我正在使用此处的代码[1]在Android 4.4上拍照：{4}}“4。教程：使用相机API”并使用Eclipse“全屏活动”作为模板。
第一张照片是正常的，但之后后续照片太暗无法使用。
我搜索过但无法修复它。我在这里做错了什么？
我的主要活动类
/**
* An example full-screen activity that shows and hides the system UI (i.e.
* status bar and navigation/system bar) with user interaction.
*
* @see SystemUiHider
*/
public class DashboardActivity extends Activity {
static final String DEBUG_TAG = "fsym";
static String fileName = "";
private Camera camera;
private int cameraId = 0;
static long numPics = 1;
private TextView results;
private ImageView displayArea;
float dpHeight, dpWidth;
/**
* Whether or not the system UI should be auto-hidden after
* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
*/
private static final boolean AUTO_HIDE = true;
/**
* If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
* user interaction before hiding the system UI.
*/
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
/**
* If set, will toggle the system UI visibility upon interaction. Otherwise,
* will show the system UI visibility upon interaction.
*/
private static final boolean TOGGLE_ON_CLICK = true;
/**
* The flags to pass to {@link SystemUiHider#getInstance}.
*/
private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;
/**
* The instance of the {@link SystemUiHider} for this activity.
*/
private SystemUiHider mSystemUiHider;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(DashboardActivity.DEBUG_TAG, "onCreate called");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
dpHeight = displayMetrics.heightPixels / displayMetrics.density;
dpWidth = displayMetrics.widthPixels / displayMetrics.density;
final View controlsView = findViewById(R.id.fullscreen_content_controls);
final View contentView = findViewById(R.id.fullscreen_content);
results = (TextView) findViewById(R.id.resultTxtBox);
displayArea = (ImageView) findViewById(R.id.imagePanel);
// Set up an instance of SystemUiHider to control the system UI for
// this activity.
mSystemUiHider = SystemUiHider.getInstance(this, contentView, HIDER_FLAGS);
mSystemUiHider.setup();
mSystemUiHider.setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
// Cached values.
int mControlsHeight;
int mShortAnimTime;
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
public void onVisibilityChange(boolean visible) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
// If the ViewPropertyAnimator API is available
// (Honeycomb MR2 and later), use it to animate the
// in-layout UI controls at the bottom of the
// screen.
if (mControlsHeight == 0) {
mControlsHeight = controlsView.getHeight();
}
if (mShortAnimTime == 0) {
mShortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
}
controlsView.animate().translationY(visible ? 0 : mControlsHeight).setDuration(mShortAnimTime);
} else {
// If the ViewPropertyAnimator APIs aren't
// available, simply show or hide the in-layout UI
// controls.
controlsView.setVisibility(visible ? View.VISIBLE : View.GONE);
}
if (visible && AUTO_HIDE) {
// Schedule a hide().
delayedHide(AUTO_HIDE_DELAY_MILLIS);
}
}
});
// Set up the user interaction to manually show or hide the system UI.
contentView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (TOGGLE_ON_CLICK) {
mSystemUiHider.toggle();
} else {
mSystemUiHider.show();
}
}
});
// Upon interacting with UI controls, delay any scheduled hide()
// operations to prevent the jarring behavior of controls going away
// while interacting with the UI.
findViewById(R.id.takePicBtn).setOnTouchListener(mDelayHideTouchListener);
results.setOnTouchListener(mDelayHideTouchListener);
// do we have a camera?
if (!getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG)
.show();
} else {
cameraId = findFrontFacingCamera();
if (cameraId < 0) {
Toast.makeText(this, "No front facing camera found.",
Toast.LENGTH_LONG).show();
} else {
camera = Camera.open(cameraId);
}
}
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
Log.d(DashboardActivity.DEBUG_TAG, "onPostCreate called");
super.onPostCreate(savedInstanceState);
uiUpdateRunnable.run();
// Trigger the initial hide() shortly after the activity has been
// created, to briefly hint to the user that UI controls
// are available.
delayedHide(100);
}
/**
* Touch listener to use for in-layout UI controls to delay hiding the
* system UI. This is to prevent the jarring behavior of controls going away
* while interacting with activity UI.
*/
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (AUTO_HIDE) {
delayedHide(AUTO_HIDE_DELAY_MILLIS);
}
return false;
}
};
Handler mHideHandler = new Handler();
Runnable mHideRunnable = new Runnable() {
@Override
public void run() {
mSystemUiHider.hide();
}
};
/**
* Schedules a call to hide() in [delay] milliseconds, canceling any
* previously scheduled calls.
*/
private void delayedHide(int delayMillis) {
Log.d(DashboardActivity.DEBUG_TAG, "delayedHide called");
mHideHandler.removeCallbacks(mHideRunnable);
mHideHandler.postDelayed(mHideRunnable, delayMillis);
}
Handler uiUpdatehandler = new Handler();
Runnable uiUpdateRunnable = new Runnable() {
@Override
public void run() {
if (fileName!=null && fileName.trim().length()>0){
displayArea.setImageBitmap(BitmapFactory.decodeFile(fileName));
displayArea.setRotation(-90);
displayArea.setScaleType(ScaleType.CENTER_INSIDE);
}
results.setText("Ratio:"+FaceAnalyzer.measureFace(fileName));
//results.invalidate();
//displayArea.invalidate();
uiUpdatehandler.postDelayed(uiUpdateRunnable,1000);
}
};
public void takePicture(View view){
Log.d(DashboardActivity.DEBUG_TAG, "takePicture called");
camera.takePicture(null, null, new PhotoHandler(getApplicationContext()));
}
public void quitApp(View view){
uiUpdatehandler.removeCallbacks(uiUpdateRunnable);
finish();
System.exit(0);
}
private int findFrontFacingCamera() {
Log.d(DashboardActivity.DEBUG_TAG, "findFrontfacingCamera called");
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
Log.d(DEBUG_TAG, "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
@Override
protected void onPause() {
Log.d(DashboardActivity.DEBUG_TAG, "onPause called");
if (camera != null) {
camera.release();
camera = null;
}
super.onPause();
}
}
我的PhotoHandler：
public class PhotoHandler implements PictureCallback {
private final Context context;
public PhotoHandler(Context context) {
Log.d(DashboardActivity.DEBUG_TAG, "Photohandler contstructor called");
this.context = context;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.d(DashboardActivity.DEBUG_TAG, "onPicturetaken called");
File pictureFileDir = getDir();
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
Log.d(DashboardActivity.DEBUG_TAG, "Can't create directory to save image.");
Toast.makeText(context, "Can't create directory to save image.",
Toast.LENGTH_LONG).show();
return;
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = dateFormat.format(new Date());
String photoFile = "Picture_" + date +"_" +DashboardActivity.numPics+".jpg";
String filename = pictureFileDir.getPath() + File.separator + photoFile;
File pictureFile = new File(filename);
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Toast.makeText(context, "New Image saved:" + photoFile,
Toast.LENGTH_LONG).show();
Log.d(DashboardActivity.DEBUG_TAG, "New Image saved:" + photoFile);
DashboardActivity.fileName = filename;
DashboardActivity.numPics++;
} catch (Exception error) {
Log.d(DashboardActivity.DEBUG_TAG, "File" + filename + "not saved: "
+ error.getMessage());
Toast.makeText(context, "Image could not be saved.",
Toast.LENGTH_LONG).show();
}
}
private File getDir() {
Log.d(DashboardActivity.DEBUG_TAG, "getDir called");
File sdDir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return new File(sdDir, "FacialSymmetryAnalyzer");
}
}
我在这里做错了什么？