Android建筑图像过滤器，如Instagram（2）

14。打开FiltersListFragment.java并进行如下所示的修改。这里

> FilterPack.getFilterPack（）提供库中可用过滤器的列表。

>在prepareThumbnail（）方法中，过滤器被填充，并且每个缩略图项目都被添加到ThumbnailsManager以处理它们。处理后的缩略图将添加回thumbnailItemList，后者是RecyclerView的数据资源。

>缩略图数据集准备就绪后，调用mAdapter.notifyDataSetChanged（）来渲染列表。所有这些都是在后台线程中完成的，因为图像处理需要一段时间，我们不应该阻止主线程。

>每当选择新过滤器时，FiltersListFragmentListener接口都会为主活动提供回调方法。

> MainActivity中将对所选图像过滤器的实际处理进行处理。

FiltersListFragment.java

packageinfo.androidhive.imagefilters;

importandroid.graphics.Bitmap;

importandroid.os.Bundle;

importandroid.support.v4.app.Fragment;

importandroid.support.v7.widget.DefaultItemAnimator;

importandroid.support.v7.widget.LinearLayoutManager;

importandroid.support.v7.widget.RecyclerView;

importandroid.util.Log;

importandroid.util.TypedValue;

importandroid.view.LayoutInflater;

importandroid.view.View;

importandroid.view.ViewGroup;

importcom.zomato.photofilters.FilterPack;

importcom.zomato.photofilters.imageprocessors.Filter;

importcom.zomato.photofilters.utils.ThumbnailItem;

importcom.zomato.photofilters.utils.ThumbnailsManager;

importjava.util.ArrayList;

importjava.util.HashMap;

importjava.util.List;

importjava.util.Map;

importbutterknife.BindView;

importbutterknife.ButterKnife;

importinfo.androidhive.imagefilters.utils.BitmapUtils;

importinfo.androidhive.imagefilters.utils.SpacesItemDecoration;

publicclassFiltersListFragment extendsFragment implementsThumbnailsAdapter.ThumbnailsAdapterListener {

@BindView(R.id.recycler_view)

RecyclerView recyclerView;

ThumbnailsAdapter mAdapter;

List thumbnailItemList;

FiltersListFragmentListener listener;

publicvoidsetListener(FiltersListFragmentListener listener) {

this.listener = listener;

}

publicFiltersListFragment() {

// Required empty public constructor

}

@Override

publicvoidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

}

@Override

publicView onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

// Inflate the layout for this fragment

View view = inflater.inflate(R.layout.fragment_filters_list, container, false);

ButterKnife.bind(this, view);

thumbnailItemList = newArrayList<>();

mAdapter = newThumbnailsAdapter(getActivity(), thumbnailItemList, this);

RecyclerView.LayoutManager mLayoutManager = newLinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);

recyclerView.setLayoutManager(mLayoutManager);

recyclerView.setItemAnimator(newDefaultItemAnimator());

intspace = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8,

getResources().getDisplayMetrics());

recyclerView.addItemDecoration(newSpacesItemDecoration(space));

recyclerView.setAdapter(mAdapter);

prepareThumbnail(null);

returnview;

}

/**

* Renders thumbnails in horizontal list

* loads default image from Assets if passed param is null

* @param bitmap

publicvoidprepareThumbnail(finalBitmap bitmap) {

Runnable r = newRunnable() {

publicvoidrun() {

Bitmap thumbImage;

if(bitmap == null) {

thumbImage = BitmapUtils.getBitmapFromAssets(getActivity(), MainActivity.IMAGE_NAME, 100, 100);

} else{

thumbImage = Bitmap.createScaledBitmap(bitmap, 100, 100, false);

}

if(thumbImage == null)

return;

ThumbnailsManager.clearThumbs();

thumbnailItemList.clear();

// add normal bitmap first

ThumbnailItem thumbnailItem = newThumbnailItem();

thumbnailItem.image = thumbImage;

thumbnailItem.filterName = getString(R.string.filter_normal);

ThumbnailsManager.addThumb(thumbnailItem);

List filters = FilterPack.getFilterPack(getActivity());

for(Filter filter : filters) {

ThumbnailItem tI = newThumbnailItem();

tI.image = thumbImage;

tI.filter = filter;

tI.filterName = filter.getName();

ThumbnailsManager.addThumb(tI);

}

thumbnailItemList.addAll(ThumbnailsManager.processThumbs(getActivity()));

getActivity().runOnUiThread(newRunnable() {

@Override

publicvoidrun() {

mAdapter.notifyDataSetChanged();

}

});

}

};

newThread(r).start();

}

@Override

publicvoidonFilterSelected(Filter filter) {

if(listener != null)

listener.onFilterSelected(filter);

}

publicinterfaceFiltersListFragmentListener {

voidonFilterSelected(Filter filter);

}

7.添加图像编辑控件片段

现在我们将添加图像控件片段来控制亮度，对比度和饱和度。

15。按照与上一步相同的步骤再创建一个名为EditImageFragment.java的片段。打开此片段fragment_edit_image.xml的布局文件，并执行如下修改。

在这个布局中，我们将添加三个SeekBar小部件来控制图像亮度，对比度和饱和度。

fragment_edit_image.xml

http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center_vertical"

android:orientation="vertical"

android:paddingLeft="@dimen/margin_horizontal"

android:paddingRight="@dimen/margin_horizontal"

tools:context="info.androidhive.imagefilters.EditImageFragment">

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:paddingBottom="@dimen/padding_10"

android:paddingTop="@dimen/padding_10">

android:layout_width="@dimen/lbl_edit_image_control"

android:layout_height="wrap_content"

android:text="@string/lbl_brightness"/>

android:id="@+id/seekbar_brightness"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"/>

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:paddingBottom="@dimen/padding_10"

android:paddingTop="@dimen/padding_10">

android:layout_width="@dimen/lbl_edit_image_control"

android:layout_height="wrap_content"

android:text="@string/lbl_contrast"/>

android:id="@+id/seekbar_contrast"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"/>

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:paddingBottom="@dimen/padding_10"

android:paddingTop="@dimen/padding_10">

android:layout_width="@dimen/lbl_edit_image_control"

android:layout_height="wrap_content"

android:text="@string/lbl_saturation"/>

android:id="@+id/seekbar_saturation"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"/>

16。打开EditImageFragment.java并进行如下修改。

>在onCreateView方法中，Seekbar小部件使用初始值和最大值进行初始化。对于亮度，值可以在-100 / +100之间。在对比度和饱和度采取浮动值。

>每当Seekbar值发生更改时，EditImageFragmentListener接口都会提供回调方法。

>在回调时，MainActivity再次处理亮度，对比度和饱和度。

EditImageFragment.java

packageinfo.androidhive.imagefilters;

importandroid.os.Bundle;

importandroid.support.v4.app.Fragment;

importandroid.util.Log;

importandroid.view.LayoutInflater;

importandroid.view.View;

importandroid.view.ViewGroup;

importandroid.widget.SeekBar;

importbutterknife.BindView;

importbutterknife.ButterKnife;

publicclassEditImageFragment extendsFragment implementsSeekBar.OnSeekBarChangeListener {

privateEditImageFragmentListener listener;

@BindView(R.id.seekbar_brightness)

SeekBar seekBarBrightness;

@BindView(R.id.seekbar_contrast)

SeekBar seekBarContrast;

@BindView(R.id.seekbar_saturation)

SeekBar seekBarSaturation;

publicvoidsetListener(EditImageFragmentListener listener) {

this.listener = listener;

}

publicEditImageFragment() {

// Required empty public constructor

}

@Override

publicvoidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

}

@Override

publicView onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_edit_image, container, false);

ButterKnife.bind(this, view);

// keeping brightness value b/w -100 / +100

seekBarBrightness.setMax(200);

seekBarBrightness.setProgress(100);

// keeping contrast value b/w 1.0 - 3.0

seekBarContrast.setMax(20);

seekBarContrast.setProgress(0);

// keeping saturation value b/w 0.0 - 3.0

seekBarSaturation.setMax(30);

seekBarSaturation.setProgress(10);

seekBarBrightness.setOnSeekBarChangeListener(this);

seekBarContrast.setOnSeekBarChangeListener(this);

seekBarSaturation.setOnSeekBarChangeListener(this);

returnview;

}

@Override

publicvoidonProgressChanged(SeekBar seekBar, intprogress, booleanb) {

if(listener != null) {

if(seekBar.getId() == R.id.seekbar_brightness) {

// brightness values are b/w -100 to +100

listener.onBrightnessChanged(progress - 100);

}

if(seekBar.getId() == R.id.seekbar_contrast) {

// converting int value to float

// contrast values are b/w 1.0f - 3.0f

// progress = progress > 10 ? progress : 10;

progress += 10;

floatfloatVal = .10f * progress;

listener.onContrastChanged(floatVal);

}

if(seekBar.getId() == R.id.seekbar_saturation) {

// converting int value to float

// saturation values are b/w 0.0f - 3.0f

floatfloatVal = .10f * progress;

listener.onSaturationChanged(floatVal);

}

@Override

publicvoidonStartTrackingTouch(SeekBar seekBar) {

if(listener != null)

listener.onEditStarted();

}

@Override

publicvoidonStopTrackingTouch(SeekBar seekBar) {

if(listener != null)

listener.onEditCompleted();

}

publicvoidresetControls() {

seekBarBrightness.setProgress(100);

seekBarContrast.setProgress(0);

seekBarSaturation.setProgress(10);

}

publicinterfaceEditImageFragmentListener {

voidonBrightnessChanged(intbrightness);

voidonSaturationChanged(floatsaturation);

voidonContrastChanged(floatcontrast);

voidonEditStarted();

voidonEditCompleted();

}

8.实现主界面（组合片段）

现在我们准备好了片段，让我们看看如何将它们组合起来以实现我们的最终输出。

17。打开主活动activity_main.xml和content_main.xml以及NonSwipeableViewPager和TabLayout的布局文件。

activity_main.xml中

http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="info.androidhive.imagefilters.MainActivity">

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:theme="@style/AppTheme.AppBarOverlay">

android:id="@+id/toolbar"

android:layout_width="match_parent"

android:layout_height="?attr/actionBarSize"

android:background="@android:color/white"

app:popupTheme="@style/AppTheme.PopupOverlay"/>

content_main.xml

http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="@android:color/white"

android:orientation="vertical"

app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="info.androidhive.imagefilters.MainActivity"

tools:showIn="@layout/activity_main">

android:id="@+id/image_preview"

android:layout_width="match_parent"

android:layout_height="360dp"

android:scaleType="centerCrop"/>

android:id="@+id/viewpager"

android:layout_width="match_parent"

android:layout_height="120dp"

android:layout_above="@+id/tabs"

android:layout_below="@+id/image_preview"

app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

android:id="@+id/tabs"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

app:tabGravity="fill"

app:tabMode="fixed"/>

18。打开MainActivity.java并执行如下所示的更改。

>调用System.loadLibrary（“NativeImageProcessor”）来初始化本机库。

> FiltersListFragment和EditImageFragments加到ViewPager在setupViewPager（）方法。

> onFilterSelected（）当在被选择的过滤器将被称为FiltersListFragment。处理选定的过滤器，并显示最终图像imagePreview。

> onBrightnessChanged（），onSaturationChanged（）和onContrastChanged（）方法将在EditImageFragments中的Seekbar值更改时调用。

>从工具栏中选择“保存”选项后，最终图像将保存到图库。

MainActivity.java

packageinfo.androidhive.imagefilters;

importandroid.Manifest;

importandroid.content.Intent;

importandroid.graphics.Bitmap;

importandroid.net.Uri;

importandroid.os.Bundle;

importandroid.support.design.widget.CoordinatorLayout;

importandroid.support.design.widget.Snackbar;

importandroid.support.design.widget.TabLayout;

importandroid.support.v4.app.Fragment;

importandroid.support.v4.app.FragmentManager;

importandroid.support.v4.app.FragmentPagerAdapter;

importandroid.support.v4.view.ViewPager;

importandroid.support.v7.app.AppCompatActivity;

importandroid.support.v7.widget.Toolbar;

importandroid.text.TextUtils;

importandroid.util.Log;

importandroid.view.Menu;

importandroid.view.MenuItem;

importandroid.view.View;

importandroid.widget.ImageView;

importandroid.widget.Toast;

importcom.karumi.dexter.Dexter;

importcom.karumi.dexter.MultiplePermissionsReport;

importcom.karumi.dexter.PermissionToken;

importcom.karumi.dexter.listener.PermissionRequest;

importcom.karumi.dexter.listener.multi.MultiplePermissionsListener;

importcom.zomato.photofilters.imageprocessors.Filter;

importcom.zomato.photofilters.imageprocessors.subfilters.BrightnessSubFilter;

importcom.zomato.photofilters.imageprocessors.subfilters.ContrastSubFilter;

importcom.zomato.photofilters.imageprocessors.subfilters.SaturationSubfilter;

importjava.util.ArrayList;

importjava.util.List;

importbutterknife.BindView;

importbutterknife.ButterKnife;

importinfo.androidhive.imagefilters.utils.BitmapUtils;

publicclassMainActivity extendsAppCompatActivity implementsFiltersListFragment.FiltersListFragmentListener, EditImageFragment.EditImageFragmentListener {

privatestaticfinalString TAG = MainActivity.class.getSimpleName();

publicstaticfinalString IMAGE_NAME = "dog.jpg";

publicstaticfinalintSELECT_GALLERY_IMAGE = 101;

@BindView(R.id.image_preview)

ImageView imagePreview;

@BindView(R.id.tabs)

TabLayout tabLayout;

@BindView(R.id.viewpager)

ViewPager viewPager;

@BindView(R.id.coordinator_layout)

CoordinatorLayout coordinatorLayout;

Bitmap originalImage;

// to backup image with filter applied

Bitmap filteredImage;

// the final image after applying

// brightness, saturation, contrast

Bitmap finalImage;

FiltersListFragment filtersListFragment;

EditImageFragment editImageFragment;

// modified image values

intbrightnessFinal = 0;

floatsaturationFinal = 1.0f;

floatcontrastFinal = 1.0f;

// load native image filters library

static{

System.loadLibrary("NativeImageProcessor");

}

@Override

protectedvoidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ButterKnife.bind(this);

Toolbar toolbar = findViewById(R.id.toolbar);

setSupportActionBar(toolbar);

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

getSupportActionBar().setTitle(getString(R.string.activity_title_main));

loadImage();

setupViewPager(viewPager);

tabLayout.setupWithViewPager(viewPager);

}

privatevoidsetupViewPager(ViewPager viewPager) {

ViewPagerAdapter adapter = newViewPagerAdapter(getSupportFragmentManager());

// adding filter list fragment

filtersListFragment = newFiltersListFragment();

filtersListFragment.setListener(this);

// adding edit image fragment

editImageFragment = newEditImageFragment();

editImageFragment.setListener(this);

adapter.addFragment(filtersListFragment, getString(R.string.tab_filters));

adapter.addFragment(editImageFragment, getString(R.string.tab_edit));

viewPager.setAdapter(adapter);

}

@Override

publicvoidonFilterSelected(Filter filter) {

// reset image controls

resetControls();

// applying the selected filter

filteredImage = originalImage.copy(Bitmap.Config.ARGB_8888, true);

// preview filtered image

imagePreview.setImageBitmap(filter.processFilter(filteredImage));

finalImage = filteredImage.copy(Bitmap.Config.ARGB_8888, true);

}

@Override

publicvoidonBrightnessChanged(finalintbrightness) {

brightnessFinal = brightness;

Filter myFilter = newFilter();

myFilter.addSubFilter(newBrightnessSubFilter(brightness));

imagePreview.setImageBitmap(myFilter.processFilter(finalImage.copy(Bitmap.Config.ARGB_8888, true)));

}

@Override

publicvoidonSaturationChanged(finalfloatsaturation) {

saturationFinal = saturation;

Filter myFilter = newFilter();

myFilter.addSubFilter(newSaturationSubfilter(saturation));

imagePreview.setImageBitmap(myFilter.processFilter(finalImage.copy(Bitmap.Config.ARGB_8888, true)));

}

@Override

publicvoidonContrastChanged(finalfloatcontrast) {

contrastFinal = contrast;

Filter myFilter = newFilter();

myFilter.addSubFilter(newContrastSubFilter(contrast));

imagePreview.setImageBitmap(myFilter.processFilter(finalImage.copy(Bitmap.Config.ARGB_8888, true)));

}

@Override

publicvoidonEditStarted() {

}

@Override

publicvoidonEditCompleted() {

// once the editing is done i.e seekbar is drag is completed,

// apply the values on to filtered image

finalBitmap bitmap = filteredImage.copy(Bitmap.Config.ARGB_8888, true);

Filter myFilter = newFilter();

myFilter.addSubFilter(newBrightnessSubFilter(brightnessFinal));

myFilter.addSubFilter(newContrastSubFilter(contrastFinal));

myFilter.addSubFilter(newSaturationSubfilter(saturationFinal));

finalImage = myFilter.processFilter(bitmap);

}

/**

* Resets image edit controls to normal when new filter

* is selected

privatevoidresetControls() {

if(editImageFragment != null) {

editImageFragment.resetControls();

}

brightnessFinal = 0;

saturationFinal = 1.0f;

contrastFinal = 1.0f;

}

classViewPagerAdapter extendsFragmentPagerAdapter {

privatefinalList mFragmentList = newArrayList<>();

privatefinalList mFragmentTitleList = newArrayList<>();

publicViewPagerAdapter(FragmentManager manager) {

super(manager);

}

@Override

publicFragment getItem(intposition) {

returnmFragmentList.get(position);

}

@Override

publicintgetCount() {

returnmFragmentList.size();

}

publicvoidaddFragment(Fragment fragment, String title) {

mFragmentList.add(fragment);

mFragmentTitleList.add(title);

}

@Override

publicCharSequence getPageTitle(intposition) {

returnmFragmentTitleList.get(position);

}

// load the default image from assets on app launch

privatevoidloadImage() {

originalImage = BitmapUtils.getBitmapFromAssets(this, IMAGE_NAME, 300, 300);

filteredImage = originalImage.copy(Bitmap.Config.ARGB_8888, true);

finalImage = originalImage.copy(Bitmap.Config.ARGB_8888, true);

imagePreview.setImageBitmap(originalImage);

}

@Override

publicbooleanonCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.menu_main, menu);

returntrue;

}

@Override

publicbooleanonOptionsItemSelected(MenuItem item) {

intid = item.getItemId();

if(id == R.id.action_open) {

openImageFromGallery();

returntrue;

}

if(id == R.id.action_save) {

saveImageToGallery();

returntrue;

}

returnsuper.onOptionsItemSelected(item);

}

@Override

protectedvoidonActivityResult(intrequestCode, intresultCode, Intent data) {

if(resultCode == RESULT_OK && requestCode == SELECT_GALLERY_IMAGE) {

Bitmap bitmap = BitmapUtils.getBitmapFromGallery(this, data.getData(), 800, 800);

// clear bitmap memory

originalImage.recycle();

finalImage.recycle();

originalImage = bitmap.copy(Bitmap.Config.ARGB_8888, true);

filteredImage = originalImage.copy(Bitmap.Config.ARGB_8888, true);

finalImage = originalImage.copy(Bitmap.Config.ARGB_8888, true);

imagePreview.setImageBitmap(originalImage);

bitmap.recycle();

// render selected image thumbnails

filtersListFragment.prepareThumbnail(originalImage);

}

privatevoidopenImageFromGallery() {

Dexter.withActivity(this).withPermissions(Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE)

.withListener(newMultiplePermissionsListener() {

@Override

publicvoidonPermissionsChecked(MultiplePermissionsReport report) {

if(report.areAllPermissionsGranted()) {

Intent intent = newIntent(Intent.ACTION_PICK);

intent.setType("image/*");

startActivityForResult(intent, SELECT_GALLERY_IMAGE);

} else{

Toast.makeText(getApplicationContext(), "Permissions are not granted!", Toast.LENGTH_SHORT).show();

}

@Override

publicvoidonPermissionRationaleShouldBeShown(List permissions, PermissionToken token) {

token.continuePermissionRequest();

}

}).check();

}

* saves image to camera gallery

* */

privatevoidsaveImageToGallery() {

Dexter.withActivity(this).withPermissions(Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE)

.withListener(newMultiplePermissionsListener() {

@Override

publicvoidonPermissionsChecked(MultiplePermissionsReport report) {

if(report.areAllPermissionsGranted()) {

finalString path = BitmapUtils.insertImage(getContentResolver(), finalImage, System.currentTimeMillis() + "_profile.jpg", null);

if(!TextUtils.isEmpty(path)) {

Snackbar snackbar = Snackbar

.make(coordinatorLayout, "Image saved to gallery!", Snackbar.LENGTH_LONG)

.setAction("OPEN", newView.OnClickListener() {

@Override

publicvoidonClick(View view) {

openImage(path);

}

});

snackbar.show();

} else{

Snackbar snackbar = Snackbar

.make(coordinatorLayout, "Unable to save image!", Snackbar.LENGTH_LONG);

snackbar.show();

}

} else{

Toast.makeText(getApplicationContext(), "Permissions are not granted!", Toast.LENGTH_SHORT).show();

}

@Override

publicvoidonPermissionRationaleShouldBeShown(List permissions, PermissionToken token) {

token.continuePermissionRequest();

}

}).check();

}

// opening image in default image viewer app

privatevoidopenImage(String path) {

Intent intent = newIntent();

intent.setAction(Intent.ACTION_VIEW);

intent.setDataAndType(Uri.parse(path), "image/*");

startActivity(intent);

}

运行应用程序并测试一次。您应该看到文章中显示的漂亮界面。您可以从列表中应用不同的滤镜，并可以控制亮度，饱和度和对比度。

已知的问题

1。当前图像控件更改图像控件时，亮度，对比度和饱和度不平滑。这是由于SeekBar值更改时递归处理/复制位图。改进必须在原生水平上完成。

2。过滤器不像Instagram那么好。在库的下一个版本中，我将尝试即兴创建过滤器。

3。过滤器不适合所有类型的图像。例如：具有白色背景的图像看起来与不同的滤镜几乎相似。

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