Java tutorial
package net.olejon.mdapp; /* Copyright 2015 Ole Jon Bjrkum This file is part of LegeAppen. LegeAppen is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. LegeAppen is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with LegeAppen. If not, see <http://www.gnu.org/licenses/>. */ import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.speech.RecognizerIntent; import android.support.annotation.NonNull; import android.support.v4.app.NavUtils; import android.support.v7.app.ActionBarActivity; import android.support.v7.widget.Toolbar; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.view.inputmethod.EditorInfo; import android.view.inputmethod.InputMethodManager; import android.widget.AdapterView; import android.widget.EditText; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.TextView; import com.afollestad.materialdialogs.MaterialDialog; import com.melnykov.fab.FloatingActionButton; import java.util.ArrayList; public class ClinicalTrialsActivity extends ActionBarActivity { private static final int VOICE_SEARCH_REQUEST_CODE = 1; private final Context mContext = this; private final MyTools mTools = new MyTools(mContext); private SQLiteDatabase mSqLiteDatabase; private Cursor mCursor; private InputMethodManager mInputMethodManager; private LinearLayout mToolbarSearchLayout; private EditText mToolbarSearchEditText; private FloatingActionButton mFloatingActionButton; private ListView mListView; private boolean mActivityPaused = false; // Create activity @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Input manager mInputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); // Layout setContentView(R.layout.activity_clinicaltrials); // Toolbar final Toolbar toolbar = (Toolbar) findViewById(R.id.clinicaltrials_toolbar); toolbar.setTitle(getString(R.string.clinicaltrials_title)); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); mToolbarSearchLayout = (LinearLayout) findViewById(R.id.clinicaltrials_toolbar_search_layout); mToolbarSearchEditText = (EditText) findViewById(R.id.clinicaltrials_toolbar_search); mToolbarSearchEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) { if (i == EditorInfo.IME_ACTION_SEARCH || keyEvent.getKeyCode() == KeyEvent.KEYCODE_ENTER) { mInputMethodManager.hideSoftInputFromWindow(mToolbarSearchEditText.getWindowToken(), 0); search(mToolbarSearchEditText.getText().toString().trim()); return true; } return false; } }); ImageButton imageButton = (ImageButton) findViewById(R.id.clinicaltrials_toolbar_clear_search); imageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mToolbarSearchEditText.setText(""); } }); // List mListView = (ListView) findViewById(R.id.clinicaltrials_list); View listViewEmpty = findViewById(R.id.clinicaltrials_list_empty); mListView.setEmptyView(listViewEmpty); View listViewHeader = getLayoutInflater().inflate(R.layout.activity_clinicaltrials_list_subheader, mListView, false); mListView.addHeaderView(listViewHeader, null, false); // Floating action button mFloatingActionButton = (FloatingActionButton) findViewById(R.id.clinicaltrials_fab); mFloatingActionButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mToolbarSearchLayout.getVisibility() == View.VISIBLE) { mInputMethodManager.hideSoftInputFromWindow(mToolbarSearchEditText.getWindowToken(), 0); search(mToolbarSearchEditText.getText().toString().trim()); } else { mToolbarSearchLayout.setVisibility(View.VISIBLE); mToolbarSearchEditText.requestFocus(); mInputMethodManager.showSoftInput(mToolbarSearchEditText, 0); } } }); } // Activity result @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == VOICE_SEARCH_REQUEST_CODE && data != null) { ArrayList<String> voiceSearchArrayList = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); String voiceSearchString = voiceSearchArrayList.get(0); search(voiceSearchString); } } // Resume activity @Override protected void onResume() { super.onResume(); getRecentSearches(); } // Pause activity @Override protected void onPause() { super.onPause(); mActivityPaused = true; } // Destroy activity @Override protected void onDestroy() { super.onDestroy(); if (mCursor != null && !mCursor.isClosed()) mCursor.close(); if (mSqLiteDatabase != null && mSqLiteDatabase.isOpen()) mSqLiteDatabase.close(); } // Back button @Override public void onBackPressed() { if (mToolbarSearchLayout.getVisibility() == View.VISIBLE) { mToolbarSearchLayout.setVisibility(View.GONE); mToolbarSearchEditText.setText(""); } else { super.onBackPressed(); } } // Search button @Override public boolean onKeyUp(int keyCode, @NonNull KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_SEARCH) { mToolbarSearchLayout.setVisibility(View.VISIBLE); mToolbarSearchEditText.requestFocus(); mInputMethodManager.showSoftInput(mToolbarSearchEditText, 0); return true; } return super.onKeyUp(keyCode, event); } // Menu @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_clinicaltrials, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: { NavUtils.navigateUpFromSameTask(this); return true; } case R.id.clinicaltrials_menu_voice_search: { try { Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, "en-US"); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); startActivityForResult(intent, VOICE_SEARCH_REQUEST_CODE); } catch (Exception e) { new MaterialDialog.Builder(mContext).title(getString(R.string.device_not_supported_dialog_title)) .content(getString(R.string.device_not_supported_dialog_message)) .positiveText(getString(R.string.device_not_supported_dialog_positive_button)) .contentColorRes(R.color.black).positiveColorRes(R.color.dark_blue).show(); } return true; } case R.id.clinicaltrials_menu_clear_recent_searches: { clearRecentSearches(); return true; } default: { return super.onOptionsItemSelected(item); } } } // Search private void search(String string) { if (string.equals("")) return; Intent intent = new Intent(mContext, ClinicalTrialsCardsActivity.class); intent.putExtra("search", string); startActivity(intent); } private void getRecentSearches() { GetRecentSearchesTask getRecentSearchesTask = new GetRecentSearchesTask(); getRecentSearchesTask.execute(); } private void clearRecentSearches() { mSqLiteDatabase.delete(ClinicalTrialsSQLiteHelper.TABLE, null, null); mTools.showToast(getString(R.string.clinicaltrials_recent_searches_removed), 0); getRecentSearches(); } private class GetRecentSearchesTask extends AsyncTask<Void, Void, SimpleCursorAdapter> { @Override protected void onPostExecute(SimpleCursorAdapter simpleCursorAdapter) { mListView.setAdapter(simpleCursorAdapter); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { int index = i - 1; if (mCursor.moveToPosition(index)) search(mCursor .getString(mCursor.getColumnIndexOrThrow(ClinicalTrialsSQLiteHelper.COLUMN_STRING)) .trim()); } }); Animation animation = AnimationUtils.loadAnimation(mContext, R.anim.fab); mFloatingActionButton.startAnimation(animation); mFloatingActionButton.setVisibility(View.VISIBLE); if (!mActivityPaused && mCursor.getCount() > 0) { Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { mToolbarSearchLayout.setVisibility(View.VISIBLE); mToolbarSearchEditText.requestFocus(); mInputMethodManager.showSoftInput(mToolbarSearchEditText, 0); } }, 500); } } @Override protected SimpleCursorAdapter doInBackground(Void... voids) { mSqLiteDatabase = new ClinicalTrialsSQLiteHelper(mContext).getWritableDatabase(); mCursor = mSqLiteDatabase.query(ClinicalTrialsSQLiteHelper.TABLE, null, null, null, null, null, ClinicalTrialsSQLiteHelper.COLUMN_ID + " DESC LIMIT 10"); String[] fromColumns = { ClinicalTrialsSQLiteHelper.COLUMN_STRING }; int[] toViews = { R.id.clinicaltrials_list_item_string }; return new SimpleCursorAdapter(mContext, R.layout.activity_clinicaltrials_list_item, mCursor, fromColumns, toViews, 0); } } }