Android Open Source - GradleAndroid-App Capture Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*from  w ww.j  av  a  2 s.  c  o m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.app.function.qrcode.activity;

import java.io.IOException;
import java.lang.reflect.Field;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.RelativeLayout;

import com.android.app.function.R;
import com.android.app.function.qrcode.camera.CameraManager;
import com.android.app.function.qrcode.decode.DecodeThread;
import com.android.app.function.qrcode.utils.BeepManager;
import com.android.app.function.qrcode.utils.CaptureActivityHandler;
import com.android.app.function.qrcode.utils.InactivityTimer;
import com.google.zxing.Result;

/**
 * This activity opens the camera and does the actual scanning on a background
 * thread. It draws a viewfinder to help the user place the barcode correctly,
 * shows feedback as the image processing is happening, and then overlays the
 * results when a scan is successful.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity extends Activity implements SurfaceHolder.Callback {

  private static final String TAG = CaptureActivity.class.getSimpleName();

  private CameraManager cameraManager;
  private CaptureActivityHandler handler;
  private InactivityTimer inactivityTimer;
  private BeepManager beepManager;

  private SurfaceView scanPreview = null;
  private RelativeLayout scanContainer;
  private RelativeLayout scanCropView;
  private ImageView scanLine;

  private Rect mCropRect = null;

  public Handler getHandler() {
    return handler;
  }

  public CameraManager getCameraManager() {
    return cameraManager;
  }

  private boolean isHasSurface = false;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.qr_activity_capture);

    scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
    scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
    scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
    scanLine = (ImageView) findViewById(R.id.capture_scan_line);

    inactivityTimer = new InactivityTimer(this);
    beepManager = new BeepManager(this);

    TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,
        0.9f);
    animation.setDuration(4500);
    animation.setRepeatCount(-1);
    animation.setRepeatMode(Animation.RESTART);
    scanLine.startAnimation(animation);
  }

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

    // CameraManager must be initialized here, not in onCreate(). This is
    // necessary because we don't
    // want to open the camera driver and measure the screen size if we're
    // going to show the help on
    // first launch. That led to bugs where the scanning rectangle was the
    // wrong size and partially
    // off screen.
    cameraManager = new CameraManager(getApplication());

    handler = null;

    if (isHasSurface) {
      // The activity was paused but not stopped, so the surface still
      // exists. Therefore
      // surfaceCreated() won't be called, so init the camera here.
      initCamera(scanPreview.getHolder());
    } else {
      // Install the callback and wait for surfaceCreated() to init the
      // camera.
      scanPreview.getHolder().addCallback(this);
    }

    inactivityTimer.onResume();
  }

  @Override
  protected void onPause() {
    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }
    inactivityTimer.onPause();
    beepManager.close();
    cameraManager.closeDriver();
    if (!isHasSurface) {
      scanPreview.getHolder().removeCallback(this);
    }
    super.onPause();
  }

  @Override
  protected void onDestroy() {
    inactivityTimer.shutdown();
    super.onDestroy();
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (holder == null) {
      Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");
    }
    if (!isHasSurface) {
      isHasSurface = true;
      initCamera(holder);
    }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    isHasSurface = false;
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

  }

  /**
   * A valid barcode has been found, so give an indication of success and show
   * the results.
   * 
   * @param rawResult
   *            The contents of the barcode.
   * 
   * @param bundle
   *            The extras
   */
  public void handleDecode(Result rawResult, Bundle bundle) {
    inactivityTimer.onActivity();
    beepManager.playBeepSoundAndVibrate();

    bundle.putInt("width", mCropRect.width());
    bundle.putInt("height", mCropRect.height());
    bundle.putString("result", rawResult.getText());

    startActivity(new Intent(CaptureActivity.this, ResultActivity.class).putExtras(bundle));
  }

  private void initCamera(SurfaceHolder surfaceHolder) {
    if (surfaceHolder == null) {
      throw new IllegalStateException("No SurfaceHolder provided");
    }
    if (cameraManager.isOpen()) {
      Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?");
      return;
    }
    try {
      cameraManager.openDriver(surfaceHolder);
      // Creating the handler starts the preview, which can also throw a
      // RuntimeException.
      if (handler == null) {
        handler = new CaptureActivityHandler(this, cameraManager, DecodeThread.ALL_MODE);
      }

      initCrop();
    } catch (IOException ioe) {
      Log.w(TAG, ioe);
      displayFrameworkBugMessageAndExit();
    } catch (RuntimeException e) {
      // Barcode Scanner has seen crashes in the wild of this variety:
      // java.?lang.?RuntimeException: Fail to connect to camera service
      Log.w(TAG, "Unexpected error initializing camera", e);
      displayFrameworkBugMessageAndExit();
    }
  }

  private void displayFrameworkBugMessageAndExit() {
    // camera error
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(getString(R.string.qr_code));
    builder.setMessage("????????????????");
    builder.setPositiveButton("??", new DialogInterface.OnClickListener() {

      @Override
      public void onClick(DialogInterface dialog, int which) {
        finish();
      }

    });
    builder.setOnCancelListener(new DialogInterface.OnCancelListener() {

      @Override
      public void onCancel(DialogInterface dialog) {
        finish();
      }
    });
    builder.show();
  }

  public void restartPreviewAfterDelay(long delayMS) {
    if (handler != null) {
      handler.sendEmptyMessageDelayed(R.id.qr_restart_preview, delayMS);
    }
  }

  public Rect getCropRect() {
    return mCropRect;
  }

  /**
   * ?????????????
   */
  private void initCrop() {
    int cameraWidth = cameraManager.getCameraResolution().y;
    int cameraHeight = cameraManager.getCameraResolution().x;

    /** ???????????????????? */
    int[] location = new int[2];
    scanCropView.getLocationInWindow(location);

    int cropLeft = location[0];
    int cropTop = location[1] - getStatusBarHeight();

    int cropWidth = scanCropView.getWidth();
    int cropHeight = scanCropView.getHeight();

    /** ??????????? */
    int containerWidth = scanContainer.getWidth();
    int containerHeight = scanContainer.getHeight();

    /** ?????????????????x???? */
    int x = cropLeft * cameraWidth / containerWidth;
    /** ?????????????????y???? */
    int y = cropTop * cameraHeight / containerHeight;

    /** ?????????????? */
    int width = cropWidth * cameraWidth / containerWidth;
    /** ?????????????? */
    int height = cropHeight * cameraHeight / containerHeight;

    /** ????????????? */
    mCropRect = new Rect(x, y, width + x, height + y);
  }

  private int getStatusBarHeight() {
    try {
      Class<?> c = Class.forName("com.android.internal.R$dimen");
      Object obj = c.newInstance();
      Field field = c.getField("status_bar_height");
      int x = Integer.parseInt(field.get(obj).toString());
      return getResources().getDimensionPixelSize(x);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return 0;
  }
}

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