我正在使用Android开发(SDK 2.2),我想用
在一个项目中,我使用
我尝试创建一个相机,并使用
是否可能同时执行这两个操作?
实际上,我不知道如何将两件事联系起来?
我的代码:
mediaRecorder
录制视频,同时对每个预览帧进行处理。在一个项目中,我使用
MediaRecorder
记录视频,在另一个项目中,我使用PreviewCallback
中的onPreviewFrame(byte[] data, Camera camera)
处理预览图片。我尝试创建一个相机,并使用
setCamera
函数将其与mediaRecorder
一起使用,但它不起作用。是否可能同时执行这两个操作?
实际上,我不知道如何将两件事联系起来?
我的代码:
package ch.fraise;
import java.io.IOException;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class CameraActivity extends Activity implements SurfaceHolder.Callback,
Camera.AutoFocusCallback {
private SurfaceView preview;
private SurfaceHolder previewHolder;
private MediaRecorder mRecorder;
private Camera mCamera;
private boolean mPreviewRunning = false;
private boolean mCaptureFrame = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e("", "Begin onCreate");
setContentView(R.layout.main);
preview = (SurfaceView) findViewById(R.id.surfaceView1);
previewHolder = preview.getHolder();
previewHolder.addCallback(this);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mRecorder = new MediaRecorder();
}
@Override
public void onResume() {
super.onResume();
}
@Override
public void onPause() {
super.onPause();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.capture_menu, menu);
return true;
}
public void startRecording() {
Log.e("", "Begin StartRecording");
mCaptureFrame = true;
mRecorder.start();
}
public void stopRecording() {
Log.e("", "Begin StopChange");
mRecorder.stop();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.startRecording:
startRecording();
return true;
case R.id.stopRecording:
stopRecording();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.e("", "Begin surfaceDestroy");
mCamera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
mRecorder.reset();
mRecorder.release();
}
@Override
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
}
/*
* PreviewCallback()
*
* this callback captures the preview at every frame and puts it in a byte
* buffer. we will evaluate if this is a frame that we want to process, and
* if so, we will send it to an asynchronous thread that will process it to
* an ARGB Bitmap and POST it to the server
*/
PreviewCallback previewCallback = new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
Log.e("", "onPreviewFrame pass");
if (mCaptureFrame) {
mCaptureFrame = false;
// new FrameHandler().execute(data);
}
}
};
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.e("", "Begin SurfaceChange");
mRecorder.reset();
mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mRecorder.setOutputFile("/sdcard/videotest2.mp4");
mRecorder.setVideoFrameRate(30);
mRecorder.setPreviewDisplay(previewHolder.getSurface());
try {
mRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (mPreviewRunning)
mCamera.stopPreview();
Camera.Parameters p = mCamera.getParameters();
// p.setPreviewSize(width, height);
mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.setPreviewCallback(previewCallback);
mCamera.startPreview();
mPreviewRunning = true;
}
}
同时,XML 文件中的权限:
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.RECORD_VIDEO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>