Java tutorial
/** * Copyright (C) 2014 Twitter Inc and other contributors. * * 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.fabric.samples.cannonball.activity; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.ClipData; import android.content.ClipDescription; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.os.CountDownTimer; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.view.ViewPager; import android.util.SparseIntArray; import android.view.DragEvent; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.crashlytics.android.Crashlytics; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Calendar; import java.util.List; import java.util.Locale; import io.fabric.samples.cannonball.App; import io.fabric.samples.cannonball.AppService; import io.fabric.samples.cannonball.R; import io.fabric.samples.cannonball.model.Theme; import io.fabric.samples.cannonball.model.WordBank; import io.fabric.samples.cannonball.view.CountdownView; import io.fabric.samples.cannonball.view.FlowLayout; import io.fabric.samples.cannonball.view.ImageAdapter; public class PoemBuilderActivity extends Activity { public static final String KEY_THEME = "Theme"; private static final String TAG = "PoemBuilder"; private static final int PLAY_TIME = 60; private static final int PLACEHOLDER_POSITION = -1; private Theme poemTheme; private FlowLayout poemContainer; private FlowLayout wordsContainer; private ViewPager poemImagePager; private WordBank wordBank; private TextView placeholder; private PoemCreatedReceiver poemCreatedReceiver; private CountDownTimer countDown; private CountdownView countdownView; private TextView countdownText; private TextView shuffleText; private ImageView tick; private List<String> suffixes; private DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US); private boolean areCrashesEnabled; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_poem_builder); areCrashesEnabled = App.getInstance().areCrashesEnabled(); poemTheme = (Theme) getIntent().getSerializableExtra(KEY_THEME); setUpViews(); } private void setUpViews() { setUpCountDown(); setUpWordContainers(); setUpBack(); setUpShuffle(); setUpSavePoem(); } private void setUpSavePoem() { // Tick button, when you are done tick = (ImageView) findViewById(R.id.tick); tick.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Crashlytics.log("PoemBuilder: clicked to save poem"); countDown.cancel(); createPoem(); } }); } private void setUpShuffle() { // Shuffle button shuffleText = (TextView) findViewById(R.id.shuffle); shuffleText.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { shuffleWords(); } }); } private void setUpBack() { // go back if clicked final ImageView backButton = (ImageView) findViewById(R.id.back); backButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { onBackPressed(); } }); } private void setUpWordContainers() { // Setting up the word containers with random words wordsContainer = (FlowLayout) findViewById(R.id.words_container); wordsContainer.setOnDragListener(new PanelDragListener()); poemContainer = (FlowLayout) findViewById(R.id.poem_container); poemContainer.setOnDragListener(new PanelDragListener()); wordBank = new WordBank(getApplicationContext(), poemTheme); shuffleWords(); poemImagePager = (ViewPager) findViewById(R.id.poem_image_pager); poemImagePager.setAdapter(new ImageAdapter(getApplicationContext(), poemTheme)); poemContainer.setOnTouchListener(new ImageTouchListener()); // Placeholder used by drag and drop placeholder = (TextView) findViewById(R.id.placeholder); placeholder.setText(""); final int PLACEHOLDER = 42; placeholder.setTag(PLACEHOLDER); suffixes = Arrays.asList(getResources().getStringArray(R.array.wordbank_suffixes)); } private void setUpCountDown() { countdownView = (CountdownView) findViewById(R.id.countdown_spinner_view); countdownText = (TextView) findViewById(R.id.countdown_count); countDown = createCountdown(PLAY_TIME); } @Override public void onBackPressed() { Crashlytics.log("PoemBuilder: getting back, user cancelled the poem creation"); super.onBackPressed(); countDown.cancel(); } private void createPoem() { if (poemContainer.getChildCount() > 0) { final String poemText = getPoemText(); final SparseIntArray imgList = poemTheme.getImageList(); // the line below seems weird, but relies on the fact that the index of SparseIntArray could be any integer final int poemImage = imgList .keyAt(imgList.indexOfValue(imgList.get(poemImagePager.getCurrentItem() + 1))); Crashlytics.setString(App.CRASHLYTICS_KEY_POEM_TEXT, poemText); Crashlytics.setInt(App.CRASHLYTICS_KEY_POEM_IMAGE, poemImage); AppService.createPoem(getApplicationContext(), poemText, poemImage, poemTheme.getDisplayName(), dateFormat.format(Calendar.getInstance().getTime())); } else { Toast.makeText(getApplicationContext(), getResources().getString(R.string.toast_wordless_poem), Toast.LENGTH_SHORT).show(); Crashlytics.log("PoemBuilder: User tried to create poem without words on it"); } } @Override protected void onResume() { super.onResume(); final IntentFilter intentFilter = new IntentFilter(App.BROADCAST_POEM_CREATION); poemCreatedReceiver = new PoemCreatedReceiver(); LocalBroadcastManager.getInstance(this).registerReceiver(poemCreatedReceiver, intentFilter); } @Override protected void onPause() { super.onPause(); LocalBroadcastManager.getInstance(this).unregisterReceiver(poemCreatedReceiver); } class PoemCreatedReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getBooleanExtra(App.BROADCAST_POEM_CREATION_RESULT, false)) { Crashlytics.log("PoemBuilder: poem saved, receiver called"); Toast.makeText(getApplicationContext(), getResources().getString(R.string.toast_poem_created), Toast.LENGTH_SHORT).show(); final Intent i = new Intent(getApplicationContext(), PoemHistoryActivity.class); i.putExtra(ThemeChooserActivity.IS_NEW_POEM, true); startActivity(i); } else { Crashlytics.log("PoemBuilder: error when saving poem"); Toast.makeText(getApplicationContext(), getResources().getString(R.string.toast_poem_error), Toast.LENGTH_SHORT).show(); finish(); } } } private void shuffleWords() { wordsContainer.removeAllViews(); final List<String> wordList = wordBank.loadWords(); for (String w : wordList) { final TextView wordView = (TextView) getLayoutInflater().inflate(R.layout.word, null, true); wordView.setText(w); wordView.setOnTouchListener(new WordTouchListener()); wordView.setTag(w); wordsContainer.addView(wordView); } Crashlytics.setInt(App.CRASHLYTICS_KEY_WORDBANK_COUNT, wordList.size()); } private String getPoemText() { final StringBuilder sb = new StringBuilder(); for (int i = 0; i < poemContainer.getChildCount(); i++) { final CharSequence word = ((TextView) poemContainer.getChildAt(i)).getText(); if (!suffixes.contains(word) && i != 0) sb.append(" "); sb.append(word); } return sb.toString(); } final class ImageTouchListener implements View.OnTouchListener { @Override public boolean onTouch(View v, MotionEvent event) { poemImagePager.onTouchEvent(event); return true; } } private CountDownTimer createCountdown(long remainingSeconds) { countdownView.setCurrentTime(remainingSeconds); return new CountDownTimer(remainingSeconds * 1000, 1000) { public void onTick(long millisUntilFinished) { final long secsToFinish = millisUntilFinished / 1000; if (secsToFinish == 10) { countdownText.setTextColor(getResources().getColor(R.color.red_font)); countdownView.setColor(getResources().getColor(R.color.red_font)); shuffleText.setTextColor(getResources().getColor(R.color.red_font)); } countdownText.setText("" + secsToFinish); countdownView.setCurrentTime(secsToFinish); Crashlytics.setLong(App.CRASHLYTICS_KEY_COUNTDOWN, secsToFinish); } public void onFinish() { Crashlytics.log("PoemBuilder: countdown timer ended, saving poem..."); if (poemContainer.getChildCount() > 0) { createPoem(); } else { Crashlytics.log("PoemBuilder: Countdown finishes counting, no words added"); onBackPressed(); } } }.start(); } private final class WordTouchListener implements View.OnTouchListener { public boolean onTouch(View view, MotionEvent motionEvent) { if (motionEvent.getAction() == MotionEvent.ACTION_DOWN && motionEvent.getPointerId(0) == 0) { // the getPointerId is to avoid executing something if someone decides to drag with // 2 fingers final ClipData data = ClipData.newPlainText("word", (String) view.getTag()); final View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view); view.startDrag(data, shadowBuilder, view, 0); view.setVisibility(View.GONE); return true; } else if (motionEvent.getAction() == MotionEvent.ACTION_UP) { // it is a tap, if the touch was quick enough to cancel the execution // of ACTION_DOWN, we should consider as a tap too. final FlowLayout parent = (FlowLayout) view.getParent(); if (parent.getId() == R.id.words_container) { moveView(wordsContainer, poemContainer, view); } else { moveView(poemContainer, wordsContainer, view); } return true; } else { return false; } } } class PanelDragListener implements View.OnDragListener { private static final int TAP_RANGE = 200; private long dragStartedAt; private int finalPosition; private ArrayList<TextView> words = new ArrayList<TextView>(); @Override public boolean onDrag(View v, DragEvent event) { final int action = event.getAction(); switch (action) { case DragEvent.ACTION_DRAG_STARTED: // Determines if this View can accept the dragged data // Called on all views that has this listener set final ClipDescription clipDescription = event.getClipDescription(); if (clipDescription.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) { dragStartedAt = System.currentTimeMillis(); words.clear(); return true; } return false; case DragEvent.ACTION_DRAG_ENTERED: return true; case DragEvent.ACTION_DRAG_LOCATION: if (words.size() == 0) fillWordsList((FlowLayout) v); finalPosition = pointToWordIndex(event.getX(), event.getY()); if (PLACEHOLDER_POSITION != finalPosition) { final ViewGroup parent = (ViewGroup) placeholder.getParent(); if (parent != null) parent.removeView(placeholder); ((FlowLayout) v).addView(placeholder, finalPosition); placeholder.setVisibility(View.VISIBLE); } return true; case DragEvent.ACTION_DRAG_EXITED: return true; case DragEvent.ACTION_DROP: // Called on the view that received the drop final View word = (View) event.getLocalState(); final FlowLayout from = (FlowLayout) word.getParent(); FlowLayout to = (FlowLayout) v; if (System.currentTimeMillis() - dragStartedAt > TAP_RANGE) { // it was a drag if (finalPosition >= words.size()) { moveView(from, to, word); } else { moveView(from, to, word, finalPosition); } } else { // it is a tap final int viewId; if (areCrashesEnabled) { // Crashlytics: // To generate the crash, open the app and drag a word really quick // from the Word Bank to the Poem (in less than TAP_RANGE ms) viewId = to.getId(); Crashlytics.log("PoemBuilder: An enabled crash will execute"); } else { viewId = from.getId(); } if (viewId == R.id.words_container) { to = poemContainer; moveView(wordsContainer, poemContainer, word); } else { to = wordsContainer; moveView(poemContainer, wordsContainer, word); } } // change word color if it is on poem container or wordscontainer if (to.equals(poemContainer)) { word.setBackgroundResource(R.drawable.word_at_poem); ((TextView) word).setTextColor(getResources().getColor(R.color.white)); word.invalidate(); } else if (to.equals(wordsContainer)) { word.setBackgroundResource(R.drawable.word); ((TextView) word).setTextColor(getResources().getColor(R.color.green)); word.invalidate(); } final ViewGroup parent = (ViewGroup) placeholder.getParent(); if (parent != null) parent.removeView(placeholder); placeholder.setVisibility(View.GONE); return true; case DragEvent.ACTION_DRAG_ENDED: // Called on all views that has this listener set if (!event.getResult()) { // what to do if the view is dropped in the wrong place final View localState = (View) event.getLocalState(); localState.setVisibility(View.VISIBLE); final ViewGroup placeholderParent = (ViewGroup) placeholder.getParent(); if (placeholderParent != null) placeholderParent.removeView(placeholder); placeholder.setVisibility(View.GONE); } return true; default: break; } return false; } private void fillWordsList(FlowLayout view) { for (int i = 0; i < view.getChildCount(); i++) { final TextView word = (TextView) view.getChildAt(i); if (word.getTag() instanceof String) words.add(word); } } private Integer pointToWordIndex(float x, float y) { float startX = 0; boolean reachedY = false; final int count = words.size(); // Margin top and bottom between words, see flowlayout final int space = getResources().getDimensionPixelSize(R.dimen.word_padding_vertical); for (int i = 0; i < count; i++) { final TextView word = words.get(i); final float wordX = word.getLeft(); final float wordY = word.getTop(); if (y > wordY - space && y < (wordY + word.getHeight() + space)) { if (x > startX && x < (wordX + Math.round(word.getWidth() / 2))) { return i; } startX = (wordX + (word.getWidth() / 2)); reachedY = true; } else if (reachedY) { return i; } } return count; } } private void moveView(ViewGroup from, ViewGroup to, View object) { from.removeView(object); to.addView(object); object.setVisibility(View.VISIBLE); onWordMoved(); } private void moveView(ViewGroup from, ViewGroup to, View object, int position) { from.removeView(object); to.addView(object, position); object.setVisibility(View.VISIBLE); onWordMoved(); } private void onWordMoved() { if (poemContainer.getChildCount() > 0) { tick.setColorFilter(getResources().getColor(R.color.green)); } else { tick.setColorFilter(getResources().getColor(R.color.grayish_blue)); } } }