android5.0以上实现录屏功能，并将录屏内容在相册中显示！（unity调用android方法）

最近再做一个项目，要求unity与原生android混合开发，要求点击unity按钮，android实现录屏功能并将录制内容保存到相册中，实现相册及时刷新，查阅了一下文档，android在5.0之后的api才开放了录屏接口。。。下面是实现：
package com.Xreal.TJYH;import android.Manifest;import android.content.ContentValues;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.os.Bundle;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.provider.MediaStore;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.util.DisplayMetrics;import android.view.KeyEvent;import android.widget.RelativeLayout;import android.widget.Toast;import java.io.File;import java.io.IOException;public class u3d extends UnityPlayerActivity {    private static final int RECORD_REQUEST_CODE  = 101;    private static final int STORAGE_REQUEST_CODE = 102;    private static final int AUDIO_REQUEST_CODE   = 103;    private static final int SHOW = 1;    private static final int CANCEL = 2;    private boolean isRecording;    public static Context currentActivity;    private RelativeLayout mU3d;    private MediaProjectionManager mediaProjectionManager;    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case SHOW:                    if (isRecording){                        Toast.makeText(u3d.this,"录制已开始",Toast.LENGTH_SHORT).show();                    }else {                        startScreenCapture();                        isRecording = true;                    }                    break;                case CANCEL:                    if (isRecording){                        mediaRecorder.stop();                        mediaRecorder.reset();                        mediaProjection.stop();                        virtualDisplay.release();                        isRecording = false;                        insertVideoToMediaStore(getSaveDirectory()+videoName);                        Toast.makeText(u3d.this,"录制结束",Toast.LENGTH_SHORT).show();                    }else {                        Toast.makeText(u3d.this,"没有开始录制",Toast.LENGTH_SHORT).show();                    }                    break;            }        }    };    private MediaProjection mediaProjection;    private MediaRecorder mediaRecorder;    private VirtualDisplay virtualDisplay;    /**     * 屏幕的宽度     */    private int screenWidth ;    /**     * 屏幕的高度     */    private int screenHeight ;    /**     * 屏幕的像素     */    private int screenDpi;    private DisplayMetrics metrics;    /**     * 保存在相册视频的名字     */    private String videoName;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_u3d);        mediaRecorder = new MediaRecorder();        metrics = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(metrics);        /**         * 动态注册权限         */        if (ContextCompat.checkSelfPermission(u3d.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this,                    new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, STORAGE_REQUEST_CODE);        }        if (ContextCompat.checkSelfPermission(u3d.this, Manifest.permission.RECORD_AUDIO)                != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this,                    new String[] {Manifest.permission.RECORD_AUDIO}, AUDIO_REQUEST_CODE);        }        currentActivity = this;        mU3d = (RelativeLayout) findViewById(R.id.u3d);        mU3d.addView(mUnityPlayer);        mUnityPlayer.requestFocus();    }    /**     * unity调用的方法，需要用一个handler进行处理实现功能，直接无法实现。     */    public void stopRecordin() {        mHandler.sendEmptyMessage(CANCEL);    }    /**     * unity调用的方法，需要用一个handler进行处理实现功能，直接无法实现。     */    public void startRecording() {        mHandler.sendEmptyMessage(SHOW);    }    private void startScreenCapture() {        mediaProjectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);        Intent captureIntent = mediaProjectionManager.createScreenCaptureIntent();        startActivityForResult(captureIntent, RECORD_REQUEST_CODE);    }    public void setConfig(int screenWidth, int screenHeight, int screenDpi) {        this.screenWidth = screenWidth;        this.screenHeight = screenHeight;        this.screenDpi = screenDpi;    }    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == RECORD_REQUEST_CODE && resultCode == RESULT_OK) {            mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);            setConfig(metrics.widthPixels,metrics.heightPixels,metrics.densityDpi);            startRecord();            Toast.makeText(this, "开始录制", Toast.LENGTH_SHORT).show();        }    }    public boolean startRecord() {        initRecorder();        createVirtualDisplay();        mediaRecorder.start();        return true;    }    private void createVirtualDisplay() {        virtualDisplay = mediaProjection.createVirtualDisplay("MainScreen", screenWidth, screenHeight, screenDpi,                DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mediaRecorder.getSurface(), null, null);    }    private void initRecorder() {        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);        videoName = System.currentTimeMillis() + ".mp4";        mediaRecorder.setOutputFile(getSaveDirectory() + videoName);        mediaRecorder.setVideoSize(screenWidth, screenHeight);        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);        mediaRecorder.setVideoFrameRate(30);        try {            mediaRecorder.prepare();        } catch (IOException e) {            e.printStackTrace();        }    }    public String getSaveDirectory() {        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            String screenRecordPath =  Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "DCIM"+File.separator+"Camera"+File.separator;            return screenRecordPath;        } else {            return null;        }    }    @Override    public boolean onKeyUp(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_BACK){            mUnityPlayer.quit();        }        return super.onKeyUp(keyCode, event);    }    public  void insertVideoToMediaStore( String filePath) {        ContentValues values = new ContentValues();        values.put(MediaStore.MediaColumns.DATA,filePath);        // video/*        values.put(MediaStore.MediaColumns.MIME_TYPE, "video/mp4");        getContentResolver().insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, values);    }    /**     * 打开相册，     *     * @return     */    public void openAlbum( ){        Intent intent = new Intent(Intent.ACTION_PICK);        startActivity(intent);    }}
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