Android Open Source - SimpleFlashlight-Eclipse Main Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.wolfhorse.simpleflashlight;
//  ww w  . j a v  a2s .co m
import java.io.IOException;

import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ToggleButton;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;

/**
 * @author TimSexton
 * July 15, 2014
 * @version 1.4
 * 
 */

public class MainActivity extends ActionBarActivity implements Callback {

  private final Context mContext = this;
  private PackageManager mPackageManager = null;
  private Camera mCamera = null;
  private ToggleButton mButton;
  private SurfaceView mPreview = null;
  private SurfaceHolder mHolder = null;
  private Animation mAnimScale = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mPackageManager = mContext.getPackageManager();
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
        
        // Verify our required hardware exists on this device.
        isCameraSupported();
        isFlashSupported();

        // Setup button animation to zoom out and in when clicked
        // to give the user more visual button click feedback.
        mAnimScale = AnimationUtils.loadAnimation(this, R.animator.anim_scale);    
                  
    }
    
    @Override
    protected void onDestroy() {
      super.onDestroy();
      mAnimScale = null;
      mPackageManager = null;
    }
    
    @Override
    protected void onStart() {
      super.onStart();
      
        if (mPreview == null)
          mPreview = (SurfaceView) findViewById(R.id.preview1);
      
      if (mPreview != null)
        mHolder = mPreview.getHolder();
      
      if (mHolder != null)
        mHolder.addCallback(this);
      
      if (mButton == null)
        mButton = (ToggleButton) findViewById(R.id.toggleButton1);
      
    if (mButton != null)
    {
      mButton.bringToFront();
      mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
              // Turn the flashlight on/off
              view.startAnimation(mAnimScale);
              toggleFlash(mButton.isChecked());
            }
        });
    }
    }
    
    @Override
    protected void onStop() {
      super.onStop();
               
    if (mHolder != null)
      mHolder.removeCallback(this);
    
    mHolder = null;
    mPreview = null;
    }
    
    @Override
    protected void onResume()
    {
      OpenCamera();      
      
    // Default the light to the ToggleButton's check state. (ON by default).
      // This will reset to the default if the user closes the app with the back button, but not when switching apps.
      if (mButton != null)
        toggleFlash(mButton.isChecked());
      
      super.onResume();
    }
    
    @Override
    protected void onPause()
    {
      CloseCamera();
      super.onPause();
    }
    
    private void CloseCamera(){
        if (mCamera != null)
        {
            mCamera.release();
            mCamera = null;
        }
    }
    
    private void OpenCamera(){
      CloseCamera();
      mCamera = Camera.open();
    }
    
    /**
     * @param packageManager
     * @return true <b>if the device supports camera flash</b><br/>
     * false <b>if the device doesn't support camera flash</b>
     */
    private boolean isFlashSupported(){ 
     // if device support camera flash?
     if (mPackageManager == null)
          return false;
        
     if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
      return true;
     }
     else
     {
      AlertDialog alertDialog = new AlertDialog.Builder(mContext).create();
      alertDialog.setTitle("No Camera Flash");
        alertDialog.setMessage("This device's camera doesn't support flash.");
      alertDialog.setButton(RESULT_OK, "OK", new DialogInterface.OnClickListener() {
      public void onClick(final DialogInterface dialog, final int which) { 
        Log.e("err", "This device's camera doesn't support flash.");
      }
      });
      alertDialog.show();
     }
     return false;
    }

    /**
     * @param packageManager
     * @return true <b>if the device supports camera</b><br/>
     * false <b>if the device doesn't support camera</b>
     */
    private boolean isCameraSupported(){
     // if device support camera?
     if (mPackageManager == null)
       return false;
      
     if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
      return true;
     } 
     else
     {
        AlertDialog alertDialog = new AlertDialog.Builder(mContext).create();
        alertDialog.setTitle("No Camera");
           alertDialog.setMessage("This device doesn't support a camera.");
           alertDialog.setButton(RESULT_OK, "OK", new DialogInterface.OnClickListener() {
               public void onClick(final DialogInterface dialog, final int which) { 
                Log.e("err", "This device doesn't support a camera.");
               }
            });
        alertDialog.show();
     }
     return false;
    }
     
    /**
     * Toggles the camera's flash.
     * @param turnLightOn
     */
    private void toggleFlash(boolean turnLightOn)
    {
    if (mCamera != null)
    {
      final Parameters paramaters = mCamera.getParameters();
        if(turnLightOn)
        {
        paramaters.setFlashMode(Parameters.FLASH_MODE_TORCH);
          mCamera.setParameters(paramaters);
          mCamera.startPreview();
        Log.i("info", "Flash is ON...");
        }
        else
        {
        paramaters.setFlashMode(Parameters.FLASH_MODE_OFF);
          mCamera.setParameters(paramaters);
            mCamera.stopPreview();
          Log.i("info", "Flash is OFF...");
        }
    }
    }
    
    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {}

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
          super.onCreateView(inflater, container, savedInstanceState);
          
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }
    }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {
    // TODO Auto-generated method stub
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    // TODO Auto-generated method stub
      if (mCamera != null && mHolder != null)
      {
      try {
        mCamera.setPreviewDisplay(mHolder);
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub
  }

}

Java Source Code List

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