我的自定义摄像机无法启动。按下按钮时，代码始终会捕获异常。
我想要做的是录制低质量的视频，以便我可以将其转换为base64并将其发送到服务器。
我尝试使用android的原生摄像机使用意图并设置intent.putExtra("EXTRA_VIDEO_QUALITY", 0);，但质量没有变化。
所以我尝试制作自定义视频。
这是代码：
package holosoft.wasfty;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MyVideoActivity extends Activity implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private SurfaceView surfaceView;
public MediaRecorder mrec = new MediaRecorder();
private Button startRecording = null;
// private Button stopRecording = null;
File video;
private Camera mCamera;
private Boolean recording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_video);
Log.i(null, "Video starting");
startRecording = (Button) findViewById(R.id.buttonstart);
mCamera = Camera.open();
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
startRecording.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (!recording)
{
try {
startRecording();
startRecording.setText("stop");
recording = true;
} catch (Exception e) {
String message = e.getMessage();
Log.i(null, "Problem Start" + message);
mrec.release();
}
}
else
{
stopRecording();
startRecording.setText("Record");
}
}
});
}
protected void startRecording() throws IOException {
mrec = new MediaRecorder(); // Works well
mCamera.unlock();
mrec.setCamera(mCamera);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
mrec.setPreviewDisplay(surfaceHolder.getSurface());
File mediasro=new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES),"MyCameraAPP");
mrec.setOutputFile(mediasro.getPath()+File.separator+"VID_"+"HELLO"+".mp4");
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mrec.prepare();
mrec.start();
Intent returnIntent = new Intent();
returnIntent.putExtra("data",mediasro.getAbsolutePath());
setResult(RESULT_OK, returnIntent);
finish();
}
protected void stopRecording() {
/*mrec.stop();
mrec.release();
mCamera.release();*/
releaseMediaRecorder();
releaseCamera();
}
private void releaseMediaRecorder() {
if (mrec != null) {
mrec.reset(); // clear recorder configuration
mrec.release(); // release the recorder object
mrec = null;
mCamera.lock(); // lock camera for later use
}
}
private void releaseCamera() {
if (mCamera != null) {
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if ( mCamera == null )
{
mCamera = Camera.open();
}
if ( mCamera != null )
{
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (mCamera != null) {
Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
} else {
Toast.makeText(getApplicationContext(), "Camera not available!",
Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mCamera.release();
}
}
布局：
<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: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=".MyVideoActivity" >
<SurfaceView
android:id="@+id/surface_camera"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true" />
<Button
android:id="@+id/buttonstart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/CameraView"
android:layout_alignTop="@+id/CameraView"
android:text="Button" />
</RelativeLayout>
权限：
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
logcat的：
12-01 10:13:55.925: E/ActivityThread(9238): Caused by: java.lang.UnsatisfiedLinkError: Native method not found: dalvik.system.VMRuntime.pauseGc:(Ljava/lang/String;)I
12-01 10:13:55.925: E/ActivityThread(9238): at dalvik.system.VMRuntime.pauseGc(Native Method)
12-01 10:13:55.925: E/ActivityThread(9238): ... 15 more
12-01 10:13:55.955: I/(9238): Video starting
12-01 10:13:58.305: E/MediaRecorder(9238): setOutputFormat called in an invalid state: 4
12-01 10:13:58.305: I/(9238): Problem Startnull
12-01 10:13:59.020: I/(9238): Problem Startunlock failed
12-01 10:14:04.425: I/(9238): Problem Startunlock failed
12-01 10:14:07.000: I/(9238): Problem Startunlock failed
12-01 10:14:07.875: I/(9238): Problem Startunlock failed
12-01 10:14:08.460: I/(9238): Problem Startunlock failed
12-01 10:14:08.820: I/(9238): Problem Startunlock failed
12-01 10:14:09.095: I/(9238): Problem Startunlock failed
12-01 10:14:09.685: I/(9238): Problem Startunlock failed
12-01 10:14:10.385: I/(9238): Problem Startunlock failed
12-01 10:14:10.775: I/(9238): Problem Startunlock failed
12-01 10:14:11.095: I/(9238): Problem Startunlock failed
12-01 10:14:11.370: I/(9238): Problem Startunlock failed
12-01 10:14:11.660: I/(9238): Problem Startunlock failed
12-01 10:14:11.880: I/(9238): Problem Startunlock failed
12-01 10:14:12.165: I/(9238): Problem Startunlock failed
12-01 10:14:12.345: I/(9238): Problem Startunlock failed
12-01 10:14:12.605: I/(9238): Problem Startunlock failed
12-01 10:14:12.800: I/(9238): Problem Startunlock failed
12-01 10:14:13.510: D/AbsListView(9238): Get MotionRecognitionManager
我会感激任何帮助。提前致谢
答案 0 :(得分：0)
你已经写了两次
mrec.setPreviewDisplay(surfaceHolder.getSurface());