Android Open Source - WindNow Station Pic Activity

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From Project

Back to project page WindNow.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.windnow;
/*from w  w  w .j av a2 s. co  m*/
import java.io.FileInputStream;
import java.io.IOException;

import android.support.v4.app.NavUtils;
import android.support.v7.app.ActionBarActivity;
import android.os.Build;
import android.os.Bundle;
import android.view.MenuItem;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * 
 * This Class is part of WindNow.
 * 
 * It is the activity representing pure picture stations.
 * 
 * @author Florian Hauser Copyright (C) 2014
 * 
 *         This program 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.
 * 
 *         This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

public class StationPicActivity extends ActionBarActivity {

  private ImageView imageDetail;
  private Matrix matrix = new Matrix();
  private Matrix savedMatrix = new Matrix();
  private PointF startPoint = new PointF();
  private PointF midPoint = new PointF();
  private float oldDist = 1f;
  static final int NONE = 0;
  static final int DRAG = 1;
  static final int ZOOM = 2;
  int mode = NONE;

  @SuppressLint("NewApi")
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_station_pic);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
      getActionBar().setDisplayHomeAsUpEnabled(true);
    }
    TextView tv = (TextView) findViewById(R.id.textViewPicName);
    tv.setText(getIntent().getExtras().getString("name"));
    imageDetail = (ImageView) findViewById(R.id.imageView1);
    String filename = "pic"
        + getIntent().getExtras().getString("txt").hashCode();
    Bitmap pic = null;
    try {
      FileInputStream is = this.openFileInput(filename);
      pic = BitmapFactory.decodeStream(is);
      is.close();
    } catch (IOException e) {
      LoadSaveOps.printErrorToLog(e);
    }
    imageDetail.setImageBitmap(pic);
    imageDetail.setOnTouchListener(new View.OnTouchListener() {

      @SuppressLint("ClickableViewAccessibility")
      @Override
      public boolean onTouch(View v, MotionEvent event) {

        ImageView view = (ImageView) v;
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:

          savedMatrix.set(matrix);
          startPoint.set(event.getX(), event.getY());
          mode = DRAG;
          break;

        case MotionEvent.ACTION_POINTER_DOWN:

          oldDist = spacing(event);

          if (oldDist > 10f) {
            savedMatrix.set(matrix);
            midPoint(midPoint, event);
            mode = ZOOM;
          }
          break;

        case MotionEvent.ACTION_UP:

        case MotionEvent.ACTION_POINTER_UP:
          mode = NONE;

          break;

        case MotionEvent.ACTION_MOVE:
          if (mode == DRAG) {
            matrix.set(savedMatrix);
            matrix.postTranslate(event.getX() - startPoint.x,
                event.getY() - startPoint.y);
          } else if (mode == ZOOM) {
            float newDist = spacing(event);
            if (newDist > 10f) {
              matrix.set(savedMatrix);
              float scale = newDist / oldDist;
              matrix.postScale(scale, scale, midPoint.x,
                  midPoint.y);
              matrix.postTranslate(event.getX() - startPoint.x,
                  event.getY() - startPoint.y); //new
            }
          }
          break;

        }
        view.setImageMatrix(matrix);

        return true;
      }

      @SuppressLint("FloatMath")
      private float spacing(MotionEvent event) {
        float x = event.getX(0) - event.getX(1);
        float y = event.getY(0) - event.getY(1);
        return FloatMath.sqrt(x * x + y * y);
      }

      private void midPoint(PointF point, MotionEvent event) {
        float x = event.getX(0) + event.getX(1);
        float y = event.getY(0) + event.getY(1);
        point.set(x / 2, y / 2);
      }
    });

  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      Intent intent = new Intent(this, MainActivity.class);
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // Resume saved
                                // State!
      NavUtils.navigateUpTo(this, intent);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
}

Java Source Code List

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