我的自定义录制应用程序使用android时遇到了一些错误。我从一本名为PRO Android Media的书中看到了大部分代码。我使用sdk“8”版本开发了应用程序。但是，我正在测试我的htc evo 4g上的手机，它刚刚更新为姜饼。所以我不知道会有多大改变。无论如何，当我在2.2版本上测试时，我的应用程序仍然无法正常工作。
以下是代码
package com.apapa.vrsixty;
import java.io.File;
import java.io.IOException;
import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;
public class record extends Activity implements OnClickListener, SurfaceHolder.Callback{
MediaRecorder recorder;
SurfaceHolder holder;
boolean recording=false;
public static final String TAG = "VIDEOCAPTURE";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
recorder = new MediaRecorder();// Instantiate our media recording object
initRecorder();
setContentView(R.layout.view);
SurfaceView cameraView = (SurfaceView) findViewById(R.id.surface_view);
holder = cameraView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
cameraView.setClickable(true);// make the surface view clickable
cameraView.setOnClickListener((OnClickListener) this);// onClicklistener to be called when the surface view is clicked
}
private void initRecorder() {// this takes care of all the mediarecorder settings
File OutputFile = new File(Environment.getExternalStorageDirectory().getPath());
String video= "/DCIM/100MEDIA/Video";
CamcorderProfile cpHigh = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
recorder.setProfile(cpHigh);
//recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
// default microphone to be used for audio
// recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);// default camera to be used for video capture.
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// generally used also includes h264 and best for flash
// recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //well known video codec used by many including for flash
//recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);// typically amr_nb is the only codec for mobile phones so...
//recorder.setVideoFrameRate(15);// typically 12-15 best for normal use. For 1080p usually 30fms is used.
// recorder.setVideoSize(720,480);// best size for resolution.
//recorder.setMaxFileSize(10000000);
recorder.setOutputFile(OutputFile.getAbsolutePath()+video+".3gp");
//recorder.setVideoEncodingBitRate(256000);//
//recorder.setAudioEncodingBitRate(8000);
recorder.setMaxDuration(600000);
}
/*if(record.setMaxDuration>60000){
recorder.stop();
MediaRecorder.OnInfoListener;
Toast display = Toast.makeText(this, "You have exceeded the record time", Toast.LENGTH_SHORT);// toast shows a display of little sorts
display.show();
return true;
}*/
private void prepareRecorder() {
recorder.setPreviewDisplay(holder.getSurface());
try {
recorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
finish();
} catch (IOException e) {
e.printStackTrace();
finish();
}
}
public void onClick(View v) {
if (recording) {
recorder.stop();
recording = false;
// Let's initRecorder so we can record again
initRecorder();
prepareRecorder();
Toast display = Toast.makeText(this, "Stopped Recording", Toast.LENGTH_SHORT);// toast shows a display of little sorts
display.show();
} else {
recorder.start();
Log.v(TAG,"Recording Started");
recording = true;
}
}
public void surfaceCreated(SurfaceHolder holder) {
initRecorder();
Log.v(TAG,"surfaceCreated");
prepareRecorder();
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
if (recording) {
recorder.stop();
recording = false;
}
recorder.release();
finish();
}
它带来了这些错误。
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.apapa.vrsixty/com.apapa.vrsixty.record}: java.lang.IllegalStateException
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1821)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread.access$1500(ActivityThread.java:132)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.os.Handler.dispatchMessage(Handler.java:99)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.os.Looper.loop(Looper.java:143)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread.main(ActivityThread.java:4263)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at java.lang.reflect.Method.invokeNative(Native Method)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at java.lang.reflect.Method.invoke(Method.java:507)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at dalvik.system.NativeStart.main(Native Method)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): Caused by: java.lang.IllegalStateException
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.media.MediaRecorder.setOutputFormat(Native Method)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.media.MediaRecorder.setProfile(MediaRecorder.java:293)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at com.apapa.vrsixty.record.initRecorder(record.java:67)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at com.apapa.vrsixty.record.onCreate(record.java:50)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
06-09 13:37:52.833: ERROR/AndroidRuntime(27979): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
请提供任何帮助。我只是不能等到实际录音而不是“应用程序意外停止了。”
非常感谢，recorder.reset();为我工作但我在启动录音机时遇到了问题。在实际显示预览之前，我必须先点击我的手机。另外，当视频开始录制时，如何让录音机在倒计时中显示数字？即使我包含
recorder.OutPutFile("/sdcard/video.mp4");
我的清单文件中有WRITE_EXTERNAL_STORAGE权限。
另一个问题是如何以增量方式保存视频。例如，我录制的第一个视频保存为“video1”，第二个视频保存为“video2”，依此类推。我将非常感谢您对此问题的任何帮助，谢谢。
答案 0 :(得分：2)
您还需要确保可以写入SD卡：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
最后，您必须设置音频和视频源。尝试将initRecorder方法替换为书中的方法，看看你是否进一步：
private void initRecorder() {
recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
CamcorderProfile cpHigh = CamcorderProfile
.get(CamcorderProfile.QUALITY_HIGH);
recorder.setProfile(cpHigh);
recorder.setOutputFile("/sdcard/videocapture_example.mp4");
recorder.setMaxDuration(50000); // 50 seconds
recorder.setMaxFileSize(5000000); // Approximately 5 megabytes
}
答案 1 :(得分：2)
你不知道函数setProfile（）。 函数setProfile（）执行以下所有操作：
在setOutputFormat之后setProfile。
public void setProfile(CamcorderProfile profile) {
setOutputFormat(profile.fileFormat);
setVideoFrameRate(profile.videoFrameRate);
setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);
setVideoEncodingBitRate(profile.videoBitRate);
setAudioEncodingBitRate(profile.audioBitRate);
setAudioChannels(profile.audioChannels);
setAudioSamplingRate(profile.audioSampleRate);
setVideoEncoder(profile.videoCodec);
setAudioEncoder(profile.audioCodec);
}
答案 2 :(得分：0)
您是否拥有AndroidManifest.xml中设置的权限？
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
此外，在尝试致电之前，我遇到过类似的问题：
recorder.reset（）;
在initRecorder（）方法的开头。