Java tutorial
/* Copyright 2015 Google Inc. All Rights Reserved. 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.google.android.gcm.demo.ui; import android.annotation.TargetApi; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.res.Configuration; import android.content.res.TypedArray; import android.content.SharedPreferences; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.view.ActionMode; import android.support.v7.widget.Toolbar; import android.text.Html; import android.text.SpannableString; import android.util.DisplayMetrics; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.WindowInsets; import android.view.animation.Animation; import android.view.animation.Transformation; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.google.android.gcm.demo.R; import com.google.android.gcm.demo.service.LoggingService; import com.google.android.gcm.demo.service.LoggingService.Logger; import com.google.android.gcm.demo.ui.addressbook.SelectActivity; import java.util.List; /** * Tha app's main activity */ public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener { static final String PREF_LAST_SCREEN_ID = "selected_screen_id"; static final String PREF_OPEN_DRAWER_AT_STARTUP = "open_drawer_at_startup"; private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private FrameLayout mDrawerView; private ListView mDrawerMenu; private View mDrawerScrim; private Logger mLogger; private TextView mLogsUI; private BroadcastReceiver mLoggerCallback; private MainMenu mMainMenu; @Override protected void onCreate(Bundle savedState) { super.onCreate(savedState); setContentView(R.layout.activity_main); mLogger = new Logger(this); mLogsUI = (TextView) findViewById(R.id.logs); mLoggerCallback = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { switch (intent.getAction()) { case LoggingService.ACTION_CLEAR_LOGS: mLogsUI.setText(""); break; case LoggingService.ACTION_LOG: StringBuilder stringBuilder = new StringBuilder(); String newLog = intent.getStringExtra(LoggingService.EXTRA_LOG_MESSAGE); String oldLogs = Html.toHtml(new SpannableString(mLogsUI.getText())); appendFormattedLogLine(newLog, stringBuilder); stringBuilder.append(oldLogs); mLogsUI.setText(Html.fromHtml(stringBuilder.toString())); List<Fragment> fragments = getSupportFragmentManager().getFragments(); for (Fragment fragment : fragments) { if (fragment instanceof RefreshableFragment && fragment.isVisible()) { ((RefreshableFragment) fragment).refresh(); } } break; } } }; Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerView = (FrameLayout) findViewById(R.id.navigation_drawer); mDrawerMenu = (ListView) findViewById(R.id.navigation_drawer_menu); mDrawerScrim = findViewById(R.id.navigation_drawer_scrim); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); TypedArray colorPrimaryDark = getTheme().obtainStyledAttributes(new int[] { R.attr.colorPrimaryDark }); mDrawerLayout.setStatusBarBackgroundColor(colorPrimaryDark.getColor(0, 0xFF000000)); mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); colorPrimaryDark.recycle(); ImageView drawerHeader = new ImageView(this); drawerHeader.setImageResource(R.drawable.drawer_gcm_logo); mDrawerMenu.addHeaderView(drawerHeader); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // Set the drawer width accordingly with the guidelines: window_width - toolbar_height. toolbar.addOnLayoutChangeListener(new View.OnLayoutChangeListener() { @Override public void onLayoutChange(View view, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { if (left == 0 && top == 0 && right == 0 && bottom == 0) { return; } DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); float logicalDensity = metrics.density; int maxWidth = (int) Math.ceil(320 * logicalDensity); DrawerLayout.LayoutParams params = (DrawerLayout.LayoutParams) mDrawerView.getLayoutParams(); int newWidth = view.getWidth() - view.getHeight(); params.width = (newWidth > maxWidth ? maxWidth : newWidth); mDrawerView.setLayoutParams(params); } }); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) { mDrawerView.setOnApplyWindowInsetsListener(new View.OnApplyWindowInsetsListener() { @TargetApi(Build.VERSION_CODES.KITKAT_WATCH) @Override public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) { // Set scrim height to match status bar height. mDrawerScrim.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, insets.getSystemWindowInsetTop())); return insets; } }); } int activeItemIndicator = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) ? android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_checked; mMainMenu = new MainMenu(this); mDrawerMenu.setOnItemClickListener(this); mDrawerMenu.setAdapter(new ArrayAdapter<>(getSupportActionBar().getThemedContext(), activeItemIndicator, android.R.id.text1, mMainMenu.getEntries())); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) { @Override public void onDrawerOpened(View drawerView) { // The user learned how to open the drawer. Do not open it for him anymore. getAppPreferences().edit().putBoolean(PREF_OPEN_DRAWER_AT_STARTUP, false).apply(); super.onDrawerOpened(drawerView); } }; boolean activityResumed = (savedState != null); boolean openDrawer = getAppPreferences().getBoolean(PREF_OPEN_DRAWER_AT_STARTUP, true); int lastScreenId = getAppPreferences().getInt(PREF_LAST_SCREEN_ID, 0); selectItem(lastScreenId); if (!activityResumed && openDrawer) { mDrawerLayout.openDrawer(mDrawerView); } mDrawerLayout.setDrawerListener(mDrawerToggle); /* * Here we check if the Activity was created by the user clicking on one of our GCM * notifications: * 1. Check if the action of the intent used to launch the Activity. * 2. Print out any additional data sent with the notification. This is included as extras * on the intent. */ Intent launchIntent = getIntent(); if ("gcm_test_app_notification_click_action".equals(launchIntent.getAction())) { Bundle data = launchIntent.getExtras(); data.isEmpty(); // Force the bundle to unparcel so that toString() works String format = getResources().getString(R.string.notification_intent_received); mLogger.log(Log.INFO, String.format(format, data)); } } @Override public void onSupportActionModeStarted(ActionMode mode) { super.onSupportActionModeStarted(mode); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { // Set a status bar color while in action mode (text copy&paste) getWindow().setStatusBarColor(getResources().getColor(R.color.google_blue_900)); } } @Override public void onSupportActionModeFinished(ActionMode mode) { super.onSupportActionModeFinished(mode); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { // Reset status bar to transparent when leaving action mode (text copy&paste) getWindow().setStatusBarColor(getResources().getColor(R.color.transparent)); } } @Override public void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); mDrawerToggle.syncState(); } @Override protected void onResume() { super.onResume(); StringBuilder logs = new StringBuilder(); for (String log : mLogger.getLogsFromFile()) { appendFormattedLogLine(log, logs); logs.append("<br>"); } mLogsUI.setText(Html.fromHtml(logs.toString())); mLogger.registerCallback(mLoggerCallback); } @Override protected void onPause() { mLogger.unregisterCallback(mLoggerCallback); super.onPause(); } /** * Toggle the Logs View visibility with a nice animation. */ public void toggleLogsView(boolean showView) { final View logsView = findViewById(R.id.logs_layout); final View bodyView = findViewById(R.id.container); final FrameLayout.LayoutParams logsLayoutParams = (FrameLayout.LayoutParams) logsView.getLayoutParams(); final int startLogsY, endLogsY, startBodyY, endBodyY; if (showView) { // The logsView height set in XML is a placeholder, we need to compute at runtime // how much is 0.4 of the screen height. int height = (int) (0.4 * mDrawerLayout.getHeight()); // The LogsView is hidden being placed off-screen with a negative bottomMargin. // We need to update its height and bottomMargin to the correct runtime values. logsLayoutParams.bottomMargin = -logsLayoutParams.height; logsView.setLayoutParams(logsLayoutParams); logsLayoutParams.height = height; // Prepare the value for the Show animation. startLogsY = logsLayoutParams.bottomMargin; endLogsY = 0; startBodyY = 0; endBodyY = logsLayoutParams.height; } else { // Prepare the value for the Hide animation. startLogsY = 0; endLogsY = -logsLayoutParams.height; startBodyY = logsLayoutParams.height; endBodyY = 0; } final int deltaLogsY = endLogsY - startLogsY; final int deltaBodyY = endBodyY - startBodyY; Animation a = new Animation() { @Override protected void applyTransformation(float interpolatedTime, Transformation t) { logsLayoutParams.bottomMargin = (int) (startLogsY + deltaLogsY * interpolatedTime); logsView.setLayoutParams(logsLayoutParams); bodyView.setPadding(0, 0, 0, (int) (startBodyY + deltaBodyY * interpolatedTime)); } }; a.setDuration(500); logsView.startAnimation(a); } private void appendFormattedLogLine(String log, StringBuilder stringBuilder) { String[] logLines = log.split("\n"); if (logLines.length > 0) { logLines[0] = "<b>" + logLines[0] + "</b>"; for (String line : logLines) { if (line.startsWith("exception: ")) { continue; } int keySeparator = line.indexOf(": "); if (keySeparator > 0) { stringBuilder.append("<b>").append(line.substring(0, keySeparator + 1)).append("</b>") .append(line.substring(keySeparator + 1)).append("<br>"); } else { stringBuilder.append(line).append("<br>"); } } } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.overflow_menu, menu); return true; } private void selectItem(int pos) { if (pos < 0 || pos >= mMainMenu.getEntries().length) { pos = 0; } String titlePrefix = getString(R.string.main_activity_title_prefix); getSupportActionBar().setTitle(titlePrefix + mMainMenu.getEntries()[pos]); String nextFragmentTag = "FRAGMENT_TAG_" + Integer.toString(pos); Fragment currentFragment = getSupportFragmentManager().findFragmentById(R.id.container); if (currentFragment != null && nextFragmentTag.equals(currentFragment.getTag())) { return; } Fragment recycledFragment = getSupportFragmentManager().findFragmentByTag(nextFragmentTag); try { FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); if (currentFragment != null) { transaction.detach(currentFragment); } if (recycledFragment != null) { transaction.attach(recycledFragment); } else { transaction.add(R.id.container, mMainMenu.createFragment(pos), nextFragmentTag); } transaction.commit(); getSupportFragmentManager().executePendingTransactions(); // The header takes the first position. mDrawerMenu.setItemChecked(pos + 1, true); getAppPreferences().edit().putInt(PREF_LAST_SCREEN_ID, pos).apply(); } catch (InstantiationException e) { Log.wtf(LoggingService.LOG_TAG, "Error while instantiating the selected fragment", e); } catch (IllegalAccessException e) { Log.wtf(LoggingService.LOG_TAG, "Error while instantiating the selected fragment", e); } } private SharedPreferences getAppPreferences() { return PreferenceManager.getDefaultSharedPreferences(this); } @Override public void onItemClick(AdapterView<?> parent, View view, int pos, long id) { selectItem(pos - 1); mDrawerLayout.closeDrawer(mDrawerView); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onOptionsItemSelected(MenuItem item) { return (mDrawerToggle.onOptionsItemSelected(item) || mMainMenu.onOverflowMenuItemSelected(item) || super.onOptionsItemSelected(item)); } @Override protected void onDestroy() { mLogger.unregisterCallback(mLoggerCallback); super.onDestroy(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { AbstractFragment currentFragment = (AbstractFragment) getSupportFragmentManager() .findFragmentById(R.id.container); int id = data.getIntExtra(SelectActivity.INTENT_EXTRA_ID, 0); String name = data.getStringExtra(SelectActivity.INTENT_EXTRA_NAME); String value = data.getStringExtra(SelectActivity.INTENT_EXTRA_VALUE); currentFragment.handleAddressBookSelection(id, name, value); } } static public void showToast(final Context context, final int msgId, final Object... args) { Handler handler = new Handler(context.getMainLooper()); handler.post(new Runnable() { public void run() { Toast.makeText(context, context.getString(msgId, args), Toast.LENGTH_LONG).show(); } }); } public interface RefreshableFragment { void refresh(); } }