Android Open Source - AB-ITS-Inc-Flashlight-Android Flashlight Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
  This file is part of AB ITS Inc Flashlight Android.
/*  w w w.  j a va2  s.c  om*/
  AB ITS Inc Flashlight Android is free software: you can redistribute it and/or 
  modify it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  AB ITS Inc Flashlight Android is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
  more details.

  You should have received a copy of the GNU General Public License
  along with AB ITS Inc Flashlight Android.  
  If not, see <http://www.gnu.org/licenses/>. 
 */

package com.abitsinc.andr;

import android.app.Activity;
import android.graphics.Color;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class FlashlightActivity extends Activity {

  private static final String TAG = "ABITSIncFlashlight";
  private android.hardware.Camera cam = null;
  private String oldFlashMode = null;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Log.d(TAG, "onCreate - starting...");
    setContentView(R.layout.flashlight);
    Log.d(TAG, "cam " + (cam == null));
    initCamera();
  }

  @Override
  protected void onResume() {
    super.onResume();

    Log.d(TAG + " onResume", "starting...");
    initCamera();
  }

  @Override
  protected void onPause() {
    super.onPause();

    Log.d(TAG, "onPause " + (cam != null));
    if (cam != null) {
      Parameters campam = cam.getParameters();
      if (oldFlashMode != null)
        campam.setFlashMode(oldFlashMode);
      cam.stopPreview();
      cam.release();
      cam = null;
    }
  }

  private void initCamera() {
    if (cam != null) {
      Log.d(TAG, "cam not null during initCam");
      return; // should not happen
    }
    TextView txtStatus = (TextView) findViewById(R.id.statusText);

    int numCameras = Camera.getNumberOfCameras();
    if (numCameras <= 0) {
      Log.d(TAG, "number of cameras " + numCameras);
      this.useScreenAsFlashlight(txtStatus);
    } else {
      try { // some devices throw an exception here instead :(
        cam = Camera.open(0);
        if (cam != null) {
          completeCameraSetup(txtStatus);
        } else {
          throw new Exception("Unable to open camera");
        }
      } catch (Exception e) {
        Log.d(TAG, "Camera exception " + e.toString());
        this.useScreenAsFlashlight(txtStatus);
      }
    }
  }

  private void completeCameraSetup(TextView txtStatus) {
    Parameters campam = cam.getParameters();
    oldFlashMode = campam.getFlashMode();
    Log.d(TAG, "flashMode1 " + oldFlashMode);
    if (oldFlashMode == null)
      oldFlashMode = Parameters.FLASH_MODE_AUTO;
    campam.setFlashMode(Parameters.FLASH_MODE_TORCH);
    cam.setParameters(campam);
    txtStatus.setText(R.string.status_set);
    cam.startPreview();
    String tmpFlashMode = campam.getFlashMode();
    if (tmpFlashMode == null) {
      Log.d(TAG, "flashMode not supported");
      this.useScreenAsFlashlight(txtStatus);
    }
  }

  private void useScreenAsFlashlight(TextView txtStatus) {
    txtStatus.setText(R.string.status_nld);
    TextView txtBkupLight = (TextView) findViewById(R.id.tvBkupLightSrc);
    txtBkupLight.setBackgroundColor(Color.WHITE);
  }
}

Java Source Code List

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