Java tutorial
/* * The MIT License (MIT) * Copyright (c) 2014 longkai * The software shall be used for good, not evil. */ package org.catnut.ui; import android.app.ActionBar; import android.app.Activity; import android.app.AlertDialog; import android.app.Fragment; import android.app.FragmentManager; import android.content.AsyncQueryHandler; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Configuration; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.Process; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.widget.DrawerLayout; import android.text.TextUtils; import android.text.format.DateUtils; import android.view.Gravity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewTreeObserver; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.android.volley.Response; import com.android.volley.VolleyError; import com.google.analytics.tracking.android.EasyTracker; import com.squareup.picasso.Picasso; import org.catnut.R; import org.catnut.api.StuffAPI; import org.catnut.core.CatnutApp; import org.catnut.core.CatnutProvider; import org.catnut.core.CatnutRequest; import org.catnut.fragment.ConversationFragment; import org.catnut.fragment.DraftFragment; import org.catnut.fragment.FavoriteFragment; import org.catnut.fragment.HomeTimelineFragment; import org.catnut.fragment.MentionTimelineFragment; import org.catnut.fragment.MyRelationshipFragment; import org.catnut.fragment.UserTimelineFragment; import org.catnut.metadata.Status; import org.catnut.metadata.User; import org.catnut.metadata.WeiboAPIError; import org.catnut.support.ConfirmBarController; import org.catnut.support.FragmentCallbackFromActivity; import org.catnut.support.QuickReturnScrollView; import org.catnut.util.CatnutUtils; import org.catnut.util.Constants; import org.json.JSONObject; import java.io.File; import java.util.ArrayList; /** * ?? * * @author longkai */ public class MainActivity extends Activity implements DrawerLayout.DrawerListener, View.OnClickListener, FragmentManager.OnBackStackChangedListener, QuickReturnScrollView.Callbacks { private static final String TAG = "MainActivity"; private ScrollSettleHandler mScrollSettleHandler = new ScrollSettleHandler(); private CatnutApp mApp; private EasyTracker mTracker; private ActionBar mActionBar; private DrawerLayout mDrawerLayout; private View mPlaceholderView; private View mQuickReturnView; private QuickReturnScrollView mQuickReturnDrawer; private ActionBarDrawerToggle mDrawerToggle; private int mMinRawY = 0; private int mState = STATE_ON_SCREEN; private int mQuickReturnHeight; private int mMaxScrollY; private String mNick; private ImageView mProfileCover; private TextView mTextNick; private TextView mDescription; private long mLastFetchMillis; private TextView mNewTweet; private TextView mNewMention; private TextView mNewComment; private boolean mInitNewsFetcher = false; private MenuItem mCompose; private MenuItem mNews; private ConfirmBarController.Callbacks mCallbacks; private FragmentCallbackFromActivity mRefreshCallback; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mApp = CatnutApp.getTingtingApp(); mActionBar = getActionBar(); mActionBar.setIcon(R.drawable.ic_title_home); setContentView(R.layout.main); // drawer specific mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, Gravity.START); mDrawerLayout.setDrawerListener(this); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, R.string.open_drawer, R.string.close_drawer); // the whole left drawer mQuickReturnDrawer = (QuickReturnScrollView) findViewById(R.id.drawer); mQuickReturnDrawer.setCallbacks(this); mQuickReturnView = findViewById(R.id.quick_return); mPlaceholderView = findViewById(R.id.place_holder); mQuickReturnDrawer.getViewTreeObserver() .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { onScrollChanged(mQuickReturnDrawer.getScrollY()); mMaxScrollY = mQuickReturnDrawer.computeVerticalScrollRange() - mQuickReturnDrawer.getHeight(); mQuickReturnHeight = mQuickReturnView.getHeight(); } }); // drawer customized view mProfileCover = (ImageView) findViewById(R.id.avatar_profile); mTextNick = (TextView) findViewById(R.id.nick); mDescription = (TextView) findViewById(R.id.description); prepareDrawer(); injectListeners(); if (savedInstanceState == null) { HomeTimelineFragment fragment = HomeTimelineFragment.getFragment(); mCallbacks = fragment; mRefreshCallback = fragment; getFragmentManager().beginTransaction() .replace(R.id.fragment_container, fragment, HomeTimelineFragment.TAG).commit(); } getFragmentManager().addOnBackStackChangedListener(this); if (mApp.getPreferences().getBoolean(getString(R.string.pref_enable_analytics), true)) { mTracker = EasyTracker.getInstance(this); } } @Override protected void onStart() { super.onStart(); if (mTracker != null) { mTracker.activityStart(this); } } @Override protected void onStop() { super.onStop(); if (mTracker != null) { mTracker.activityStop(this); } } @Override protected void onSaveInstanceState(Bundle outState) { if (mCallbacks != null) { mCallbacks.onActivitySaveInstanceState(outState); } super.onSaveInstanceState(outState); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); if (mCallbacks != null) { mCallbacks.onActivityRestoreInstanceState(savedInstanceState); } } private void prepareDrawer() { // for drawer mActionBar.setDisplayHomeAsUpEnabled(true); mActionBar.setHomeButtonEnabled(true); // for user' s profile new AsyncQueryHandler(getContentResolver()) { @Override protected void onQueryComplete(int token, Object cookie, Cursor cursor) { if (cursor.moveToNext()) { mNick = cursor.getString(cursor.getColumnIndex(User.screen_name)); mTextNick.setText(mNick); Picasso.with(MainActivity.this).load(cursor.getString(cursor.getColumnIndex(User.avatar_large))) .placeholder(R.drawable.error).error(R.drawable.error).into(mProfileCover); TextView location = (TextView) findViewById(R.id.location); location.setText(cursor.getString(cursor.getColumnIndex(User.location))); String description = cursor.getString(cursor.getColumnIndex(User.description)); mDescription.setText( TextUtils.isEmpty(description) ? getString(R.string.no_description) : description); View flowingCount = findViewById(R.id.following_count); CatnutUtils.setText(flowingCount, android.R.id.text1, cursor.getString(cursor.getColumnIndex(User.friends_count))); CatnutUtils.setText(flowingCount, android.R.id.text2, getString(R.string.followings)); View flowerCount = findViewById(R.id.followers_count); CatnutUtils.setText(flowerCount, android.R.id.text1, cursor.getString(cursor.getColumnIndex(User.followers_count))); CatnutUtils.setText(flowerCount, android.R.id.text2, getString(R.string.followers)); View tweetsCount = findViewById(R.id.tweets_count); tweetsCount.setOnClickListener(MainActivity.this); flowingCount.setOnClickListener(MainActivity.this); flowerCount.setOnClickListener(MainActivity.this); CatnutUtils.setText(tweetsCount, android.R.id.text1, cursor.getString(cursor.getColumnIndex(User.statuses_count))); CatnutUtils.setText(tweetsCount, android.R.id.text2, getString(R.string.tweets)); } cursor.close(); } }.startQuery(0, null, CatnutProvider.parse(User.MULTIPLE, mApp.getAccessToken().uid), new String[] { User.screen_name, User.avatar_large, User.description, User.statuses_count, User.followers_count, User.friends_count, User.verified, User.location }, null, null, null); } // ? private void fetchNews() { mApp.getRequestQueue().add(new CatnutRequest(this, StuffAPI.unread_count(mApp.getAccessToken().uid, 0), null, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { CatnutUtils.setText(mNewTweet, android.R.id.text1, String.valueOf(response.optInt(Status.SINGLE))); CatnutUtils.setText(mNewComment, android.R.id.text1, String.valueOf(response.optInt("cmt"))); CatnutUtils.setText(mNewMention, android.R.id.text1, String.valueOf(response.optInt("mention_status"))); mLastFetchMillis = System.currentTimeMillis(); setNewsHint(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { WeiboAPIError weiboAPIError = WeiboAPIError.fromVolleyError(error); Toast.makeText(MainActivity.this, weiboAPIError.error, Toast.LENGTH_LONG).show(); } })); } private void setNewsHint() { if (mDrawerLayout.isDrawerOpen(mQuickReturnDrawer)) { getActionBar().setSubtitle(mLastFetchMillis == 0L ? getString(R.string.refresh_see_news_count) : DateUtils.getRelativeTimeSpanString(mLastFetchMillis)); } } private void injectListeners() { findViewById(R.id.action_my_tweets).setOnClickListener(this); findViewById(R.id.action_my_list).setOnClickListener(this); findViewById(R.id.action_my_favorites).setOnClickListener(this); findViewById(R.id.action_my_drafts).setOnClickListener(this); findViewById(R.id.action_share_app).setOnClickListener(this); findViewById(R.id.action_view_source_code).setOnClickListener(this); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); mCompose = menu.findItem(R.id.action_compose); mNews = menu.findItem(R.id.action_refresh_news_count); mNews.setVisible(false); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // open or close the drawer if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } switch (item.getItemId()) { // killapp??back???back stack case R.id.logout: new AlertDialog.Builder(this).setMessage(getString(R.string.logout_confirm)) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Process.killProcess(Process.myPid()); } }).setNegativeButton(android.R.string.no, null).show(); break; // ??? case R.id.cancellation: new AlertDialog.Builder(this).setMessage(getString(R.string.cancellation_confirm)) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { mApp.invalidateAccessToken(); Intent intent = new Intent(MainActivity.this, HelloActivity.class); // ?back stack intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } }).setNegativeButton(android.R.string.no, null).show(); break; case R.id.pref: startActivity(SingleFragmentActivity.getIntent(this, SingleFragmentActivity.PREF)); break; case R.id.action_compose: startActivity(new Intent(this, ComposeTweetActivity.class)); break; case R.id.fantasy: startActivity(new Intent(this, HelloActivity.class).putExtra(HelloActivity.TAG, HelloActivity.TAG)); break; case R.id.plugins: switch2Plugins(null); break; case R.id.action_refresh_news_count: fetchNews(); break; default: break; } return super.onOptionsItemSelected(item); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mDrawerToggle.onConfigurationChanged(newConfig); } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onDrawerOpened(View drawerView) { mDrawerToggle.onDrawerOpened(drawerView); mCompose.setVisible(false); mNews.setVisible(true); setNewsHint(); if (!mInitNewsFetcher) { View newTweet = findViewById(R.id.new_tweet); CatnutUtils.setText(newTweet, android.R.id.text1, "?"); CatnutUtils.setText(newTweet, android.R.id.text2, getString(R.string.new_tweet_count)); mNewTweet = (TextView) newTweet.findViewById(android.R.id.text1); newTweet.setOnClickListener(this); View newComment = findViewById(R.id.new_comment); mNewComment = (TextView) newComment.findViewById(android.R.id.text1); CatnutUtils.setText(newComment, android.R.id.text1, "?"); CatnutUtils.setText(newComment, android.R.id.text2, getString(R.string.new_comment_count)); newComment.setOnClickListener(this); View newMention = findViewById(R.id.new_mention); mNewMention = (TextView) newMention.findViewById(android.R.id.text1); CatnutUtils.setText(newMention, android.R.id.text1, "?"); CatnutUtils.setText(newMention, android.R.id.text2, getString(R.string.new_mention_count)); newMention.setOnClickListener(this); mInitNewsFetcher = true; } } @Override public void onDrawerClosed(View drawerView) { mDrawerToggle.onDrawerClosed(drawerView); mCompose.setVisible(true); mNews.setVisible(false); getActionBar().setSubtitle(null); } @Override public void onDrawerSlide(View drawerView, float slideOffset) { mDrawerToggle.onDrawerSlide(drawerView, slideOffset); } @Override public void onDrawerStateChanged(int newState) { mDrawerToggle.onDrawerStateChanged(newState); } @Override public void onBackStackChanged() { invalidateOptionsMenu(); } @Override public void onClick(View v) { int id = v.getId(); Fragment fragment = null; String tag = null; mDrawerLayout.closeDrawer(mQuickReturnDrawer); switch (id) { case R.id.tweets_count: case R.id.action_my_tweets: fragment = UserTimelineFragment.getFragment(mApp.getAccessToken().uid, mApp.getPreferences().getString(User.screen_name, null)); tag = UserTimelineFragment.TAG; break; case R.id.following_count: fragment = MyRelationshipFragment.getFragment(true); tag = "true"; break; case R.id.followers_count: fragment = MyRelationshipFragment.getFragment(false); tag = "false"; break; case R.id.action_my_favorites: fragment = FavoriteFragment.getFragment(); tag = FavoriteFragment.TAG; break; case R.id.action_my_drafts: fragment = DraftFragment.getFragment(); tag = DraftFragment.TAG; break; case R.id.action_share_app: Intent intent = new Intent(Intent.ACTION_SEND); intent.setType(getString(R.string.mime_image)); intent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.share_app)); intent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_text)); intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(getExternalCacheDir() + File.separator + Constants.SHARE_IMAGE))); startActivity(intent); return; case R.id.action_view_source_code: startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.github_link)))); return; case R.id.new_tweet: // Fragment home = getFragmentManager().findFragmentByTag(HomeTimelineFragment.TAG); // never null, but we still check it. if (home == null || !home.isVisible()) { fragment = HomeTimelineFragment.getFragment(); tag = HomeTimelineFragment.TAG; } else { if (mRefreshCallback != null) { mRefreshCallback.callback(null); } } mNewTweet.setText("0"); break; case R.id.new_mention: fragment = MentionTimelineFragment.getFragment(); tag = MentionTimelineFragment.TAG; mNewMention.setText("0"); break; case R.id.new_comment: fragment = ConversationFragment.getFragment(); tag = ConversationFragment.TAG; mNewComment.setText("0"); break; case R.id.action_my_list: default: Toast.makeText(this, "sorry, not yet implemented =.=", Toast.LENGTH_SHORT).show(); return; } if (fragment != null) { pendingFragment(fragment, tag); } } // ?????? public void switch2Plugins(View view) { if (mDrawerLayout.isDrawerOpen(mQuickReturnDrawer)) { mDrawerLayout.closeDrawer(mQuickReturnDrawer); } if (view != null) { // ?layout xml String key = (String) view.getTag(); SharedPreferences pref = CatnutApp.getTingtingApp().getPreferences(); if (!pref.contains(key)) { // fantasy salutation startActivity(new Intent(this, HelloActivity.class).putExtra(HelloActivity.TAG, HelloActivity.TAG)); return; // stop here } else { boolean enable = pref.getBoolean(key, getResources().getBoolean(R.bool.default_plugin_status)); if (!enable) { startActivity(SingleFragmentActivity.getIntent(this, SingleFragmentActivity.PLUGINS_PREF)); return; // stop here } } } ArrayList<Integer> plugins = CatnutUtils.enabledPlugins(); if (plugins != null) { Intent intent = new Intent(this, PluginsActivity.class); intent.putExtra(PluginsActivity.PLUGINS, plugins); startActivity(intent); } else { startActivity(SingleFragmentActivity.getIntent(this, SingleFragmentActivity.PLUGINS_PREF)); } } /** * ?fragment * * @param fragment * @param tag null?? */ private void pendingFragment(Fragment fragment, String tag) { FragmentManager fragmentManager = getFragmentManager(); Fragment tmp = fragmentManager.findFragmentByTag(tag); if (tmp == null || !tmp.isVisible()) { fragmentManager.beginTransaction() .setCustomAnimations(R.animator.fragment_slide_left_enter, R.animator.fragment_slide_left_exit, R.animator.fragment_slide_right_enter, R.animator.fragment_slide_right_exit) .replace(R.id.fragment_container, fragment, tag).addToBackStack(null).commit(); mScrollSettleHandler.post(new Runnable() { @Override public void run() { invalidateOptionsMenu(); } }); } } @Override public void onScrollChanged(int scrollY) { scrollY = Math.min(mMaxScrollY, scrollY); mScrollSettleHandler.onScroll(scrollY); int rawY = mPlaceholderView.getTop() - scrollY; int translationY = 0; switch (mState) { case STATE_OFF_SCREEN: if (rawY <= mMinRawY) { mMinRawY = rawY; } else { mState = STATE_RETURNING; } translationY = rawY; break; case STATE_ON_SCREEN: if (rawY < -mQuickReturnHeight) { mState = STATE_OFF_SCREEN; mMinRawY = rawY; } translationY = rawY; break; case STATE_RETURNING: translationY = (rawY - mMinRawY) - mQuickReturnHeight; if (translationY > 0) { translationY = 0; mMinRawY = rawY - mQuickReturnHeight; } if (rawY > 0) { mState = STATE_ON_SCREEN; translationY = rawY; } if (translationY < -mQuickReturnHeight) { mState = STATE_OFF_SCREEN; mMinRawY = rawY; } break; } mQuickReturnView.animate().cancel(); mQuickReturnView.setTranslationY(translationY + scrollY); } @Override public void onDownMotionEvent() { mScrollSettleHandler.setSettleEnabled(false); } @Override public void onUpOrCancelMotionEvent() { mScrollSettleHandler.setSettleEnabled(true); mScrollSettleHandler.onScroll(mQuickReturnDrawer.getScrollY()); } // quick return animation private class ScrollSettleHandler extends Handler { private static final int SETTLE_DELAY_MILLIS = 100; private int mSettledScrollY = Integer.MIN_VALUE; private boolean mSettleEnabled; public void onScroll(int scrollY) { if (mSettledScrollY != scrollY) { // Clear any pending messages and post delayed removeMessages(0); sendEmptyMessageDelayed(0, SETTLE_DELAY_MILLIS); mSettledScrollY = scrollY; } } public void setSettleEnabled(boolean settleEnabled) { mSettleEnabled = settleEnabled; } @Override public void handleMessage(Message msg) { // Handle the scroll settling. if (STATE_RETURNING == mState && mSettleEnabled) { int mDestTranslationY; if (mSettledScrollY - mQuickReturnView.getTranslationY() > mQuickReturnHeight / 2) { mState = STATE_OFF_SCREEN; mDestTranslationY = Math.max(mSettledScrollY - mQuickReturnHeight, mPlaceholderView.getTop()); } else { mDestTranslationY = mSettledScrollY; } mMinRawY = mPlaceholderView.getTop() - mQuickReturnHeight - mDestTranslationY; mQuickReturnView.animate().translationY(mDestTranslationY); } mSettledScrollY = Integer.MIN_VALUE; // reset } } }