我已经尝试了很多来源，检查了很多答案，但我仍然无法理解我的代码是什么问题。 我正在尝试使用带有手电筒开/关模式的切换按钮。
package ium.earlywarning;
import ium.earlywarning.widget.GIFView;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.LayoutParams;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.ToggleButton;
public class SecondActivity extends ActionBarActivity
{
public static String APERTO = "allaperto";
@SuppressWarnings("unused")
private static String LOG_TAG = SecondActivity.class.getName();
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a {@link FragmentPagerAdapter}
* derivative, which will keep every loaded fragment in memory. If this
* becomes too memory intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
final ActionBar actionBar = getSupportActionBar();
// Specify that tabs should be displayed in the action bar.
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create a tab listener that is called when the user changes tabs.
ActionBar.TabListener tabListener = new ActionBar.TabListener()
{
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft)
{
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft)
{
// hide the given tab
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft)
{
// probably ignore this event
}
};
/**
* Aggiunge i tabs:
*/
actionBar.addTab(actionBar.newTab().setText("Chiuso").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("Aperto").setTabListener(tabListener));
if (getIntent().getBooleanExtra(APERTO, false))
{
getSupportActionBar().setSelectedNavigationItem(1);
}
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
{
@Override
public void onPageSelected(int position)
{
// When swiping between pages, select the
// corresponding tab.
getSupportActionBar().setSelectedNavigationItem(position);
}
});
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter
{
public SectionsPagerAdapter(FragmentManager fm)
{
super(fm);
}
@Override
public Fragment getItem(int position)
{
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class
// below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount()
{
// Show 3 total pages.
return 2;
}
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment
{
private boolean mIsTorchPresent = false;
private Camera mCamera = null;
private Camera.Parameters mCameraParameters;
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section number.
*/
public static PlaceholderFragment newInstance(int sectionNumber)
{
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public void onPause()
{
if (mCamera != null)
{
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
super.onPause();
}
public PlaceholderFragment()
{
}
public void onToggleClicked(View v)
{
// Is the toggle on?
boolean on = ((ToggleButton) v).isChecked();
if (on)
{
Log.i("info", "torch is turn on!");
mCameraParameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(mCameraParameters);
mCamera.startPreview();
}
else
{
Log.i("info", "torch is turn off!");
mCameraParameters.setFlashMode(Parameters.FLASH_MODE_OFF);
mCamera.setParameters(mCameraParameters);
mCamera.stopPreview();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
final View rootView = inflater.inflate(R.layout.fragment_second, container, false);
final PackageManager pm = getActivity().getPackageManager();
if (!isCameraSupported(pm))
{
AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create();
alertDialog.setTitle("No Camera");
alertDialog.setMessage("The device's doesn't support camera.");
alertDialog.setButton(RESULT_OK, "OK", new DialogInterface.OnClickListener()
{
public void onClick(final DialogInterface dialog, final int which)
{
Log.e("err", "The device's doesn't support camera.");
}
});
alertDialog.show();
}
///////////////////////////////////////////////////////////////////////////
////The line:
mCamera = Camera.open();
///////////////////////////////////////////////////////////////////////////
// Controllo se è presente la torcia:
mIsTorchPresent = getActivity().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
// ToggleButton torcia = (ToggleButton)
// rootView.findViewById(R.id.torcia_btn);
Bundle args = getArguments();
final Integer[] gifIDs;
switch (args.getInt(ARG_SECTION_NUMBER))
{
case 1:
gifIDs = new Integer[] { R.drawable.sciencebitch,
R.drawable.lol1, R.drawable.lol2, R.drawable.lol3,
R.drawable.lol4 };
break;
case 2:
gifIDs = new Integer[] { R.drawable.sciencebitch,
R.drawable.lol1 };
break;
default:
gifIDs = new Integer[] { R.drawable.pic1, R.drawable.pic2 };
}
LinearLayout linearLayout = (LinearLayout) rootView.findViewById(R.id.thumb_linearlayout);
OnClickListener textViewOnClickListener = new OnClickListener()
{
@Override
public void onClick(View v)
{
// display the images selected
GIFView gifView = (GIFView) rootView.findViewById(R.id.main_gif);
String tvValue = (String) ((TextView) v).getText();
gifView.setMovieResource(gifIDs[Integer.parseInt(tvValue)]);
}
};
int i = 0;
for (int id : gifIDs)
{
TextView tv = (TextView) inflater.inflate(R.layout.list_numb_tv, null);
tv.setText(i + "");
i++;
// GIFView gv = (GIFView) inflater.inflate(R.layout.thumb_gif,
// null);
// gv.setMovieResource(id);
// gv.setOnClickListener(gifOnClickListener);
tv.setOnClickListener(textViewOnClickListener);
linearLayout.addView(tv);
TextView spacer = new TextView(getActivity());
spacer.setLayoutParams(new LayoutParams(4, 2));
spacer.setText(" ");
linearLayout.addView(spacer);
}
return rootView;
}
private boolean isCameraSupported(PackageManager packageManager)
{
// if device support camera?
if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA))
{
return true;
}
return false;
}
}
}
当我运行它时，我得到一个运行时异常：
java.lang.RuntimeException: Fail to connect to camera service
在我的Android清单中，我已经定义了这些权限：
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
我已经达到了这个https://code.google.com/p/torch/但是来源看起来和我一样。在camera.open（）上抛出异常。