我正在开发录像机
我的代码是
package com.app.UI;
import java.io.File;
import java.io.IOException;
import com.app.utils.Logger;
import android.app.Activity;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
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 main extends Activity implements SurfaceHolder.Callback{
/** Called when the activity is first created. */
private static final String TAG = "CAMERA_TUTORIAL";
Button btnStart, btnStop, btnPlay;
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Camera camera;
private boolean previewRunning;
private MediaRecorder mediaRecorder;
private final int maxDurationInMs = 20000;
private final long maxFileSizeInBytes = 500000;
private final int videoFramesPerSecond = 20;
public static String pathname = "/sdcard/recorder.amr";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btnStart = (Button)findViewById(R.id.btnStart);
btnStop = (Button)findViewById(R.id.btnStop);
btnStart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startRecording();
}
});
btnStop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stopRecording();
}
});
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
Logger.debug("surface change");
if (previewRunning){
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
camera.setParameters(p);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
previewRunning = true;
}
catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
Logger.debug("surface created");
camera = Camera.open();
if (camera != null){
Camera.Parameters params = camera.getParameters();
camera.setParameters(params);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
Logger.debug("surface destroy");
camera.stopPreview();
previewRunning = false;
camera.release();
}
public boolean startRecording(){
try {
//camera.unlock();
mediaRecorder = new MediaRecorder();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
mediaRecorder.setMaxDuration(maxDurationInMs);
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/My Recording");
dir.mkdirs();
File tempFile = new File(dir, "myvideo.mp4");
mediaRecorder.setOutputFile(tempFile.getAbsolutePath());
//mediaRecorder.setVideoFrameRate(videoFramesPerSecond);
//mediaRecorder.setVideoSize(surfaceView.getWidth(), surfaceView.getHeight());
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
//mediaRecorder.setMaxFileSize(maxFileSizeInBytes);
mediaRecorder.prepare();
mediaRecorder.start();
return true;
} catch (IllegalStateException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
return false;
} catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
return false;
}
}
public void stopRecording(){
try{
mediaRecorder.stop();
mediaRecorder.release();
}
catch (IllegalStateException e) {
// TODO: handle exception
Logger.debug(""+e.getMessage());
}
//camera.lock();
}
}
在清单文件中我写了
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.app.UI"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".main"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="3" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
</manifest>
现在我的问题是，当我点击开始按钮时，它会显示错误，如
04-25 17:47:03.817: WARN/System.err(23842): java.io.IOException: prepare failed.
04-25 17:47:03.817: WARN/System.err(23842): at android.media.MediaRecorder._prepare(Native Method)
04-25 17:47:03.817: WARN/System.err(23842): at android.media.MediaRecorder.prepare(MediaRecorder.java:458)
04-25 17:47:03.817: WARN/System.err(23842): at com.app.UI.main.startRecording(main.java:143)
04-25 17:47:03.827: WARN/System.err(23842): at com.app.UI.main$1.onClick(main.java:55)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.View.performClick(View.java:2344)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.View.onTouchEvent(View.java:4133)
04-25 17:47:03.827: WARN/System.err(23842): at android.widget.TextView.onTouchEvent(TextView.java:6504)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.View.dispatchTouchEvent(View.java:3672)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:47:03.827: WARN/System.err(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:47:03.837: WARN/System.err(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:47:03.837: WARN/System.err(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:47:03.837: WARN/System.err(23842): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712)
04-25 17:47:03.837: WARN/System.err(23842): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202)
04-25 17:47:03.837: WARN/System.err(23842): at android.app.Activity.dispatchTouchEvent(Activity.java:1987)
04-25 17:47:03.837: WARN/System.err(23842): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696)
04-25 17:47:03.847: WARN/System.err(23842): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
04-25 17:47:03.847: WARN/System.err(23842): at android.os.Handler.dispatchMessage(Handler.java:99)
04-25 17:47:03.847: WARN/System.err(23842): at android.os.Looper.loop(Looper.java:123)
04-25 17:47:03.847: WARN/System.err(23842): at android.app.ActivityThread.main(ActivityThread.java:4203)
04-25 17:47:03.847: WARN/System.err(23842): at java.lang.reflect.Method.invokeNative(Native Method)
04-25 17:47:03.847: WARN/System.err(23842): at java.lang.reflect.Method.invoke(Method.java:521)
04-25 17:47:03.847: WARN/System.err(23842): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-25 17:47:03.847: WARN/System.err(23842): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-25 17:47:03.857: WARN/System.err(23842): at dalvik.system.NativeStart.main(Native Method)
当我点击停止按钮时，它显示错误，如
04-25 17:48:03.827: ERROR/AndroidRuntime(23842): Uncaught handler: thread main exiting due to uncaught exception
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): java.lang.IllegalStateException
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.media.MediaRecorder.stop(Native Method)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.app.UI.main.stopRecording(main.java:159)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.app.UI.main$2.onClick(main.java:64)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.View.performClick(View.java:2344)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.View.onTouchEvent(View.java:4133)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.widget.TextView.onTouchEvent(TextView.java:6504)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.View.dispatchTouchEvent(View.java:3672)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.app.Activity.dispatchTouchEvent(Activity.java:1987)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.os.Handler.dispatchMessage(Handler.java:99)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.os.Looper.loop(Looper.java:123)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at android.app.ActivityThread.main(ActivityThread.java:4203)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at java.lang.reflect.Method.invokeNative(Native Method)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at java.lang.reflect.Method.invoke(Method.java:521)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-25 17:48:03.837: ERROR/AndroidRuntime(23842): at dalvik.system.NativeStart.main(Native Method)
我必须做什么，我提到很多网站，但我的问题无法解决， 请朋友帮帮我
我在1.6b设备和2.2 emulater上进行了测试
答案 0 :(得分：0)
1.<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
2.public int SELECT_VIDEO_FILE = 2, REQUEST_CAMERA_VIDEO = 3;
final CharSequence[] items = {"Take Video", "Choose from Library",
"Cancel"};
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Add Video!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Take Video")) {
userChoosenTask = "Take Video";
if (result)
cameraIntentVideos();
} else
if (items[item].equals("Choose from Library")) {
userChoosenTask = "Choose from Library";
if (result)
galleryIntentVideos();
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
3.private void cameraIntentVideos() {
Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
takeVideoIntent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 30);
if (takeVideoIntent.resolveActivity(getActivity().getPackageManager()) != null) {
String fileName = "myvideo.mp4";
ContentValues values = new ContentValues();
values.put(MediaStore.Video.Media.TITLE, fileName);
videoUri = getActivity().getContentResolver().insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
values);
takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, videoUri);
startActivityForResult(takeVideoIntent,REQUEST_CAMERA_VIDEO);
}
}
4. private void galleryIntentVideos() {
Intent intentPickVideo = new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intentPickVideo, SELECT_VIDEO_FILE);
5. @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_CAMERA_VIDEO) {
onCaptureVideoResult(data);
} else if (requestCode == SELECT_VIDEO_FILE) {
onSelectVideoFromGalleryResult(data);
} else {
Toast.makeText(getActivity(), "You haven't picked Image", Toast.LENGTH_SHORT).show();
}
}
}
6.// TODO: 5/31/2017 capture video
public void onCaptureVideoResult(Intent data) {
String[] projection = {MediaStore.Video.Media.DATA};
Cursor cursor = getActivity().managedQuery(videoUri, projection, null, null, null);
int column_index_data = cursor.getColumnIndexOrThrow(
MediaStore.Video.Media.DATA);
cursor.moveToFirst();
PicturePath = cursor.getString(column_index_data);
String filename=PicturePath.substring(PicturePath.lastIndexOf("/")+1);
txtFilePath.setText(filename);
}
7. // TODO: 5/31/2017 video from gallery
private void onSelectVideoFromGalleryResult(Intent data) {
if (data != null) {
try {
Uri uri = data.getData();
String[] filePathColumn = {MediaStore.Video.Media.DATA};
Cursor cursor = getActivity().getContentResolver().query(uri,
filePathColumn, null, null, null);
if (cursor == null || cursor.getCount() < 1) {
return; // no cursor or no record. DO YOUR ERROR HANDLING
}
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
PicturePath = cursor.getString(columnIndex);
cursor.close(); // close cursor
if (PicturePath != null) {
MediaPlayer mp = MediaPlayer.create(getActivity(), Uri.parse(PicturePath));
int duration = mp.getDuration();
mp.release();
if ((duration / 1000) > 30) {
Toast.makeText(getActivity(), "Please Select video with maximum 30 seconds limit", Toast.LENGTH_SHORT).show();
} else {
//runVideo(PicturePath);
String filename=PicturePath.substring(PicturePath.lastIndexOf("/")+1);
txtFilePath.setText(filename);
}
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(), "No Data Found", Toast.LENGTH_SHORT).show();
}
}
答案 1 :(得分：-1)
将此添加到清单：<uses-permission android:name="android.permission.RECORD_VIDEO"/>