Android 截图主要为四种：View 截图、WebView 截图、屏幕截图、系统截图和 adb 截图。后两种截图不常用，不详细展开。

1. View截图

可以截取到View不可见的部分，生成长图，状态栏和导航栏无法截到

fun screenshotView(view: ViewGroup):Bitmap?{var h = 0var bitmap:Bitmap?=nullfor(i in 0 until view.childCount){h += view.getChildAt(i).heightview.getChildAt(i).setBackgroundColor(Color.parseColor("#6CC287"))}bitmap = Bitmap.createBitmap(view.width, h, Bitmap.Config.RGB_565)val canvas = Canvas(bitmap)view.draw(canvas)//重新赋色for(i in 0 until view.childCount){view.getChildAt(i).setBackgroundDrawable(null)}return bitmap
}

2. WebView截图

// 1.capturePicture方法废弃
// 2.getScale方法废弃// 3.getDrawingCache方法
private static byte[] screenshotWebView() {Bitmap bitmap = webView.getDrawingCache();byte[] drawByte = getBitmapByte(bmp);return drawByte;
}// 4.draw方法
private static byte[] screenshotWebView() {// webView.setDrawingCacheEnabled(true); 设置缓存Bitmap bitmap = Bitmap.createBitmap(webView.getWidth(), webView.getHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);webView.draw(canvas);webView.destroyDrawingCache();byte[] drawByte = getBitmapByte(bitmap);return drawByte;
}

可能会截取不到 cavans 元素，原因是开启了硬件加速（关闭硬件加速可能导致页面异常），可在 AndroidManifest.xml 中设置：

android:hardwareAccelerated="false"

截长图的话需要配置：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {WebView.enableSlowWholeDocumentDraw();
}
setContentView(R.layout.webview);

3. 屏幕截图

截取应用当前屏幕的图片：

	/*** 获取当前屏幕截图，包含状态栏** @param activity activity* @return Bitmap*/public static Bitmap captureWithStatusBar(Activity activity) {View view = activity.getWindow().getDecorView();view.setDrawingCacheEnabled(true);view.buildDrawingCache();Bitmap bmp = view.getDrawingCache();int width = getScreenWidth(activity);int height = getScreenHeight(activity);Bitmap ret = Bitmap.createBitmap(bmp, 0, 0, width, height);view.destroyDrawingCache();return ret;}/*** 获取当前屏幕截图，不包含状态栏** @param activity activity* @return Bitmap*/public static Bitmap captureWithoutStatusBar(Activity activity) {View view = activity.getWindow().getDecorView();view.setDrawingCacheEnabled(true);view.buildDrawingCache();Bitmap bmp = view.getDrawingCache();int statusBarHeight = getStatusBarHeight(activity);int width = getScreenWidth(activity);int height = getScreenHeight(activity);Bitmap ret = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);view.destroyDrawingCache();return ret;}/*** 得到屏幕的高** @param context* @return*/public static int getScreenHeight(Context context) {WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);int height = wm.getDefaultDisplay().getHeight();return height;}/*** 得到屏幕的宽** @param context* @return*/public static int getScreenWidth(Context context) {WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();return width;}/*** 获取状态栏高度** @param context 上下文* @return 状态栏高度*/public static int getStatusBarHeight(Context context) {int result = 0;int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");if (resourceId > 0) {result = context.getResources().getDimensionPixelSize(resourceId);}return result;}

格式转换方法

// Bitmap 转 Base64
private static String getBitmapString(Bitmap bitmap) {String result = null;ByteArrayOutputStream out = null;try {if (bitmap != null) {out = new ByteArrayOutputStream();bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
​out.flush();out.close();
​byte[] bitmapBytes = out.toByteArray();result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);}} catch (IOException e) {e.printStackTrace();} finally {try {if (out != null) {out.flush();out.close();}} catch (IOException e) {e.printStackTrace();}}return result;
}
​
// Bitmap 转 Byte
private static byte[] getBitmapByte(Bitmap bitmap){ByteArrayOutputStream out = new ByteArrayOutputStream();// 转换类型，压缩质量，字节流资源bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);try {out.flush();out.close();} catch (IOException e) {e.printStackTrace();}return out.toByteArray();
}// Drawable 转 Bitmap
public static Bitmap toBitmap(Drawable drawable) {if (drawable instanceof BitmapDrawable) {return ((BitmapDrawable) drawable).getBitmap();} else if (drawable instanceof ColorDrawable) {//colorBitmap bitmap = Bitmap.createBitmap(32, 32, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);canvas.drawColor(((ColorDrawable) drawable).getColor());return bitmap;} else if (drawable instanceof NinePatchDrawable) {//.9.pngBitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());drawable.draw(canvas);return bitmap;}return null;
}