Java tutorial
/* Copyright 2017 Andrew Dawson * * This file is a part of Tusky. * * 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. * * Tusky 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 Tusky; if not, * see <http://www.gnu.org/licenses>. */ package com.keylesspalace.tusky; import android.Manifest; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.app.DownloadManager; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Color; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.annotation.StringRes; import android.support.design.widget.Snackbar; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.ActionBar; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.View; import android.widget.Toast; import com.keylesspalace.tusky.entity.Attachment; import com.keylesspalace.tusky.fragment.ViewMediaFragment; import com.keylesspalace.tusky.pager.AvatarImagePagerAdapter; import com.keylesspalace.tusky.pager.ImagePagerAdapter; import com.keylesspalace.tusky.view.ImageViewPager; import com.keylesspalace.tusky.viewdata.AttachmentViewData; import java.io.File; import java.util.ArrayList; import java.util.List; import kotlin.collections.CollectionsKt; import kotlin.jvm.functions.Function0; public final class ViewMediaActivity extends BaseActivity implements ViewMediaFragment.PhotoActionsListener { private static final String EXTRA_ATTACHMENTS = "attachments"; private static final String EXTRA_ATTACHMENT_INDEX = "index"; private static final String EXTRA_AVATAR_URL = "avatar"; public static Intent newIntent(Context context, List<AttachmentViewData> attachments, int index) { final Intent intent = new Intent(context, ViewMediaActivity.class); intent.putParcelableArrayListExtra(EXTRA_ATTACHMENTS, new ArrayList<>(attachments)); intent.putExtra(EXTRA_ATTACHMENT_INDEX, index); return intent; } public static Intent newAvatarIntent(Context context, String url) { final Intent intent = new Intent(context, ViewMediaActivity.class); intent.putExtra(EXTRA_AVATAR_URL, url); return intent; } private static final int PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 1; private ImageViewPager viewPager; private View anyView; private Toolbar toolbar; private List<AttachmentViewData> attachments; private boolean isToolbarVisible = true; private final List<ToolbarVisibilityListener> toolbarVisibilityListeners = new ArrayList<>(); public interface ToolbarVisibilityListener { void onToolbarVisiblityChanged(boolean isVisible); } public Function0 addToolbarVisibilityListener(ToolbarVisibilityListener listener) { this.toolbarVisibilityListeners.add(listener); listener.onToolbarVisiblityChanged(isToolbarVisible); return () -> toolbarVisibilityListeners.remove(listener); } public boolean isToolbarVisible() { return isToolbarVisible; } @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_media); supportPostponeEnterTransition(); // Obtain the views. toolbar = findViewById(R.id.toolbar); viewPager = findViewById(R.id.view_pager); anyView = toolbar; // Gather the parameters. Intent intent = getIntent(); attachments = intent.getParcelableArrayListExtra(EXTRA_ATTACHMENTS); int initialPosition = intent.getIntExtra(EXTRA_ATTACHMENT_INDEX, 0); final PagerAdapter adapter; if (attachments != null) { List<Attachment> realAttachs = CollectionsKt.map(attachments, AttachmentViewData::getAttachment); // Setup the view pager. adapter = new ImagePagerAdapter(getSupportFragmentManager(), realAttachs, initialPosition); } else { String avatarUrl = intent.getStringExtra(EXTRA_AVATAR_URL); if (avatarUrl == null) { throw new IllegalArgumentException("attachment list or avatar url has to be set"); } adapter = new AvatarImagePagerAdapter(getSupportFragmentManager(), avatarUrl); } viewPager.setAdapter(adapter); viewPager.setCurrentItem(initialPosition); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { CharSequence title = adapter.getPageTitle(position); toolbar.setTitle(title); } @Override public void onPageScrollStateChanged(int state) { } }); // Setup the toolbar. setSupportActionBar(toolbar); ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setDisplayShowHomeEnabled(true); actionBar.setTitle(adapter.getPageTitle(initialPosition)); } toolbar.setNavigationOnClickListener(v -> supportFinishAfterTransition()); toolbar.setOnMenuItemClickListener(item -> { int id = item.getItemId(); switch (id) { case R.id.action_download: downloadImage(); break; case R.id.action_open_status: onOpenStatus(); break; } return true; }); View decorView = getWindow().getDecorView(); int uiOptions = View.SYSTEM_UI_FLAG_LOW_PROFILE; decorView.setSystemUiVisibility(uiOptions); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { getWindow().setStatusBarColor(Color.BLACK); } } @Override public boolean onCreateOptionsMenu(Menu menu) { if (attachments != null) { getMenuInflater().inflate(R.menu.view_media_toolbar, menu); return true; } else { return false; } } @Override public void onBringUp() { supportStartPostponedEnterTransition(); } @Override public void onDismiss() { supportFinishAfterTransition(); } @Override public void onPhotoTap() { isToolbarVisible = !isToolbarVisible; for (ToolbarVisibilityListener listener : toolbarVisibilityListeners) { listener.onToolbarVisiblityChanged(isToolbarVisible); } final int visibility = isToolbarVisible ? View.VISIBLE : View.INVISIBLE; int alpha = isToolbarVisible ? 1 : 0; toolbar.animate().alpha(alpha).setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { toolbar.setVisibility(visibility); animation.removeListener(this); } }).start(); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) { switch (requestCode) { case PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE: { if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { downloadImage(); } else { doErrorDialog(R.string.error_media_download_permission, R.string.action_retry, v -> downloadImage()); } break; } } } private void doErrorDialog(@StringRes int descriptionId, @StringRes int actionId, View.OnClickListener listener) { if (anyView != null) { Snackbar bar = Snackbar.make(anyView, getString(descriptionId), Snackbar.LENGTH_SHORT); bar.setAction(actionId, listener); bar.show(); } } private void downloadImage() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE); } else { String url = attachments.get(viewPager.getCurrentItem()).getAttachment().getUrl(); Uri uri = Uri.parse(url); String filename = new File(url).getName(); String toastText = String.format(getResources().getString(R.string.download_image), filename); Toast.makeText(this.getApplicationContext(), toastText, Toast.LENGTH_SHORT).show(); DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE); DownloadManager.Request request = new DownloadManager.Request(uri); request.allowScanningByMediaScanner(); request.setDestinationInExternalPublicDir(Environment.DIRECTORY_PICTURES, getString(R.string.app_name) + "/" + filename); downloadManager.enqueue(request); } } private void onOpenStatus() { final AttachmentViewData attach = attachments.get(viewPager.getCurrentItem()); startActivityWithSlideInAnimation( ViewThreadActivity.startIntent(this, attach.getStatusId(), attach.getStatusUrl())); } }