很久没写了，随便写写~~
额，这是一个很简单的截屏工具，用的是Android系统的MediaProjectionManager实现截屏录制功能
使用到的主要类：
| 类 | 说明 |
|---|---|
| MediaProjectionManager | MediaProjection管理 |
| MediaProjection | 授予捕获屏幕或记录系统音频的功能 |
| VirtualDisplay | 个人理解类似虚拟屏幕？捕获屏幕后将数据输出到虚拟屏幕 然后可以获取视频的信息，指定输出的位置等 |
| ImageReader | 这个类被允许直接从Surface接收渲染的图像数据 |
| MediaRecorder | 用于将音视频编码输出 |
流程：
- 1.申请录屏screenCaptureIntent
- 2.调用activity的 startActivityForResult(screenCaptureIntent,code);需要用户允许
- 3.在onActivityResult获取屏幕录制的操作对象mMediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);
- 4.MediaProjection + VirtualDisplay + Surface（根据情况使用提供者） 实现录屏截屏功能
使用：
1.在Activity的onCreate下创建
screenshotRecordUtil = new ScreenshotRecordUtil();
screenshotRecordUtil.screenCaptureIntent(this, new ScreenshotRecordUtil.ScreenshotRecordCallback() {@Overridepublic void onScreenshotSuccess(String path, Bitmap bitmap) {//path目前没写（没有保存文件，有需求自行在ScreenshotRecordUtil里startCapture方法实现），//这里是直接获取的bitmap显示//在主线程更新UIrunOnUiThread(new Runnable() {@Overridepublic void run() {//Glide.with(Live2Activity.this).load(bitmap).into(image);}});}@Overridepublic void onScreenshotFailure() {//截图失败}@Overridepublic void onRecordStart() {//录屏开始//LogUtils.d("录屏开始:");}@Overridepublic void onRecordStop(String path) {//录屏结束//LogUtils.d("录屏结束:"+path);}});
2.实现onActivityResult方法
@RequiresApi(api = Build.VERSION_CODES.O)@Overrideprotected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == ScreenshotRecordUtil.REQUEST_SHOT_CODE && resultCode == RESULT_OK) {// 获取申请截屏结果screenshotRecordUtil.setUpImageProjection(Live2Activity.this, resultCode, data);} else if (requestCode == ScreenshotRecordUtil.REQUEST_RECORD_CODE && resultCode == RESULT_OK) {// 获取申请录屏结果//录屏文件存储目录地址String root = Environment.getExternalStorageDirectory() + AppConstants.PATH_VIDEO);File appDir = new File(root);if (!appDir.exists()) {appDir.mkdirs();}//创建文件File file = new File(appDir, System.currentTimeMillis() + ".mp4");screenshotRecordUtil.setUpVideoProjection(Live2Activity.this, resultCode, data, file);}}3.点击按钮，截屏
/*** 截取屏幕* REQUEST_SHOT_CODE 是请求码，和你的重复了可以自己更改*/@OnClick(R.id.btn_screenshot)void screenshot() {screenshotRecordUtil.screenCapture(ScreenshotRecordUtil.REQUEST_SHOT_CODE);}
4.点击按钮，录屏
/*** 录屏*/@OnClick(R.id.btn_recording)void onClickRecording() {if (screenshotRecordUtil.isRecording()) {screenshotRecordUtil.mediaRecorderStop();} else {screenshotRecordUtil.screenCapture(ScreenshotRecordUtil.REQUEST_RECORD_CODE);}}
ScreenshotRecordUtil 类：
import static android.content.Context.WINDOW_SERVICE;import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.hardware.display.DisplayManager;
import android.hardware.display.VirtualDisplay;
import android.media.Image;
import android.media.ImageReader;
import android.media.MediaRecorder;
import android.media.projection.MediaProjection;
import android.media.projection.MediaProjectionManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.WindowManager;import com.blankj.utilcode.util.StringUtils;
import com.blankj.utilcode.util.ThreadUtils;import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.TimeUnit;/*** 截屏录屏工具* <p>* 1.申请录屏Intent* <p>* 2.然后调用activity的 startActivityForResult(screenCaptureIntent,code);* <p>* 3.onActivityResult获取屏幕录制的操作对象* mMediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);* <p>* 4.MediaProjection + VirtualDisplay + Surface（根据情况使用提供者） 实现录屏截屏功能*/
public class ScreenshotRecordUtil {private static final String TAG = ScreenshotRecordUtil.class.getSimpleName();public static final int REQUEST_SHOT_CODE = 10011;//截屏请求回调codepublic static final int REQUEST_RECORD_CODE = 10012;//录屏请求回调codeprivate MediaRecorder mMediaRecorder; //MediaRecorder屏幕录制 需求场景是把屏幕录制成文件,录屏直播则使用MediaCodec或者大名鼎鼎的FFmpegprivate ImageReader mImageReader; //获取屏幕渲染得到Imageprivate MediaProjectionManager mediaProjectionManager; //系统提供的一个录屏服务private MediaProjection mMediaProjection; //屏幕录制的操作对象private VirtualDisplay mVirtualDisplay; //虚拟屏幕——VirtualDisplayprivate String mVideoPath; //录像输入地址private Activity activity;private Intent screenCaptureIntent;private ScreenshotRecordCallback screenshotRecordCallback;/*** 申请录屏Intent*/public void screenCaptureIntent(Activity activity, ScreenshotRecordCallback screenshotRecordCallback) {this.activity = activity;this.screenshotRecordCallback = screenshotRecordCallback;this.mediaProjectionManager = (MediaProjectionManager) activity.getSystemService(Context.MEDIA_PROJECTION_SERVICE);this.screenCaptureIntent = mediaProjectionManager.createScreenCaptureIntent();}/*** 调用activity的 startActivityForResult*/public void screenCapture(int code) {this.activity.startActivityForResult(screenCaptureIntent, code);}/*** 获取屏幕截图** @param activity activity* @param resultCode onActivityResult返回的 resultCode* @param resultData onActivityResult返回的 resultData*/public void setUpImageProjection(Activity activity, int resultCode, Intent resultData) {//创建mImageReader，用于获取VirtualDisplay的imageDisplayMetrics displayMetrics = new DisplayMetrics();WindowManager windowManager = (WindowManager) activity.getSystemService(WINDOW_SERVICE);windowManager.getDefaultDisplay().getMetrics(displayMetrics);int width = displayMetrics.widthPixels;int height = displayMetrics.heightPixels;Log.e(TAG, "displayMetrics width=" + width + ", height=" + height);this.mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 2);//获取屏幕录制的操作对象this.mMediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);//创建虚拟屏幕,使用ImageReader提供的Surface//VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR：当没有内容显示时，允许将内容镜像到专用显示器上。//VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY：仅显示此屏幕的内容，不镜像显示其他屏幕的内容。//VIRTUAL_DISPLAY_FLAG_PRESENTATION：创建演示文稿的屏幕。//VIRTUAL_DISPLAY_FLAG_PUBLIC：创建公开的屏幕。//VIRTUAL_DISPLAY_FLAG_SECURE：创建一个安全的屏幕this.mVirtualDisplay = mMediaProjection.createVirtualDisplay("ScreenCapture",width, height,displayMetrics.densityDpi,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mImageReader.getSurface(), null, null);//这里稍稍作了个延时，立马取的话 mImageReader.acquireLatestImage()可能为空ThreadUtils.executeByCachedWithDelay(new ThreadUtils.SimpleTask<Object>() {@Overridepublic Object doInBackground() throws Throwable {startCapture();return null;}@Overridepublic void onSuccess(Object result) {}}, 100, TimeUnit.MILLISECONDS);}/*** 屏幕录制** @param activity activity* @param resultCode onActivityResult返回的 resultCode* @param resultData onActivityResult返回的 resultData* @param file 录制输出文件*/public void setUpVideoProjection(Activity activity, int resultCode, Intent resultData, File file) {//创建mImageReader，用于获取VirtualDisplay的imageDisplayMetrics displayMetrics = new DisplayMetrics();WindowManager windowManager = (WindowManager) activity.getSystemService(WINDOW_SERVICE);windowManager.getDefaultDisplay().getMetrics(displayMetrics);int width = displayMetrics.widthPixels;int height = displayMetrics.heightPixels;Log.e(TAG, "displayMetrics width=" + width + ", height=" + height);initMediaRecorder(file, width, height);//获取屏幕录制的操作对象this.mMediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);//创建虚拟屏幕 需要在mMediaRecorder.prepare();后，否则mMediaRecorder.getSurface()拿不到Surface对象this.mVirtualDisplay = mMediaProjection.createVirtualDisplay("ScreenRecorder",width, height,displayMetrics.densityDpi,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mMediaRecorder.getSurface(), null, null);mediaRecorderStars();}/*** 截图*/public void startCapture() {String mImageName = System.currentTimeMillis() + ".png";Log.i(TAG, "image name is : " + mImageName);Image image = mImageReader.acquireLatestImage();if (image == null) {Log.e(TAG, "image is null.");if (screenshotRecordCallback != null) {screenshotRecordCallback.onScreenshotFailure();}return;}int width = image.getWidth();int height = image.getHeight();final Image.Plane[] planes = image.getPlanes();final ByteBuffer buffer = planes[0].getBuffer();int pixelStride = planes[0].getPixelStride();int rowStride = planes[0].getRowStride();int rowPadding = rowStride - pixelStride * width;Bitmap mBitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);mBitmap.copyPixelsFromBuffer(buffer);mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, width, height);image.close();if (mBitmap != null) {// 保存或者显示...if (screenshotRecordCallback != null) {screenshotRecordCallback.onScreenshotSuccess(null, mBitmap);}}}/*** 录屏*/private void initMediaRecorder(File file, int width, int height) {this.mMediaRecorder = new MediaRecorder();// 设置音频来源 需要动态申请 android.permission.RECORD_AUDIO 权限this.mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);// 设置视频来源this.mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);// 设置输出格式this.mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);// 设置输出文件this.mVideoPath = file.getAbsolutePath();this.mMediaRecorder.setOutputFile(mVideoPath);// 设置视频宽高this.mMediaRecorder.setVideoSize(width, height);// 设置视频帧率this.mMediaRecorder.setVideoFrameRate(30);// 设置视频编码比特率this.mMediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);// 设置音频编码this.mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);// 设置视频编码this.mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);try {this.mMediaRecorder.prepare();} catch (IOException e) {e.printStackTrace();}}//通过mVideoPath地址确定是否在录屏public boolean isRecording() {Log.e(TAG, "mVideoPath is " + mVideoPath + ",b:" + StringUtils.isEmpty(mVideoPath));return !StringUtils.isEmpty(mVideoPath);}//开始录制public void mediaRecorderStars() {if (StringUtils.isEmpty(mVideoPath)) {Log.e(TAG, "mVideoPath is null");return;}if (mMediaRecorder == null) {Log.e(TAG, "mMediaRecorder is null");return;}mMediaRecorder.start();if (screenshotRecordCallback != null) {screenshotRecordCallback.onRecordStart();}}//结束录制public void mediaRecorderStop() {if (mMediaRecorder != null) {mMediaRecorder.stop();if (screenshotRecordCallback != null) {screenshotRecordCallback.onRecordStop(mVideoPath);}mVideoPath = null;mMediaRecorder.reset();} else {Log.e(TAG, "mMediaRecorder is null");}}/*** 释放相关资源*/public void release() {if (mImageReader != null) {mImageReader.close();}if (mMediaRecorder != null) {mMediaRecorder.setOnErrorListener(null);mMediaProjection.stop();mMediaRecorder.reset();mMediaRecorder.release();}if (mVirtualDisplay != null) {mVirtualDisplay.release();mVirtualDisplay = null;}if (mMediaProjection != null) {mMediaProjection.stop();mMediaProjection = null;}}public interface ScreenshotRecordCallback {void onScreenshotSuccess(String path, Bitmap bitmap);void onScreenshotFailure();void onRecordStart();void onRecordStop(String path);}为了向别人、向世界证明自己而努力拼搏，而一旦你真的取得了成绩，才会明白：人无须向别人证明什么，只要你能超越自己。
