Java tutorial
package com.luorrak.ouroboros.thread; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Bundle; import android.support.design.widget.Snackbar; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.support.v7.widget.helper.ItemTouchHelper; import android.util.AttributeSet; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ProgressBar; import com.koushikdutta.ion.Ion; import com.luorrak.ouroboros.R; import com.luorrak.ouroboros.catalog.CatalogActivity; import com.luorrak.ouroboros.catalog.WatchListAdapter; import com.luorrak.ouroboros.util.DragAndDropRecyclerView.WatchListTouchHelper; import com.luorrak.ouroboros.util.InfiniteDbHelper; import com.luorrak.ouroboros.util.SettingsHelper; import com.luorrak.ouroboros.util.Util; /** * Ouroboros - An 8chan browser * Copyright (C) 2015 Luorrak * * 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 ThreadActivity extends AppCompatActivity { private Toolbar toolbar; private InfiniteDbHelper infiniteDbHelper; private DrawerLayout drawerLayout; private RecyclerView watchList; private WatchListAdapter watchListAdapter; private ThreadFragment threadFragment; private int threadDepth; @Override protected void onCreate(Bundle savedInstanceState) { Util.onActivityCreateSetTheme(this, SettingsHelper.getTheme(this)); super.onCreate(savedInstanceState); setContentView(R.layout.activity_thread); Ion.getDefault(getApplicationContext()).getCache().setMaxSize(150 * 1024 * 1024); infiniteDbHelper = new InfiniteDbHelper(getApplicationContext()); toolbar = (Toolbar) findViewById(R.id.app_bar); setSupportActionBar(toolbar); getSupportActionBar().setHomeButtonEnabled(true); getSupportActionBar().setDisplayHomeAsUpEnabled(true); String resto = getIntent().getStringExtra(Util.INTENT_THREAD_NO); String boardName = getIntent().getStringExtra(Util.INTENT_BOARD_NAME); int threadPosition = getIntent().getIntExtra(Util.INTENT_THREAD_POSITION, 0); boolean threadVisible = false; if (savedInstanceState != null) { threadDepth = savedInstanceState.getInt("threadDepth"); int backstackCount = getFragmentManager().getBackStackEntryCount(); if (backstackCount > 0) { if (getFragmentManager().getBackStackEntryAt(backstackCount - 1).getName() .equals("threadDepth" + String.valueOf(threadDepth))) { threadVisible = true; } } threadFragment = (ThreadFragment) getFragmentManager().getFragment(savedInstanceState, "threadDepth" + String.valueOf(threadDepth)); } else { threadDepth = 0; threadFragment = new ThreadFragment().newInstance(resto, boardName, threadPosition); threadVisible = true; } if (threadVisible) { FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); fragmentTransaction .replace(R.id.placeholder_card, threadFragment, "threadDepth" + String.valueOf(threadDepth)) .commit(); } //Watchlist Layout drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); watchList = (RecyclerView) findViewById(R.id.watch_list); final LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext()); watchList.setLayoutManager(layoutManager); watchListAdapter = new WatchListAdapter(infiniteDbHelper.getWatchlistCursor(), drawerLayout, infiniteDbHelper); watchList.setAdapter(watchListAdapter); ItemTouchHelper.Callback callback = new WatchListTouchHelper(watchListAdapter); ItemTouchHelper touchHelper = new ItemTouchHelper(callback); touchHelper.attachToRecyclerView(watchList); } @Override public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { return super.onCreateView(parent, name, context, attrs); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_thread, menu); return true; } // Life cycle ////////////////////////////////////////////////////////////////////////////////// @Override public void onDestroy() { if (!isChangingConfigurations()) { infiniteDbHelper.deleteThreadCache(); } super.onDestroy(); } @Override protected void onResume() { super.onResume(); if (watchListAdapter != null) { watchListAdapter.changeCursor(infiniteDbHelper.getWatchlistCursor()); } } @Override protected void onSaveInstanceState(Bundle outState) { outState.putInt("threadDepth", threadDepth); getFragmentManager().putFragment(outState, "threadDepth" + String.valueOf(threadDepth), threadFragment); super.onSaveInstanceState(outState); } // Callbacks /////////////////////////////////////////////////////////////////////////////////// @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == android.R.id.home) { this.onBackPressed(); return true; } return super.onOptionsItemSelected(item); } @Override public void onBackPressed() { if (getFragmentManager().getBackStackEntryCount() > 0) { String fragmentTag = getFragmentManager() .getBackStackEntryAt(getFragmentManager().getBackStackEntryCount() - 1).getName(); if (fragmentTag.equals("threadDepth" + String.valueOf(threadDepth))) { threadDepth = threadDepth - 1; threadFragment = (ThreadFragment) getFragmentManager() .findFragmentByTag("threadDepth" + String.valueOf(threadDepth)); } getFragmentManager().popBackStack(); } else { this.finish(); } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case Util.REQUEST_STORAGE_PERMISSION: { //https://stackoverflow.com/questions/35124794/android-studio-remove-security-exception-warning // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // permission was granted, yay! Do the task you need to do. } else { // permission denied, boo! Disable the // functionality that depends on this permission. Snackbar.make(getCurrentFocus(), "Requires Permission", Snackbar.LENGTH_LONG).show(); } break; } // other 'case' lines to check for other // permissions this app might request } } public void doPositiveClickExternal(String url) { Intent i = new Intent(Intent.ACTION_VIEW); i.setData(Uri.parse(url)); startActivity(i); } public void doPositiveClickInternal(String threadNo, String boardName) { FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); //clear dialog fragments fragmentManager.popBackStack("threadDialog", FragmentManager.POP_BACK_STACK_INCLUSIVE); if (!threadNo.equals("0")) { threadDepth = threadDepth + 1; threadFragment = new ThreadFragment().newInstance(threadNo, boardName); fragmentTransaction.replace(R.id.placeholder_card, threadFragment) .addToBackStack("threadDepth" + String.valueOf(threadDepth)).commit(); } else { Intent intent = new Intent(this, CatalogActivity.class); intent.putExtra(Util.INTENT_BOARD_NAME, boardName); startActivity(intent); } } public void setProgressBarStatus(boolean status) { ProgressBar progressBar = (ProgressBar) findViewById(R.id.progress_bar); if (status) { progressBar.setVisibility(View.VISIBLE); } else { progressBar.setVisibility(View.INVISIBLE); } } public void doNegativeClick() { } public void updateWatchlist() { watchListAdapter.changeCursor(infiniteDbHelper.getWatchlistCursor()); } }