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我試圖編寫一個android應用程序。現在我寫了一些代碼來顯示相機預覽，並從設備上的傳感器（gps reciver）獲取數據。Android中的攝像頭預覽和GPS讀取
當我在單獨的應用程序中運行代碼（如相機預覽作爲一個應用程序和獲取gps數據作爲第二個應用程序），一切正常。但是，當我嘗試整合這兩個模塊 - GPS停止工作;它看起來像監聽器沒有得到任何數據，而且我正在模擬器上嘗試它，所以出於這個原因我已經初始化了經度和緯度的值，以便在沒有收到位置的情況下它不會給出空值。
該應用程序應該以一種方式運行，只要照片被點擊並保存到SD卡，同時我應該得到設備的GPS位置，這也將需要保存在SD卡上.Did你有類似的問題嗎？
的代碼看起來是這樣的：
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();
}
}
的cameraPreview代碼如下所示：
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;
}}
清單文件看起來是這樣的：
<?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" />
任何幫助，將不勝感激..
可能你是對的裏諾我會嘗試刪除該語句。而且最主要的問題是我不也可以看到Println語句，正如你在OnJpegPictureTaken（）中看到的那樣，我正在初始化lat和long的值，以便我得到一些東西，即使它沒有使用gps位置。 – 2011-06-15 13:30:57