Java tutorial
/* * Copyright 2011 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 dev.ronlemire.validation; import dev.ronlemire.validation.R; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.res.Configuration; import android.graphics.Color; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.util.DisplayMetrics; import android.view.Display; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.TextView; public class MainActivity extends ActionBarFragmentActivity { public static final String TAG = "MainActivity"; private FragmentManager fm = getSupportFragmentManager(); private Fragment validationListFragment; private String validationSelected; public static View validationListView; private TextView messageTextView; private ValidationListReceiver validationListReceiver; private IntentFilter validationListFilter; private MessageFromHintsReceiver messageFromHintsReceiver; private MessageFromInputTypeReceiver messageFromInputTypeReceiver; private MessageFromRegexReceiver messageFromRegexReceiver; private IntentFilter messageFromHintsFilter; private IntentFilter messageFromInputTypeFilter; private IntentFilter messageFromRegexFilter; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Test whether if enough display space for 2 panes. Only if tablet and // landscape. if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE && isTablet()) { // 2 panes - list on left - sample on right setContentView(R.layout.main_land); StartEmptyFragment(); // clear sample pane } else { // 1 pane - list and sample will overlay each other setContentView(R.layout.main); } // Save reference to List in order to replace later validationListView = this.findViewById(R.id.list_replacer); messageTextView = (TextView) this.findViewById(R.id.etMessages); messageTextView.setEnabled(false); messageTextView.setTextColor(Color.parseColor("#000000")); // black // Receiver to catch message sent from List after a sample has been // picked validationListReceiver = new ValidationListReceiver(); validationListFilter = new IntentFilter(ValidationListFragment.VALIDATION_LIST_FRAGMENT_BROADCAST_INTENT); // Messages from controls messageFromHintsReceiver = new MessageFromHintsReceiver(); messageFromHintsFilter = new IntentFilter(HintsFragment.MESSAGE_FROM_HINTS_INTENT); messageFromInputTypeReceiver = new MessageFromInputTypeReceiver(); messageFromInputTypeFilter = new IntentFilter(InputTypeFragment.MESSAGE_FROM_INPUT_TYPE_INTENT); messageFromRegexReceiver = new MessageFromRegexReceiver(); messageFromRegexFilter = new IntentFilter(RegexFragment.MESSAGE_FROM_REGEX_INTENT); if (savedInstanceState == null) { StartValidationListFragment(); } else { messageTextView.setText(savedInstanceState.getString("message")); } } @Override protected void onSaveInstanceState(Bundle outState) { outState.putString("message", messageTextView.getText().toString()); super.onSaveInstanceState(outState); } @Override public void onResume() { super.onResume(); registerReceiver(validationListReceiver, validationListFilter); registerReceiver(messageFromHintsReceiver, messageFromHintsFilter); registerReceiver(messageFromInputTypeReceiver, messageFromInputTypeFilter); registerReceiver(messageFromRegexReceiver, messageFromRegexFilter); } @Override protected void onPause() { super.onPause(); unregisterReceiver(validationListReceiver); unregisterReceiver(messageFromHintsReceiver); unregisterReceiver(messageFromInputTypeReceiver); unregisterReceiver(messageFromRegexReceiver); } @Override public void onBackPressed() { ClearMessageBox(); super.onBackPressed(); } // ***************************************************************************** // BroadcastReceivers // ***************************************************************************** class ValidationListReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { // Sample selected from list will be in Intent's extra data validationSelected = intent.getStringExtra(ValidationListFragment.VALIDATION_SELECTED); // Start sample fragment depending on which sample was selected ClearMessageBox(); PopFragmentBackStack(); if (validationSelected.equals("HintsFragment")) { StartHintsFragment(); } else if (validationSelected.equals("InputTypeFragment")) { StartInputTypeFragment(); } else if (validationSelected.equals("RegexFragment")) { StartRegexFragment(); } } } class MessageFromHintsReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String message = (String) intent.getSerializableExtra(HintsFragment.OUT_MESSAGE_KEY); messageTextView.setText(message); } } class MessageFromInputTypeReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String message = (String) intent.getSerializableExtra(InputTypeFragment.OUT_MESSAGE_KEY); messageTextView.setText(message); } } class MessageFromRegexReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String message = (String) intent.getSerializableExtra(RegexFragment.OUT_MESSAGE_KEY); messageTextView.setText(message); } } // ***************************************************************************** // Start Fragments // ***************************************************************************** public void StartValidationListFragment() { validationListFragment = (Fragment) getSupportFragmentManager().findFragmentById(R.id.list_replacer); validationListFragment = ValidationListFragment.newInstance("inMessageGoesHere"); FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.list_replacer, validationListFragment); fragmentTransaction.commit(); } public void StartEmptyFragment() { Fragment validationEmptyFragment = (Fragment) fm.findFragmentById(R.id.detail_replacer); validationEmptyFragment = EmptyFragment.newInstance(); fm.beginTransaction().replace(R.id.detail_replacer, validationEmptyFragment).commit(); } public void StartHintsFragment() { if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE && isTablet()) { Fragment hintsFragment = (Fragment) fm.findFragmentById(R.id.detail_replacer); hintsFragment = HintsFragment.newInstance("Hints"); FragmentTransaction transaction = fm.beginTransaction().replace(R.id.detail_replacer, hintsFragment); transaction.addToBackStack(null); transaction.commit(); } else { HintsFragment hintsFragment = HintsFragment.newInstance("Hints"); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction() .replace(MainActivity.validationListView.getId(), hintsFragment); transaction.addToBackStack(null); transaction.commit(); } } public void StartInputTypeFragment() { if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE && isTablet()) { Fragment inputTypeFragment = (Fragment) fm.findFragmentById(R.id.detail_replacer); inputTypeFragment = InputTypeFragment.newInstance("InputType"); FragmentTransaction transaction = fm.beginTransaction().replace(R.id.detail_replacer, inputTypeFragment); transaction.addToBackStack(null); transaction.commit(); } else { InputTypeFragment inputTypeFragment = InputTypeFragment.newInstance("InputType"); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction() .replace(MainActivity.validationListView.getId(), inputTypeFragment); transaction.addToBackStack(null); transaction.commit(); } } public void StartRegexFragment() { if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE && isTablet()) { Fragment regexFragment = (Fragment) fm.findFragmentById(R.id.detail_replacer); regexFragment = RegexFragment.newInstance("Regex"); FragmentTransaction transaction = fm.beginTransaction().replace(R.id.detail_replacer, regexFragment); transaction.addToBackStack(null); transaction.commit(); } else { RegexFragment regexFragment = RegexFragment.newInstance("Regex"); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction() .replace(MainActivity.validationListView.getId(), regexFragment); transaction.addToBackStack(null); transaction.commit(); } } // ***************************************************************************** // Action Bar // ***************************************************************************** @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.main, menu); // Calling super after populating the menu is necessary here to ensure // that the action bar helpers have a chance to handle this event. return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // Toast.makeText(this, "Tapped home", Toast.LENGTH_SHORT).show(); ReturnToValidationList(); break; case R.id.menu_refresh: // Toast.makeText(this, "Fake refreshing...", // Toast.LENGTH_SHORT).show(); ReturnToValidationList(); break; } return super.onOptionsItemSelected(item); } // ***************************************************************************** // Helper methods // ***************************************************************************** private boolean isTablet() { Display display = getWindowManager().getDefaultDisplay(); DisplayMetrics displayMetrics = new DisplayMetrics(); display.getMetrics(displayMetrics); int width = displayMetrics.widthPixels / displayMetrics.densityDpi; int height = displayMetrics.heightPixels / displayMetrics.densityDpi; double screenDiagonal = Math.sqrt(width * width + height * height); return (screenDiagonal >= 8.5); } private void ReturnToValidationList() { ClearMessageBox(); PopFragmentBackStack(); if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE && isTablet()) { StartValidationListFragment(); StartEmptyFragment(); } else { ValidationListFragment validationListFragment = ValidationListFragment.newInstance("List"); getSupportFragmentManager().beginTransaction() .replace(MainActivity.validationListView.getId(), validationListFragment).commit(); } } private void PopFragmentBackStack() { // http://stackoverflow.com/questions/5802141/is-this-the-right-way-to-clean-up-fragment-back-stack-when-leaving-a-deeply-nest fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE); } private void ClearMessageBox() { messageTextView.setText(""); } }