Android Open Source - AndroidHandsOn Camera Activity

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License

The source code is released under:
Apache License
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Java Source Code

package com.globant.mobile.handson;
// w  w  w.  ja  v a2s .c o  m
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.globant.mobile.handson.exception.CameraNotAvailableException;
import com.globant.mobile.handson.media.CustomCamera;
import com.globant.mobile.handson.util.SystemUiHider;

/**
 * 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 CameraActivity extends BaseActivity {
  /**
   * 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;
  /**
   * Camera preview Object
   */
  private CustomCamera mPreview;
  private Button mDiscardButton;
  private Button mResumeButton;
  private Button mCaptureButton;
  
  

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_camera);
    setupActionBar();

    final LinearLayout controlsView = (LinearLayout)findViewById(R.id.fullscreen_content_controls);
    final FrameLayout contentView = (FrameLayout)findViewById(R.id.camera_preview);
    try{
      mPreview = new CustomCamera(this);
      contentView.addView(mPreview);
    } catch(Exception e){
      Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
    }
    
    mDiscardButton = (Button)findViewById(R.id.button_discard);
    mResumeButton = (Button)findViewById(R.id.button_ok);
    mCaptureButton = (Button)findViewById(R.id.button_capture);

    // 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.button_capture).setOnTouchListener(
        mDelayHideTouchListener);
  }

  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    // Trigger the initial hide() shortly after the activity has been
    // created, to briefly hint to the user that UI controls
    // are available.
    delayedHide(100);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      // TODO: If Settings has multiple levels, Up should navigate up
      // that hierarchy.
      NavUtils.navigateUpFromSameTask(this);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
  @Override
  public void onPause(){
    super.onPause();
    mPreview.releaseCamera();
  }
  
  @Override
  public void onStop(){
    super.onStop();
    mPreview.releaseCamera();
  }
  
  @Override
  public void onDestroy(){
    super.onDestroy();
    mPreview.releaseCamera();
  }
  
  @Override
  public void onRestart(){
    super.onRestart();
    
    try {
      mPreview.initCameraInstance();
    } catch (CameraNotAvailableException e) {      
      e.printStackTrace();
      Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
    }
  }
  
  @Override
  public void onResume(){
    super.onResume();
    
    try {
      mPreview.initCameraInstance();
    } catch (CameraNotAvailableException e) {      
      e.printStackTrace();
      Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
    }
  }
  
  public void takePicture(View view){
    mPreview.takePicture();
    
    mCaptureButton.setVisibility(View.GONE);
    mDiscardButton.setVisibility(View.VISIBLE);
    mResumeButton.setVisibility(View.VISIBLE);    
  }
  
  public void discardPicture(View view){
    mPreview.deleteLastPictureTaken();
    mPreview.resumePreview();
    
    mCaptureButton.setVisibility(View.VISIBLE);
    mDiscardButton.setVisibility(View.GONE);
    mResumeButton.setVisibility(View.GONE);
  }
  
  public void resumePreview(View view){
    mPreview.resumePreview();
    
    mCaptureButton.setVisibility(View.VISIBLE);
    mDiscardButton.setVisibility(View.GONE);
    mResumeButton.setVisibility(View.GONE);
  }
  

  /**
   * 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) {
    mHideHandler.removeCallbacks(mHideRunnable);
    mHideHandler.postDelayed(mHideRunnable, delayMillis);
  }
  
  
}
Java Source Code List
