相机preVIEW和GPS Android中读 [英] Camera Preview and GPS reading in Android
本文介绍了相机preVIEW和GPS Android中读的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试着写一个Android应用程序。现在我写了一些code可显示相机prewiew从传感器获得的装置（GPS reciver）的数据。
I tried to write an android app. For now I wrote some code that display camera prewiew and gets data from sensors on the device (gps reciver).
当我运行单独的应用程序（如摄像头preVIEW作为一个应用程序和应用，获取GPS数据为秒）code一切正常。但是，当我尝试这两个模块整合 - 全球定位系统停止工作;它看起来像听者没有得到任何数据，而且由于我试图它在模拟器上所以这个原因我已经初始化的纬度和经度的值，这样的情况下，一个位置没有收到它不给空。
When I run the code in separate app (like camera preview as one app and application that gets gps data as a second) everything is OK. But when I try to integrate this two modules - GPS stop working; it looks like the listener doesn't get any data and moreover as i am trying it on the emulator so for that reason i have initialized the latitude and longitude with a value so that in case a location is not recieved it does not give null.
应用程序应的方式，只要照片被点击，并保存到SD卡，在同样的时间，我应该得到这也将需要保存在SD卡上的设备的GPS定位功能。你是否有一些类似的问题？
The app should function in a way that as soon as the photograph is clicked and saved to the sdcard ,at the very same time i should get the gps location of the device which would also be needed to save on the sd card.Did You had some similar problems?
在code是这样的：
public class MainActivity extends Activity implements CameraCallback{
private FrameLayout cameraholder = null;
private CameraSurface camerasurface = null;
LocationManager mLocationManager;
LocationListener mlocListener;
Double lat;
Double lng;
/* Class My Location Listener */
public class MyLocationListener implements LocationListener
{
public void onLocationChanged(Location loc)
{
String Text = "My current location is:\n" + "Latitude = " + loc.getLatitude() + "\nLongitude = " + loc.getLongitude()+ "\nAccuracy = "+ loc.getAccuracy();
Toast.makeText(MainActivity.this,Text,Toast.LENGTH_SHORT).show();
}
public void onProviderDisabled(String provider)
{
Toast.makeText(MainActivity.this,"Gps Disabled",Toast.LENGTH_SHORT ).show();
}
public void onProviderEnabled(String provider)
{
/*Toast.makeText(getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();*/
Toast.makeText(MainActivity.this,"Gps Enabled",Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider, int status, Bundle extras){}
{
Toast.makeText(MainActivity.this, "Provider status changed",Toast.LENGTH_LONG).show();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
cameraholder = (FrameLayout)findViewById(R.id.camera_preview);
mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
setupPictureMode();
((ImageButton)findViewById(R.id.takepicture)).setOnClickListener(onButtonClick);
((ImageButton)findViewById(R.id.about)).setOnClickListener(onButtonClick);
}
private void setupPictureMode(){
camerasurface = new CameraSurface(this);
cameraholder.addView(camerasurface, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
camerasurface.setCallback(this);
}
@Override
public void onJpegPictureTaken(byte[] data, Camera camera) {
try
{
long currentTime = System.currentTimeMillis();
FileOutputStream outStream = new FileOutputStream(String.format(
"/sdcard/%d.jpg",currentTime));
outStream.write(data);
outStream.close();
//mLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
/*mlocListener = new MyLocationListener();
mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);*/
Location location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) {
lat = 13.6972 * 1E6;
lng = 100.5150 * 1E6;
} else { // get real location if can retrieve the location sent by DDMS or GPS
lat = location.getLatitude() * 1E6;
lng = location.getLongitude() * 1E6;
}
//GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue());
System.out.println("Latitude is :"+lat+" Logitude is "+lng);
mLocationManager.removeUpdates(mlocListener);
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
camerasurface.startPreview();
}
}
相机preVIEW code如下：
The cameraPreview code looks like:
public class CameraSurface extends SurfaceView implements SurfaceHolder.Callback, OnGestureListener{
private Camera camera = null;
private SurfaceHolder holder = null;
private CameraCallback callback = null;
private GestureDetector gesturedetector = null;
public CameraSurface(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
initialize(context);
}
public CameraSurface(Context context)
{
super(context);
initialize(context);
}
public CameraSurface(Context context, AttributeSet attrs)
{
super(context, attrs);
initialize(context);
}
private void initialize(Context context)
{
holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
gesturedetector = new GestureDetector(this);
}
public void setCallback(CameraCallback callback){
this.callback = callback;
}
public void startPreview(){
camera.startPreview();
}
public void startTakePicture(){
camera.autoFocus(new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
takePicture();
}
});
}
public void takePicture() {
camera.takePicture(
new ShutterCallback() {
@Override
public void onShutter(){
if(null != callback) callback.onShutter();
}
},
new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera){
if(null != callback) callback.onRawPictureTaken(data, camera);
}
},
new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera){
if(null != callback) callback.onJpegPictureTaken(data, camera);
}
});
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
if(null != camera)
{
camera.startPreview();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
camera.setPreviewCallback(new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
if(null != callback) callback.onPreviewFrame(data, camera);
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}}
清单文件看起来是这样的：
The manifest file looks this way:
<?xml version="1.0" encoding="utf-8"?>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name="com.varma.samples.camera.ui.MainActivity"
android:label="@string/app_name"
android:screenOrientation="landscape"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="10" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
任何帮助将是AP preciated ..
Any help would be appreciated..
推荐答案
按我的理解，你要的是相机应用程序产生地理标签（纬度/长写）JPEG图像。这里是code你如何achive它。
As per my understanding what you want is Camera application which produces geotagged(lat/long written) jpeg image. Here is the code for how you can achive it.
在AndroidManifest.xml中需要的权限都是
Permission needed in AndroidManifest.xml are
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
<uses-permission android:name="android.permission.CAMERA" >
</uses-permission>
下面是活动文件
public class TaggedImageActivity extends Activity implements SurfaceHolder.Callback, OnClickListener{
static final int FOTO_MODE = 0;
private LocationManager locationManager;
private SurfaceView surefaceView;
private SurfaceHolder surefaceHolder;
private LocationListener locationListener;
private Camera camera;
private String make;
private String model;
private String imei;
private Location thislocation;
double lat ;
double lon ;
private boolean previewRunning = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
surefaceView = (SurfaceView) findViewById(R.id.surface_camera);
surefaceView.setOnClickListener(this);
surefaceHolder = surefaceView.getHolder();
surefaceHolder.addCallback(this);
surefaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
locationListener = new LocationListener() {
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
public void onLocationChanged(Location location) {
TaggedImageActivity.this.gpsLocationReceived(location);
lat = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLatitude();
lon = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLongitude();
}
};
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria locationCritera = new Criteria();
locationCritera.setAccuracy(Criteria.ACCURACY_COARSE);
locationCritera.setAltitudeRequired(false);
locationCritera.setBearingRequired(false);
locationCritera.setCostAllowed(true);
locationCritera.setPowerRequirement(Criteria.NO_REQUIREMENT);
String providerName = locationManager.getBestProvider(locationCritera, true);
if (providerName != null && locationManager.isProviderEnabled(providerName)) {
locationManager.requestLocationUpdates(providerName, 20000, 100, TaggedImageActivity.this.locationListener);
} else {
// Provider not enabled, prompt user to enable it
Toast.makeText(TaggedImageActivity.this, R.string.please_turn_on_gps, Toast.LENGTH_LONG).show();
Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
TaggedImageActivity.this.startActivity(myIntent);
}
if(locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER)!=null){
lat = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLatitude();
lon = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLongitude();
}
else if (locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER)!=null){
Log.d("TAG", "Inside NETWORK");
lat = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLatitude();
lon = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLongitude();
}
else{
Log.d("TAG", "else +++++++ ");
lat = -1;
lon = -1;
}
}
protected void gpsLocationReceived(Location location) {
thislocation = location;
}
AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback(){
@Override
public void onAutoFocus(boolean arg0, Camera arg1) {
Toast.makeText(getApplicationContext(), "'It is ready to take the photograph !!!", Toast.LENGTH_SHORT).show();
}};
Camera.PictureCallback pictureCallBack = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
if(data != null){
Intent imgIntent = new Intent();
storeByteImage(data);
camera.startPreview();
setResult(FOTO_MODE, imgIntent);
}
}
};
public boolean storeByteImage(byte[] data){
String filename = Environment.getExternalStorageDirectory()+String.format("/%d.jpeg", System.currentTimeMillis());
Log.d("TAG", "filename = "+ filename);
try {
FileOutputStream fileOutputStream = new FileOutputStream(filename);
try {
fileOutputStream.write(data);
Log.d("TAG", "Image file created, size in bytes = "+ data.length);
} catch (IOException e) {
e.printStackTrace();
}
fileOutputStream.flush();
fileOutputStream.close();
Log.e("TAG", "lat ="+ lat+" lon :"+ lon);
ExifInterface exif = new ExifInterface(filename);
createExifData(exif,lat , lon);
exif.saveAttributes();
Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null,null);
while (cursor.moveToNext()) {
String imagefilename = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
Long latitide = cursor.getLong(cursor.getColumnIndex(MediaStore.Images.Media.LATITUDE));
Long longitude = cursor.getLong(cursor.getColumnIndex(MediaStore.Images.Media.LONGITUDE));
Log.d("TAG", "filepath: "+imagefilename+" latitude = "+latitide+" longitude = "+longitude);
}
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
public void createExifData(ExifInterface exif, double lattude, double longitude){
if (lattude < 0) {
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "S");
lattude = -lattude;
} else {
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "N");
}
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE,
formatLatLongString(lattude));
if (longitude < 0) {
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "W");
longitude = -longitude;
} else {
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "E");
}
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE,
formatLatLongString(longitude));
try {
exif.saveAttributes();
} catch (IOException e) {
e.printStackTrace();
}
make = android.os.Build.MANUFACTURER; // get the make of the device
model = android.os.Build.MODEL; // get the model of the divice
exif.setAttribute(ExifInterface.TAG_MAKE, make);
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
imei = telephonyManager.getDeviceId();
exif.setAttribute(ExifInterface.TAG_MODEL, model+" - "+imei);
exif.setAttribute(ExifInterface.TAG_DATETIME, (new Date(System.currentTimeMillis())).toString()); // set the date & time
Log.d("TAG", "Information : lat ="+ lattude+" lon ="+ longitude+" make = "+make+" model ="+ model+" imei="+imei+" time ="+(new Date(System.currentTimeMillis())).toString());
}
private static String formatLatLongString(double d) {
StringBuilder b = new StringBuilder();
b.append((int) d);
b.append("/1,");
d = (d - (int) d) * 60;
b.append((int) d);
b.append("/1,");
d = (d - (int) d) * 60000;
b.append((int) d);
b.append("/1000");
return b.toString();
}
protected boolean isRouteDisplayed() {
return false;
}
@Override
public void onClick(View v) {
camera.takePicture(null, pictureCallBack, pictureCallBack);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if(previewRunning){
camera.stopPreview();
}
try {
camera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
camera.startPreview();
previewRunning = true;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
previewRunning = false;
camera.release();
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.cameramenu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.item01:
Toast.makeText(this, "Pressed !", Toast.LENGTH_LONG).show(); break;
case R.id.item03:
System.exit(0);
break;
}
return true;
}
@Override
protected void onStop() {
super.onStop();
LocationManager locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
locationManager.removeUpdates(this.locationListener);
}}
这篇关于相机preVIEW和GPS Android中读的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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