修复在录制过程中，点击home键返回出现黑屏

xvideo-demo/build.gradle

@@ -74,9 +74,9 @@ dependencies {
     //butterknife的sdk
     implementation 'com.jakewharton:butterknife:8.8.1'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
-//    implementation project(':xvideo-lib')
+    implementation project(':xvideo-lib')
 
-    implementation 'com.github.xuexiangjys:XVideo:1.0.1'
+//    implementation 'com.github.xuexiangjys:XVideo:1.0.1'
     implementation 'com.github.xuexiangjys:NiceVieoPlayer:3.0.1'
     implementation deps.glide
 }

xvideo-lib/src/main/java/com/xuexiang/xvideo/MediaRecorderBase.java

@@ -260,12 +260,19 @@ public abstract class MediaRecorderBase implements Callback, PreviewCallback, IM
             case Camera.CameraInfo.CAMERA_FACING_FRONT:
             case Camera.CameraInfo.CAMERA_FACING_BACK:
                 mCameraId = cameraFacingFront;
-                stopPreview();
-                startPreview();
+                resetPreview();
                 break;
         }
     }
 
+    /**
+     * 重置预览显示
+     */
+    private void resetPreview() {
+        stopPreview();
+        startPreview();
+    }
+
     /**
      * 切换前置/后置摄像头
      */
@@ -415,8 +422,9 @@ public abstract class MediaRecorderBase implements Callback, PreviewCallback, IM
      */
     public void prepare() {
         mPrepared = true;
-        if (mSurfaceCreated)
+        if (mSurfaceCreated) {
             startPreview();
+        }
     }
 
     /**
@@ -712,17 +720,25 @@ public abstract class MediaRecorderBase implements Callback, PreviewCallback, IM
     public void surfaceCreated(SurfaceHolder holder) {
         this.mSurfaceHolder = holder;
         this.mSurfaceCreated = true;
-        if (mPrepared && !mStartPreview)
-            startPreview();
+        if (mPrepared) {
+            if (!mStartPreview) {
+                startPreview();
+            } else {
+                resetPreview();
+            }
+        }
     }
 
     @Override
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
-        this.mSurfaceHolder = holder;
+        mSurfaceHolder = holder;
     }
 
     @Override
     public void surfaceDestroyed(SurfaceHolder holder) {
+        if (mRecording) {
+            setStopDate();
+        }
         mSurfaceHolder = null;
         mSurfaceCreated = false;
     }
@@ -738,26 +754,6 @@ public abstract class MediaRecorderBase implements Callback, PreviewCallback, IM
         camera.addCallbackBuffer(data);
     }
 
-    /**
-     * 测试PreviewFrame回调次数，时间1分钟
-     */
-    public void testPreviewFrameCallCount() {
-        new CountDownTimer(1 * 60 * 1000, 1000) {
-
-            @Override
-            public void onTick(long millisUntilFinished) {
-                Log.e("[Vitamio Recorder]", "testFrameRate..." + mPreviewFrameCallCount);
-                mPreviewFrameCallCount = 0;
-            }
-
-            @Override
-            public void onFinish() {
-
-            }
-
-        }.start();
-    }
-
     /**
      * 接收音频数据
      */

xvideo-lib/src/main/java/com/xuexiang/xvideo/MediaRecorderFragment.java

@@ -349,10 +349,13 @@ public class MediaRecorderFragment extends Fragment implements
         super.onResume();
         if (mMediaRecorder == null) {
             initMediaRecorder();
-        } else {
+        } else { //回到页面
             mRecordLed.setChecked(false);
             mMediaRecorder.prepare();
             mProgressView.setData(mMediaObject);
+            if (mMediaRecorder instanceof MediaRecorderNative) {
+                ((MediaRecorderNative) mMediaRecorder).activityResume();
+            }
         }
     }
 
@@ -378,7 +381,6 @@ public class MediaRecorderFragment extends Fragment implements
 //		TODO 开始录制的图标
         mRecordController.animate().scaleX(0.8f).scaleY(0.8f).setDuration(500).start();
 
-
         if (mHandler != null) {
             mHandler.removeMessages(HANDLE_INVALIDATE_PROGRESS);
             mHandler.sendEmptyMessage(HANDLE_INVALIDATE_PROGRESS);

xvideo-lib/src/main/java/com/xuexiang/xvideo/MediaRecorderNative.java

@@ -140,4 +140,8 @@ public class MediaRecorderNative extends MediaRecorderBase implements MediaRecor
     public void activityStop() {
         FFmpegBridge.unRegisterFFmpegStateListener(this);
     }
+
+    public void activityResume() {
+        FFmpegBridge.registerFFmpegStateListener(this);
+    }
 }