open Camera - Android android.hardware

Android examples for android.hardware:Open Camera

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Description

open Camera

Demo Code

import java.lang.Thread.UncaughtExceptionHandler;

import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;

public class Main {

  private static UncaughtExceptionHandler sOriginExceptionHandler;
  private static UncaughtExceptionHandler sExceptionHandler;
  private static Camera sCamera = null;
  private static final String TAG = "CameraUtil";
  private static Camera.CameraInfo sCameraInfo = null;

  public static Camera open() {
    initExcepHandler();//from  ww w .  j  a va  2  s  .co  m
    try {
      int cameraId = -1;

      Camera.CameraInfo info = new Camera.CameraInfo();
      for (int id = 0; id < Camera.getNumberOfCameras(); id++) {
        Camera.getCameraInfo(id, info);
        if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
          cameraId = id;
          break;
        }
      }
      sCamera = Camera.open(cameraId);
      sCameraInfo = info;
      Log.i(TAG, "open:" + sCamera);
      return sCamera;
    } catch (Exception e) {
      Log.e(TAG, e.toString(), e);
      return null;
    }
  }



  public static Camera.CameraInfo getCameraInfo() {
    return sCameraInfo;
  }

  private static void initExcepHandler() {
    if (sExceptionHandler != null)
      return;
    sOriginExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
    sExceptionHandler = new UncaughtExceptionHandler() {
      @Override
      public void uncaughtException(Thread thread, final Throwable ex) {
        close();
        if (sOriginExceptionHandler != null) {
          sOriginExceptionHandler.uncaughtException(thread, ex);
        }
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
          @Override
          public void run() {
            if (ex instanceof Error) {
              throw (Error) ex;
            } else if (ex instanceof RuntimeException) {
              throw (RuntimeException) ex;
            } else {
              throw new Error(ex);
            }
          }
        });
      }
    };
    Thread.setDefaultUncaughtExceptionHandler(sExceptionHandler);
  }
  public static void close() {
    if (sCamera == null)
      return;
    try {
      sCamera.stopPreview();
    } finally {
      sCamera.release();
      sCamera = null;
    }
  }
}

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