錄屏，google了一下，記錄下來，以免FQ

android 4.4 錄屏可通過adb:adb shell screenrecord /sdcard/video.mp4 （未測試）

android 5.0：開始提供了屏幕錄制api了（https://developer.android.com/about/versions/android-5.0#UI）

大概：

MediaProjectionManager是一個系統服務，通過他最終創建VirtualDisplay,創建時將MediaRecorder的Surface提供給VirtualDisplay

代碼來源：https://www.truiton.com/2015/05/capture-record-android-screen-using-mediaprojection-apis/ <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.RECORD_AUDIO"/>

　　

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#FFFFFF"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity"><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentTop="true"android:layout_centerHorizontal="true"android:layout_marginTop="10dp"android:text="Recording Status: "android:textAppearance="?android:attr/textAppearanceLarge"/><ToggleButtonandroid:id="@+id/toggle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@+id/textView"android:layout_centerHorizontal="true"android:layout_marginTop="5dp"android:text="Start"/><ImageViewandroid:id="@+id/imageView"android:layout_width="150dp"android:layout_height="150dp"android:layout_below="@+id/toggle"android:layout_centerHorizontal="true"android:layout_marginTop="85dp"android:src="@mipmap/truiton_short"/> </RelativeLayout>

　　

package com.truiton.screencapture;import android.Manifest; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.hardware.display.DisplayManager; import android.hardware.display.VirtualDisplay; import android.media.MediaRecorder; import android.media.projection.MediaProjection; import android.media.projection.MediaProjectionManager; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.Settings; import android.support.annotation.NonNull; import android.support.design.widget.Snackbar; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.util.DisplayMetrics; import android.util.Log; import android.util.SparseIntArray; import android.view.Surface; import android.view.View; import android.widget.Toast; import android.widget.ToggleButton;import java.io.IOException;public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity";private static final int REQUEST_CODE = 1000;private int mScreenDensity;private MediaProjectionManager mProjectionManager;private static final int DISPLAY_WIDTH = 720;private static final int DISPLAY_HEIGHT = 1280;private MediaProjection mMediaProjection;private VirtualDisplay mVirtualDisplay;private MediaProjectionCallback mMediaProjectionCallback;private ToggleButton mToggleButton;private MediaRecorder mMediaRecorder;private static final SparseIntArray ORIENTATIONS = new SparseIntArray();private static final int REQUEST_PERMISSIONS = 10;static {ORIENTATIONS.append(Surface.ROTATION_0, 90);ORIENTATIONS.append(Surface.ROTATION_90, 0);ORIENTATIONS.append(Surface.ROTATION_180, 270);ORIENTATIONS.append(Surface.ROTATION_270, 180);}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);DisplayMetrics metrics = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(metrics);mScreenDensity = metrics.densityDpi;mMediaRecorder = new MediaRecorder();mProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);mToggleButton = (ToggleButton) findViewById(R.id.toggle);mToggleButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE) + ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.RECORD_AUDIO)!= PackageManager.PERMISSION_GRANTED) {if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) ||ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.RECORD_AUDIO)) {mToggleButton.setChecked(false);Snackbar.make(findViewById(android.R.id.content), R.string.label_permissions,Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",new View.OnClickListener() {@Overridepublic void onClick(View v) {ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO},REQUEST_PERMISSIONS);}}).show();} else {ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO},REQUEST_PERMISSIONS);}} else {onToggleScreenShare(v);}}});}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode != REQUEST_CODE) {Log.e(TAG, "Unknown request code: " + requestCode);return;}if (resultCode != RESULT_OK) {Toast.makeText(this,"Screen Cast Permission Denied", Toast.LENGTH_SHORT).show();mToggleButton.setChecked(false);return;}mMediaProjectionCallback = new MediaProjectionCallback();mMediaProjection = mProjectionManager.getMediaProjection(resultCode, data);mMediaProjection.registerCallback(mMediaProjectionCallback, null);mVirtualDisplay = createVirtualDisplay();mMediaRecorder.start();}public void onToggleScreenShare(View view) {if (((ToggleButton) view).isChecked()) {initRecorder();shareScreen();} else {mMediaRecorder.stop();mMediaRecorder.reset();Log.v(TAG, "Stopping Recording");stopScreenSharing();}}private void shareScreen() {if (mMediaProjection == null) {startActivityForResult(mProjectionManager.createScreenCaptureIntent(), REQUEST_CODE);return;}mVirtualDisplay = createVirtualDisplay();mMediaRecorder.start();}private VirtualDisplay createVirtualDisplay() {return mMediaProjection.createVirtualDisplay("MainActivity",DISPLAY_WIDTH, DISPLAY_HEIGHT, mScreenDensity,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mMediaRecorder.getSurface(), null /*Callbacks*/, null/*Handler*/);}private void initRecorder() {try {mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);mMediaRecorder.setOutputFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/video.mp4");mMediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);mMediaRecorder.setVideoEncodingBitRate(512 * 1000);mMediaRecorder.setVideoFrameRate(30);int rotation = getWindowManager().getDefaultDisplay().getRotation();int orientation = ORIENTATIONS.get(rotation + 90);mMediaRecorder.setOrientationHint(orientation);mMediaRecorder.prepare();} catch (IOException e) {e.printStackTrace();}}private class MediaProjectionCallback extends MediaProjection.Callback {@Overridepublic void onStop() {if (mToggleButton.isChecked()) {mToggleButton.setChecked(false);mMediaRecorder.stop();mMediaRecorder.reset();Log.v(TAG, "Recording Stopped");}mMediaProjection = null;stopScreenSharing();}}private void stopScreenSharing() {if (mVirtualDisplay == null) {return;}mVirtualDisplay.release();//mMediaRecorder.release(); //If used: mMediaRecorder object cannot// be reused againdestroyMediaProjection();}@Overridepublic void onDestroy() {super.onDestroy();destroyMediaProjection();}private void destroyMediaProjection() {if (mMediaProjection != null) {mMediaProjection.unregisterCallback(mMediaProjectionCallback);mMediaProjection.stop();mMediaProjection = null;}Log.i(TAG, "MediaProjection Stopped");}@Overridepublic void onRequestPermissionsResult(int requestCode,@NonNull String permissions[],@NonNull int[] grantResults) {switch (requestCode) {case REQUEST_PERMISSIONS: {if ((grantResults.length > 0) && (grantResults[0] +grantResults[1]) == PackageManager.PERMISSION_GRANTED) {onToggleScreenShare(mToggleButton);} else {mToggleButton.setChecked(false);Snackbar.make(findViewById(android.R.id.content), R.string.label_permissions,Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);intent.addCategory(Intent.CATEGORY_DEFAULT);intent.setData(Uri.parse("package:" + getPackageName()));intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);startActivity(intent);}}).show();}return;}}} }

　　

轉載于:https://www.cnblogs.com/maoyuanwai/p/9494668.html

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