Java tutorial
/* * Copyright (C) 2012 The Android Open Source Project * * 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.ville.homeland.ui; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; import android.annotation.TargetApi; import android.graphics.Bitmap; import android.graphics.Bitmap.CompressFormat; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.DisplayMetrics; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.Toast; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; import com.actionbarsherlock.view.Window; import com.example.android.bitmapfun.util.ImageCache; import com.example.android.bitmapfun.util.ImageFetcher; import com.polites.android.GestureImageView; import com.ville.homeland.HomeLandApplication; import com.ville.homeland.R; import com.ville.homeland.bean.ImageInfo; import com.ville.homeland.util.FileUtils; import com.ville.homeland.view.GifImageDetailFragment; import com.ville.homeland.view.ImageDetailFragment; public class ImageDetailActivity extends SherlockFragmentActivity implements OnClickListener, OnPageChangeListener { private static final String IMAGE_CACHE_DIR = "images"; public static final String EXTRA_IMAGE_INDEX = "extra_image_index"; public static final String EXTRA_IMAGE_URLS = "extra_image_urls"; private ImagePagerAdapter mAdapter; private ImageFetcher mImageFetcher; private ViewPager mPager; @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY); setContentView(R.layout.activity_image_detail_pager); // Fetch screen height and width, to use as our max size when loading images as this // activity runs full screen final DisplayMetrics displayMetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); final int height = displayMetrics.heightPixels; final int width = displayMetrics.widthPixels; // For this sample we'll use half of the longest width to resize our images. As the // image scaling ensures the image is larger than this, we should be left with a // resolution that is appropriate for both portrait and landscape. For best image quality // we shouldn't divide by 2, but this will use more memory and require a larger memory // cache. final int longest = (height > width ? height : width) / 2; ImageCache.ImageCacheParams cacheParams = new ImageCache.ImageCacheParams(this, IMAGE_CACHE_DIR); cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory // The ImageFetcher takes care of loading images into our ImageView children asynchronously mImageFetcher = new ImageFetcher(this, longest); mImageFetcher.addImageCache(getSupportFragmentManager(), cacheParams); mImageFetcher.setImageFadeIn(false); // Set up ViewPager and backing adapter mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), getIntent().getStringArrayListExtra(EXTRA_IMAGE_URLS)); mPager = (ViewPager) findViewById(R.id.pager); mPager.setAdapter(mAdapter); mPager.setPageMargin((int) getResources().getDimension(R.dimen.image_detail_pager_margin)); mPager.setOffscreenPageLimit(2); mPager.setOnPageChangeListener(this); final ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setBackgroundDrawable(getResources().getDrawable(R.drawable.actionbar_gray_bg)); // Set the current item based on the extra passed in to this activity final int extraCurrentItem = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0); mPager.setCurrentItem(extraCurrentItem); } @Override public void onResume() { super.onResume(); mImageFetcher.setExitTasksEarly(false); } @Override protected void onPause() { super.onPause(); mImageFetcher.setExitTasksEarly(true); mImageFetcher.flushCache(); } @Override protected void onDestroy() { super.onDestroy(); mImageFetcher.closeCache(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub getSupportMenuInflater().inflate(R.menu.main_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case android.R.id.home: ImageDetailActivity.this.finish(); return true; case R.id.save: doSaveImage(); return true; } return super.onOptionsItemSelected(item); } private void doSaveImage() { // TODO Auto-generated method stub String url = mAdapter.getImageUrl(mPager.getCurrentItem()); //this is not the real name, normal format is like xxxxxx.0 String fileName = ImageCache.hashKeyForDisk(url) + ".jpg"; System.out.println(fileName); int curr = mPager.getCurrentItem(); System.out.println("Page: CurrentItem = " + curr); // ViewGroup childA = (ViewGroup) mPager.getChildAt(curr); ViewGroup childA = (ViewGroup) mPager.findViewWithTag(mAdapter.getImageUrl(curr)); View image = null; if (childA == null) { System.out.println("ChildA is NULL!!"); } else { ViewGroup child = (ViewGroup) childA.getChildAt(0); image = child.findViewById(R.id.imageView); } Bitmap bmp = null; if (image instanceof GestureImageView) { bmp = ((BitmapDrawable) ((GestureImageView) image).getDrawable()).getBitmap(); } else if (image instanceof ImageView) { bmp = ((BitmapDrawable) ((ImageView) image).getDrawable()).getBitmap(); } boolean status = false; if (bmp == null) { Toast.makeText(this, "???", Toast.LENGTH_SHORT).show(); } else { String dirName = "HomeLand"; if (!FileUtils.checkFileExists(dirName) || !FileUtils.checkIsDirectory(dirName)) { // System.out.println("BBBBB Creaate"); FileUtils.createDirectory(dirName); } String filePath = Environment.getExternalStorageDirectory() + File.separator + dirName + File.separator + fileName; File outFile = new File(filePath); if (!outFile.exists()) { try { FileOutputStream os = new FileOutputStream(outFile); bmp.compress(CompressFormat.JPEG, 100, os); os.close(); status = true; } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); status = false; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); status = false; } } else { Toast.makeText(this, "???", Toast.LENGTH_SHORT).show(); } if (status) { Toast.makeText(this, "??" + filePath, Toast.LENGTH_LONG).show(); } } } /** * Called by the ViewPager child fragments to load images via the one ImageFetcher */ public ImageFetcher getImageFetcher() { return mImageFetcher; } /** * The main adapter that backs the ViewPager. A subclass of FragmentStatePagerAdapter as there * could be a large number of items in the ViewPager and we don't want to retain them all in * memory at once but create/destroy them on the fly. */ private class ImagePagerAdapter extends FragmentStatePagerAdapter { // private final int mSize; private List<String> mUrls; public ImagePagerAdapter(FragmentManager fm, List<String> list) { super(fm); if (list == null) { System.out.println("ImagePagerAdapter list is null"); list = new LinkedList<String>(); } mUrls = list; } @Override public int getCount() { return mUrls.size(); } public String getImageUrl(int position) { return mUrls.get(position); } @Override public Fragment getItem(int position) { String url = mUrls.get(position); if (url.toLowerCase().endsWith(".gif")) { return GifImageDetailFragment.newInstance(url); } return ImageDetailFragment.newInstance(url); } } /** * Set on the ImageView in the ViewPager children fragments, to enable/disable low profile mode * when the ImageView is touched. */ @TargetApi(11) @Override public void onClick(View v) { ActionBar actionBar = getSupportActionBar(); final boolean vis = actionBar.isShowing(); if (vis) { actionBar.hide(); } else { actionBar.show(); } } @Override public void onPageScrollStateChanged(int state) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { // TODO Auto-generated method stub } @Override public void onPageSelected(int arg0) { // TODO Auto-generated method stub String title = (mPager.getCurrentItem() + 1) + "/" + mAdapter.getCount(); System.out.println("Page: Selected=" + title); getSupportActionBar().setTitle(title); } }