Process: com.example.mycamera2, PID: 24086
java.lang.RuntimeException: start failed.
at android.media.MediaRecorder.native_start(Native Method)
at android.media.MediaRecorder.start(MediaRecorder.java:1157)
at com.example.mycamera2.CameraUtils.startRecord(CameraUtils.java:161)
at com.example.mycamera2.MainActivity$1.onClick(MainActivity.java:88)
at android.view.View.performClick(View.java:5264)
at android.view.View$PerformClick.run(View.java:21297)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5621)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
code:
package com.example.mycamera2;
import android.content.Context;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaCodec;
import android.media.MediaRecorder;
import android.os.Environment;
import android.os.StatFs;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.File;
import java.io.IOException;
import java.util.List;
import static android.content.ContentValues.TAG;
/**
* Created by guoxw on 2017/10/31.
*/
public class CameraUtils {
private MediaRecorder mediaRecorder;
private Camera camera;
private boolean isCheck;
private SurfaceHolder.Callback callback;
private Context context;
private SurfaceView surfaceView;
private int height=240,width=300;
private MediaCodec mediaCodec;
public void create(SurfaceView surfaceView, Context context) {
this.context = context;
this.surfaceView = surfaceView;
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceView.setKeepScreenOn(true);
callback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
getVideoSize();
//setVideoFrameRate();
mediaRecorder = new MediaRecorder();
}
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
doChange(holder);
// setVideoFrameRate();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if(camera!=null){
camera.release();
camera=null;
}
}
};
surfaceView.getHolder().addCallback(callback);
}
private void doChange(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(holder);
camera.setDisplayOrientation(0);
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* startRecord 前调用一次，保证为前置摄像头
*/
public void changeCamera() {
int cameraCount = 0;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int i = 0; i < cameraCount; i++) {
Camera.getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
camera.stopPreview();
camera.release();
camera = null;
camera = Camera.open(i);
try {
camera.setPreviewDisplay(surfaceView.getHolder());
camera.setDisplayOrientation(0);
} catch (IOException e) {
e.printStackTrace();
}
camera.startPreview();
isCheck = true;
break;
}
}
}
public void stopRecord() {
mediaRecorder.release();
/****/
camera.stopPreview();
camera.release();
mediaRecorder = null;
camera = Camera.open();
mediaRecorder = new MediaRecorder();
doChange(surfaceView.getHolder());
}
public void destroy(){
if(mediaRecorder!=null&&camera!=null){
mediaRecorder.release();
camera.release();
mediaRecorder = null;
camera=null;
}
}
/**
*
* @param path 保存的路径
* @param name 录像视频名称(不包含后缀)
*/
public void startRecord(String path, String name) {
camera.unlock();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
//--mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
//--好像不起作用
//mediaRecorder.setVideoFrameRate(14);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mediaRecorder.setVideoEncodingBitRate(500*1024);
mediaRecorder.setVideoSize(width, height);
// setVideoFrameRate();
// mediaRecorder.setVideoFrameRate(14);
//--getVideoSize();
File file = new File(path);
if (!file.exists()) {
file.mkdirs();
}
mediaRecorder.setOutputFile(path + File.separator + name + ".mp4");
File file1=new File(path + File.separator + name + ".mp4");
if(file1.exists()){
file1.delete();
}
mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
/***不设置时，录制的视频总是倒着，翻屏导致视频上下翻滚*/
mediaRecorder.setOrientationHint(0);
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IOException e) {
e.printStackTrace();
Log.d(TAG, "startRecord: --"+e.getMessage());
}
}
/***
* 获取SupportedVideoSizes 控制输出视频width在300到600之间,选择最小的
*/
public void getVideoSize(){
Camera.Parameters parameters=camera.getParameters();
List<Camera.Size> videoSize=parameters.getSupportedVideoSizes();
if(videoSize!=null){
for(int i=0;i<videoSize.size();i++){
int width1=videoSize.get(i).width;
int height1=videoSize.get(i).height;
if(width1>=300&&width1<=500){
if(height1>=200&&height1<=500){
width=width1;
height=height1;
break;
}
}
Log.d(TAG, "getVideoSize:----w:-- "+videoSize.get(i).width+"---h:--"+videoSize.get(i).height);
}
}
}
/**
* 没用
*/
public void setVideoFrameRate(){
CamcorderProfile cProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_LOW);
mediaRecorder.setProfile(cProfile);
//设置录制的视频帧率,注意文档的说明:
mediaRecorder.setVideoFrameRate(20);
}
/**
* 获取手机内存可用大小 (返回kb值)
*/
public long getAvailableBlicks(){
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long Blocks = stat.getAvailableBlocks();
long size=blockSize*Blocks/1024;
return size;
}
}
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(x==0){
cameraUtils.changeCamera();
cameraUtils.startRecord(path,name);
image.setVisibility(View.INVISIBLE);
btn.setImageResource(R.drawable.camera_begain);
x=1;
} else if(x==1){
cameraUtils.stopRecord();
image.setVisibility(View.VISIBLE);
btn.setImageResource(R.drawable.camera_stop);
x=0;
}
}
});
结论：
方法： public void getVideoSize()获取手机支持的分辨率时，获得到的 List<Camera.Size> videoSize这个
结果集为null，导致seartRecord方法中的 mediaRecorder.setVideoSize(width, height)设置的宽高不支持。
至于getVideoSize返回为null的原因，待查。
public List<Size> getSupportedVideoSizes() {
String str = get(KEY_VIDEO_SIZE + SUPPORTED_VALUES_SUFFIX);
return splitSize(str);
}
private ArrayList<Size> splitSize(String str) {
if (str == null) return null;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
ArrayList<Size> sizeList = new ArrayList<Size>();
for (String s : splitter) {
Size size = strToSize(s);
if (size != null) sizeList.add(size);
}
if (sizeList.size() == 0) return null;
return sizeList;
}
