缩:压缩为原比例的3/4，质压为50%              anyRatioCompressing(only_bitmap, (float) 3 / 4, (float) 3 / 4).compress(Bitmap.CompressFormat.JPEG, 40, other_fos);              deleteFile(file);              // 通知刷新文件系统，显示最新截取的图文件              fileReturnPath = other_fileAbsolutePath;              context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + other_fileAbsolutePath)));            } else if (file_size > 768 && file_size <= 1280) {              // 三级： 中度压缩：压缩为原比例的1/2，质压为40%              anyRatioCompressing(only_bitmap, (float) 1 / 2, (float) 1 / 2).compress(Bitmap.CompressFormat.JPEG, 40, other_fos);              deleteFile(file);              // 通知刷新文件系统，显示最新截取的图文件              fileReturnPath = other_fileAbsolutePath;              context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + other_fileAbsolutePath)));            } else if (file_size > 1280 && file_size <= 2048) {              // 四级： 大幅压缩：压缩为原比例的1/3，质压为40%              anyRatioCompressing(only_bitmap, (float) 1 / 3, (float) 1 / 3).compress(Bitmap.CompressFormat.JPEG, 40, other_fos);              deleteFile(file);              // 通知刷新文件系统，显示最新截取的图文件              fileReturnPath = other_fileAbsolutePath;              context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + other_fileAbsolutePath)));            } else if (file_size > 2048) {              // 五级： 中度压缩：压缩为原比例的1/2，质压为40%              anyRatioCompressing(only_bitmap, (float) 1 / 2, (float) 1 / 2).compress(Bitmap.CompressFormat.JPEG, 40, other_fos);              deleteFile(file);              // 通知刷新文件系统，显示最新截取的图文件              fileReturnPath = other_fileAbsolutePath;              context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + other_fileAbsolutePath)));            }            // 注销fos;            fos.flush();            other_fos.flush();            other_fos.close();            fos.close();            //callback用于回传保存成功的路径以及Bitmap            callBack.onSuccess(only_bitmap, fileReturnPath);          } catch (Exception e) {            e.printStackTrace();          }        } else callBack.onSuccess(null, "");      }    });    thread.start();  }/**   * 可实现任意宽高比例压缩（宽高压比可不同）的压缩方法（主要用于微压）   *   * @param bitmap    源图   * @param width_ratio 宽压比（float）（0<&&<1)   * @param height_ratio 高压比（float）（0<&&<1)   * @return 目标图片   * <p>   */  public static Bitmap anyRatioCompressing(Bitmap bitmap, float width_ratio, float height_ratio) {    Matrix matrix = new Matrix();    matrix.postScale(width_ratio, height_ratio);    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, false);  }