com.windnow.StationPicActivity.java Source code

Introduction

Here is the source code for com.windnow.StationPicActivity.java

Source

package com.windnow;

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);
    }
}