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.Intent; import android.net.Uri; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.TextInputLayout; 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.webkit.WebChromeClient; import android.webkit.WebView; import android.widget.TextView; import android.widget.Toast; import java.lang.ref.WeakReference; import java.net.MalformedURLException; import java.net.URL; import java.util.regex.Matcher; import java.util.regex.Pattern; import javax.inject.Inject; import io.github.hidroh.materialistic.accounts.UserServices; import io.github.hidroh.materialistic.annotation.Synthetic; public class SubmitActivity extends InjectableActivity { private static final String HN_GUIDELINES_URL = "https://news.ycombinator.com/newsguidelines.html"; private static final String STATE_SUBJECT = "state:subject"; private static final String STATE_TEXT = "state:text"; // matching title url without any trailing text private static final String REGEX_FUZZY_URL = "(.*)((http|https)://[^\\s]*)$"; @Inject UserServices mUserServices; @Inject AlertDialogBuilder mAlertDialogBuilder; @Synthetic TextView mTitleEditText; private TextView mContentEditText; private TextInputLayout mTitleLayout; private TextInputLayout mContentLayout; private boolean mSending; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); AppUtils.setStatusBarColor(getWindow(), ContextCompat.getColor(this, R.color.blackT12)); setContentView(R.layout.activity_submit); setSupportActionBar((Toolbar) findViewById(R.id.toolbar)); //noinspection ConstantConditions getSupportActionBar().setDisplayOptions( ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_HOME_AS_UP); mTitleLayout = (TextInputLayout) findViewById(R.id.textinput_title); mContentLayout = (TextInputLayout) findViewById(R.id.textinput_content); mTitleEditText = (TextView) findViewById(R.id.edittext_title); mContentEditText = (TextView) findViewById(R.id.edittext_content); String text, subject; if (savedInstanceState == null) { subject = getIntent().getStringExtra(Intent.EXTRA_SUBJECT); text = getIntent().getStringExtra(Intent.EXTRA_TEXT); } else { subject = savedInstanceState.getString(STATE_SUBJECT); text = savedInstanceState.getString(STATE_TEXT); } mTitleEditText.setText(subject); mContentEditText.setText(text); if (TextUtils.isEmpty(subject)) { if (isUrl(text)) { WebView webView = new WebView(this); webView.setWebChromeClient(new WebChromeClient() { @Override public void onReceivedTitle(WebView view, String title) { if (mTitleEditText.length() == 0) { mTitleEditText.setText(title); } } }); webView.loadUrl(text); } else if (!TextUtils.isEmpty(text)) { extractUrl(text); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_submit, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { menu.findItem(R.id.menu_send).setEnabled(!mSending); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { onBackPressed(); return true; } if (item.getItemId() == R.id.menu_send) { if (!validate()) { return true; } final boolean isUrl = isUrl(mContentEditText.getText().toString()); mAlertDialogBuilder.init(SubmitActivity.this) .setMessage(isUrl ? R.string.confirm_submit_url : R.string.confirm_submit_question) .setPositiveButton(android.R.string.ok, (dialog, which) -> submit(isUrl)) .setNegativeButton(android.R.string.cancel, null).create().show(); return true; } if (item.getItemId() == R.id.menu_guidelines) { WebView webView = new WebView(this); webView.loadUrl(HN_GUIDELINES_URL); mAlertDialogBuilder.init(this).setView(webView).setPositiveButton(android.R.string.ok, null).create() .show(); } return super.onOptionsItemSelected(item); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString(STATE_SUBJECT, mTitleEditText.getText().toString()); outState.putString(STATE_TEXT, mContentEditText.getText().toString()); } @Override public void onBackPressed() { mAlertDialogBuilder.init(this) .setMessage(mSending ? R.string.confirm_no_waiting : R.string.confirm_no_submit) .setNegativeButton(android.R.string.cancel, null) .setPositiveButton(android.R.string.ok, (dialog, which) -> SubmitActivity.super.onBackPressed()) .show(); } private boolean validate() { mTitleLayout.setErrorEnabled(false); mContentLayout.setErrorEnabled(false); if (mTitleEditText.length() == 0) { mTitleLayout.setError(getString(R.string.title_required)); } if (mContentEditText.length() == 0) { mContentLayout.setError(getString(R.string.url_text_required)); } return mTitleEditText.length() > 0 && mContentEditText.length() > 0; } private void submit(boolean isUrl) { toggleControls(true); Toast.makeText(this, R.string.sending, Toast.LENGTH_SHORT).show(); mUserServices.submit(this, mTitleEditText.getText().toString(), mContentEditText.getText().toString(), isUrl, new SubmitCallback(this)); } @Synthetic void onSubmitted(Boolean successful) { if (successful == null) { toggleControls(false); Toast.makeText(this, R.string.submit_failed, Toast.LENGTH_SHORT).show(); } else if (successful) { Toast.makeText(this, R.string.submit_successful, Toast.LENGTH_SHORT).show(); if (!isFinishing()) { Intent intent = new Intent(this, NewActivity.class); intent.putExtra(NewActivity.EXTRA_REFRESH, true); intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); startActivity(intent); // TODO should go to profile instead? finish(); } } else if (!isFinishing()) { AppUtils.showLogin(this, mAlertDialogBuilder); } } @Synthetic void onError(int message, Uri data) { Toast.makeText(this, message, Toast.LENGTH_SHORT).show(); if (data != null) { startActivity(new Intent(Intent.ACTION_VIEW).setData(data)); } } private boolean isUrl(String text) { try { new URL(text); // try parsing } catch (MalformedURLException e) { return false; } return true; } private void extractUrl(String text) { Matcher matcher = Pattern.compile(REGEX_FUZZY_URL).matcher(text); if (matcher.find() && matcher.groupCount() >= 3) { // group 1: title, group 2: url, group 3: scheme mTitleEditText.setText(trimTitle(matcher.group(1).trim())); mContentEditText.setText(matcher.group(2)); } } @NonNull private String trimTitle(String title) { int lastIndex = title.length() - 1; while (lastIndex >= 0) { char c = title.charAt(lastIndex); if (c == ' ' || c == ':' || c == '-') { lastIndex--; } else { break; } } return lastIndex >= 0 ? title.substring(0, lastIndex + 1) : ""; } private void toggleControls(boolean sending) { if (isFinishing()) { return; } mSending = sending; mTitleEditText.setEnabled(!sending); mContentEditText.setEnabled(!sending); supportInvalidateOptionsMenu(); } static class SubmitCallback extends UserServices.Callback { private final WeakReference<SubmitActivity> mSubmitActivity; @Synthetic SubmitCallback(SubmitActivity submitActivity) { mSubmitActivity = new WeakReference<>(submitActivity); } @Override public void onDone(boolean successful) { if (mSubmitActivity.get() != null && !mSubmitActivity.get().isActivityDestroyed()) { mSubmitActivity.get().onSubmitted(successful); } } @Override public void onError(Throwable throwable) { if (mSubmitActivity.get() != null && !mSubmitActivity.get().isActivityDestroyed()) { if (throwable instanceof UserServices.Exception) { UserServices.Exception e = (UserServices.Exception) throwable; mSubmitActivity.get().onError(e.message, e.data); } else { mSubmitActivity.get().onSubmitted(null); } } } } }