关于Android开发录屏的资料，真的是很难找到那种拿来就能用的，不是付费专栏就是要积分才能下载源码，起不到任何帮助。我需要的是录制软件画面，找到的几个例子都是录制时返回桌面，然后弹出小窗口开始录制桌面，而且源码内容都太多了很难get到录屏重点。没办法最后只好去GitHub找找有没有简单点的源码，可算是找到一个简单易用的，随机改改就能实现需求，这里整理下分享给大家，希望看了可以少走弯路。
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final int PERMISSION_CODE = 1;
private int mScreenDensity;
private MediaProjectionManager mProjectionManager;
private static final int DISPLAY_WIDTH = 480;
private static final int DISPLAY_HEIGHT = 640;
private MediaProjection mMediaProjection;
private VirtualDisplay mVirtualDisplay;
private MediaProjectionCallback mMediaProjectionCallback;
private MediaRecorder mMediaRecorder;
private Button btnRecord,btnReady;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mScreenDensity = metrics.densityDpi;
initRecorder();
prepareRecorder();
mProjectionManager = (MediaProjectionManager) getSystemService
(Context.MEDIA_PROJECTION_SERVICE);
btnReady = findViewById(R.id.btnReady);
btnReady.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
shareScreen();//会打开新页面
btnReady.setText("录制准备就绪");
}
});
btnRecord = findViewById(R.id.btnRecord);
btnRecord.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(btnRecord.getText().equals("开始录制")) {
btnRecord.setText("停止录制");
if (mVirtualDisplay == null) {
mVirtualDisplay = createVirtualDisplay();
}
mMediaRecorder.start();
}
else{
btnRecord.setText("开始录制");
mMediaRecorder.stop();
mMediaRecorder.reset();
}
}
});
mMediaProjectionCallback = new MediaProjectionCallback();
}
@Override
public void onDestroy() {
super.onDestroy();
if (mMediaProjection != null) {
mMediaProjection.stop();
mMediaProjection = null;
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode != PERMISSION_CODE) {
Log.e(TAG, "Unknown request code: " + requestCode);
return;
}
if (resultCode != RESULT_OK) {
Toast.makeText(this,
"Screen Cast Permission Denied", Toast.LENGTH_SHORT).show();
return;
}
mMediaProjection = mProjectionManager.getMediaProjection(resultCode, data);
mMediaProjection.registerCallback(mMediaProjectionCallback, null);
mVirtualDisplay = createVirtualDisplay();
mMediaRecorder.start();
}
private void shareScreen() {
if (mMediaProjection == null) {
startActivityForResult(mProjectionManager.createScreenCaptureIntent(), PERMISSION_CODE);
return;
}
}
private void stopScreenSharing() {
if (mVirtualDisplay == null) {
return;
}
mVirtualDisplay.release();
//mMediaRecorder.release();
}
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 class MediaProjectionCallback extends MediaProjection.Callback {
@Override
public void onStop() {
if (btnRecord.getText().equals("停止录制")) {
mMediaRecorder.stop();
mMediaRecorder.reset();
Log.v(TAG, "Recording Stopped");
}
mMediaProjection = null;
stopScreenSharing();
Log.i(TAG, "MediaProjection Stopped");
}
}
private void prepareRecorder() {
try {
mMediaRecorder.prepare();
} catch (IllegalStateException | IOException e) {
e.printStackTrace();
finish();
}
}
public String getFilePath() {
final String directory = Environment.getExternalStorageDirectory() + File.separator + "Recordings";
if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
Toast.makeText(this, "Failed to get External Storage", Toast.LENGTH_SHORT).show();
return null;
}
final File folder = new File(directory);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
String filePath;
if (success) {
String videoName = ("capture_" + getCurSysDate() + ".mp4");
filePath = directory + File.separator + videoName;
} else {
Toast.makeText(this, "Failed to create Recordings directory", Toast.LENGTH_SHORT).show();
return null;
}
return filePath;
}
public String getCurSysDate() {
return new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date());
}
private void initRecorder() {
if (mMediaRecorder == null) {
mMediaRecorder = new MediaRecorder();
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mMediaRecorder.setVideoEncodingBitRate(10 * 1024 * 1024);
mMediaRecorder.setVideoFrameRate(60);
mMediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);
mMediaRecorder.setOutputFile(getFilePath());
}
}
}
只需要自己做两个按钮，就可以完成录制功能了。之所以需要两个按钮是因为准备录制时会重新打开页面，屏幕可能会顿一下或者闪一下，如果准备后直接录制，会把屏幕闪一下的画面也录下，所以这里放两个按钮，准备好了再录制，确保能录到自己想要的画面。