Java tutorial
/* * Copyright (c) 2015 Ha Duy Trung * * 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 io.github.hidroh.materialistic; import android.content.Context; import android.os.Bundle; import android.support.v4.content.ContextCompat; import android.support.v7.app.ActionBar; import android.support.v7.widget.Toolbar; import android.text.TextUtils; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.webkit.WebView; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.lang.ref.WeakReference; import javax.inject.Inject; import io.github.hidroh.materialistic.accounts.UserServices; import io.github.hidroh.materialistic.annotation.Synthetic; public class ComposeActivity extends InjectableActivity { public static final String EXTRA_PARENT_ID = ComposeActivity.class.getName() + ".EXTRA_PARENT_ID"; public static final String EXTRA_PARENT_TEXT = ComposeActivity.class.getName() + ".EXTRA_PARENT_TEXT"; private static final String HN_FORMAT_DOC_URL = "https://news.ycombinator.com/formatdoc"; private static final String FORMAT_QUOTE = "> %s\n\n"; private static final String PARAGRAPH_QUOTE = "\n\n> "; private static final String PARAGRAPH_BREAK_REGEX = "[\\n]{2,}"; @Inject UserServices mUserServices; @Inject AlertDialogBuilder mAlertDialogBuilder; private EditText mEditText; private String mParentText; private String mQuoteText; private String mParentId; private boolean mSending; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mParentId = getIntent().getStringExtra(EXTRA_PARENT_ID); if (TextUtils.isEmpty(mParentId)) { finish(); return; } AppUtils.setStatusBarColor(getWindow(), ContextCompat.getColor(this, R.color.blackT12)); setContentView(R.layout.activity_compose); setSupportActionBar((Toolbar) findViewById(R.id.toolbar)); //noinspection ConstantConditions getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_HOME_AS_UP); mEditText = (EditText) findViewById(R.id.edittext_body); if (savedInstanceState == null) { mEditText.setText(Preferences.getDraft(this, mParentId)); } findViewById(R.id.empty).setOnClickListener(v -> mEditText.requestFocus()); findViewById(R.id.empty).setOnLongClickListener(v -> { mEditText.requestFocus(); return mEditText.performLongClick(); }); mParentText = getIntent().getStringExtra(EXTRA_PARENT_TEXT); if (!TextUtils.isEmpty(mParentText)) { findViewById(R.id.quote).setVisibility(View.VISIBLE); final TextView toggle = (TextView) findViewById(R.id.toggle); final TextView textView = (TextView) findViewById(R.id.text); AppUtils.setTextWithLinks(textView, AppUtils.fromHtml(mParentText)); toggle.setOnClickListener(v -> { if (textView.getVisibility() == View.VISIBLE) { toggle.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_expand_more_white_24dp, 0); textView.setVisibility(View.GONE); } else { toggle.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_expand_less_white_24dp, 0); textView.setVisibility(View.VISIBLE); } }); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_compose, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { menu.findItem(R.id.menu_quote).setVisible(!mSending && !TextUtils.isEmpty(mParentText)); menu.findItem(R.id.menu_send).setEnabled(!mSending); menu.findItem(R.id.menu_save_draft).setEnabled(!mSending); menu.findItem(R.id.menu_discard_draft).setEnabled(!mSending); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.menu_send) { if (mEditText.length() == 0) { Toast.makeText(this, R.string.comment_required, Toast.LENGTH_SHORT).show(); return false; } else { send(); return true; } } if (item.getItemId() == R.id.menu_quote) { mEditText.getEditableText().insert(0, createQuote()); } if (item.getItemId() == android.R.id.home) { onBackPressed(); return true; } if (item.getItemId() == R.id.menu_save_draft) { Preferences.saveDraft(this, mParentId, mEditText.getText().toString()); return true; } if (item.getItemId() == R.id.menu_discard_draft) { Preferences.deleteDraft(this, mParentId); return true; } if (item.getItemId() == R.id.menu_guidelines) { WebView webView = new WebView(ComposeActivity.this); webView.loadUrl(HN_FORMAT_DOC_URL); mAlertDialogBuilder.init(ComposeActivity.this).setView(webView) .setPositiveButton(android.R.string.ok, null).show(); return true; } return super.onOptionsItemSelected(item); } @Override public void onBackPressed() { if (mEditText.length() == 0 || mSending || TextUtils.equals(Preferences.getDraft(this, mParentId), mEditText.getText().toString())) { super.onBackPressed(); return; } mAlertDialogBuilder.init(this).setMessage(R.string.confirm_save_draft) .setNegativeButton(android.R.string.no, (dialog, which) -> ComposeActivity.super.onBackPressed()) .setPositiveButton(android.R.string.yes, (dialog, which) -> { Preferences.saveDraft(this, mParentId, mEditText.getText().toString()); ComposeActivity.super.onBackPressed(); }).show(); } private void send() { String content = mEditText.getText().toString(); Preferences.saveDraft(this, mParentId, content); toggleControls(true); Toast.makeText(this, R.string.sending, Toast.LENGTH_SHORT).show(); mUserServices.reply(this, mParentId, content, new ComposeCallback(this, mParentId)); } @Synthetic void onSent(Boolean successful) { if (successful == null) { Toast.makeText(this, R.string.comment_failed, Toast.LENGTH_SHORT).show(); toggleControls(false); } else if (successful) { Toast.makeText(this, R.string.comment_successful, Toast.LENGTH_SHORT).show(); if (!isFinishing()) { finish(); // TODO refresh parent } } else { if (!isFinishing()) { AppUtils.showLogin(this, mAlertDialogBuilder); } toggleControls(false); } } private String createQuote() { if (mQuoteText == null) { mQuoteText = String.format(FORMAT_QUOTE, AppUtils.fromHtml(mParentText).toString().trim() .replaceAll(PARAGRAPH_BREAK_REGEX, PARAGRAPH_QUOTE)); } return mQuoteText; } private void toggleControls(boolean sending) { if (isFinishing()) { return; } mSending = sending; mEditText.setEnabled(!sending); supportInvalidateOptionsMenu(); } static class ComposeCallback extends UserServices.Callback { private final WeakReference<ComposeActivity> mComposeActivity; private final Context mAppContext; private final String mParentId; @Synthetic ComposeCallback(ComposeActivity composeActivity, String parentId) { mComposeActivity = new WeakReference<>(composeActivity); mAppContext = composeActivity.getApplicationContext(); mParentId = parentId; } @Override public void onDone(boolean successful) { Preferences.deleteDraft(mAppContext, mParentId); if (mComposeActivity.get() != null && !mComposeActivity.get().isActivityDestroyed()) { mComposeActivity.get().onSent(successful); } } @Override public void onError(Throwable throwable) { if (mComposeActivity.get() != null && !mComposeActivity.get().isActivityDestroyed()) { mComposeActivity.get().onSent(null); } } } }