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.ContentValues; import android.content.Context; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.app.ActionBarActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.support.v7.widget.Toolbar; import android.text.Html; import android.util.Log; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.ProgressBar; import com.afollestad.materialdialogs.MaterialDialog; import com.android.volley.DefaultRetryPolicy; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.JsonArrayRequest; import com.android.volley.toolbox.JsonObjectRequest; import com.android.volley.toolbox.Volley; import org.json.JSONArray; import org.json.JSONObject; import java.net.URLEncoder; public class ClinicalTrialsCardsActivity extends ActionBarActivity { private final Context mContext = this; private final MyTools mTools = new MyTools(mContext); private Toolbar mToolbar; private ProgressBar mProgressBar; private SwipeRefreshLayout mSwipeRefreshLayout; private RecyclerView mRecyclerView; private LinearLayout mNoClinicalTrialsLayout; private String searchString; // Create activity @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Connected? if (!mTools.isDeviceConnected()) { mTools.showToast(getString(R.string.device_not_connected), 1); finish(); return; } // Intent final Intent intent = getIntent(); searchString = intent.getStringExtra("search"); // Layout setContentView(R.layout.activity_clinicaltrials_cards); // Toolbar mToolbar = (Toolbar) findViewById(R.id.clinicaltrials_cards_toolbar); mToolbar.setTitle(getString(R.string.clinicaltrials_cards_search) + ": \"" + searchString + "\""); setSupportActionBar(mToolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); // Progress bar mProgressBar = (ProgressBar) findViewById(R.id.clinicaltrials_cards_toolbar_progressbar); mProgressBar.setVisibility(View.VISIBLE); // Refresh mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.clinicaltrials_cards_swipe_refresh_layout); mSwipeRefreshLayout.setColorSchemeResources(R.color.accent_blue, R.color.accent_green, R.color.accent_purple, R.color.accent_orange); mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { search(searchString, false); } }); // Recycler view mRecyclerView = (RecyclerView) findViewById(R.id.clinicaltrials_cards_cards); mRecyclerView.setHasFixedSize(true); mRecyclerView.setAdapter(new ClinicalTrialsCardsAdapter(mContext, new JSONArray())); mRecyclerView.setLayoutManager(new LinearLayoutManager(mContext)); // No clinical trials mNoClinicalTrialsLayout = (LinearLayout) findViewById(R.id.clinicaltrials_cards_no_clinicaltrials); Button noClinicalTrialsButton = (Button) findViewById(R.id.clinicaltrials_cards_no_results_button); noClinicalTrialsButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { try { Intent intent = new Intent(mContext, MainWebViewActivity.class); intent.putExtra("title", getString(R.string.clinicaltrials_cards_search) + ": \"" + searchString + "\""); intent.putExtra("uri", "https://clinicaltrials.gov/ct2/results?term=" + URLEncoder.encode(searchString.toLowerCase(), "utf-8") + "&no_unk=Y"); mContext.startActivity(intent); } catch (Exception e) { Log.e("ClinicalTrialsCards", Log.getStackTraceString(e)); } } }); // Search search(searchString, true); // Correct RequestQueue requestQueue = Volley.newRequestQueue(mContext); try { JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, getString(R.string.project_website_uri) + "api/1/correct/?search=" + URLEncoder.encode(searchString, "utf-8"), new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { try { final String correctSearchString = response.getString("correct"); if (!correctSearchString.equals("")) { new MaterialDialog.Builder(mContext) .title(getString(R.string.correct_dialog_title)) .content(Html.fromHtml(getString(R.string.correct_dialog_message) + ":<br><br><b>" + correctSearchString + "</b>")) .positiveText(getString(R.string.correct_dialog_positive_button)) .negativeText(getString(R.string.correct_dialog_negative_button)) .callback(new MaterialDialog.ButtonCallback() { @Override public void onPositive(MaterialDialog dialog) { ContentValues contentValues = new ContentValues(); contentValues.put(ClinicalTrialsSQLiteHelper.COLUMN_STRING, correctSearchString); SQLiteDatabase sqLiteDatabase = new ClinicalTrialsSQLiteHelper( mContext).getWritableDatabase(); sqLiteDatabase.delete(ClinicalTrialsSQLiteHelper.TABLE, ClinicalTrialsSQLiteHelper.COLUMN_STRING + " = " + mTools.sqe(searchString) + " COLLATE NOCASE", null); sqLiteDatabase.insert(ClinicalTrialsSQLiteHelper.TABLE, null, contentValues); sqLiteDatabase.close(); mToolbar.setTitle( getString(R.string.clinicaltrials_cards_search) + ": \"" + correctSearchString + "\""); mProgressBar.setVisibility(View.VISIBLE); mNoClinicalTrialsLayout.setVisibility(View.GONE); mSwipeRefreshLayout.setVisibility(View.VISIBLE); search(correctSearchString, true); } }).contentColorRes(R.color.black).positiveColorRes(R.color.dark_blue) .negativeColorRes(R.color.black).show(); } } catch (Exception e) { Log.e("ClinicalTrialsCards", Log.getStackTraceString(e)); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e("ClinicalTrialsCards", error.toString()); } }); jsonObjectRequest.setRetryPolicy(new DefaultRetryPolicy(10000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); requestQueue.add(jsonObjectRequest); } catch (Exception e) { Log.e("ClinicalTrialsCards", Log.getStackTraceString(e)); } } // Menu @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: { NavUtils.navigateUpFromSameTask(this); return true; } default: { return super.onOptionsItemSelected(item); } } } // Search private void search(final String string, boolean cache) { try { RequestQueue requestQueue = Volley.newRequestQueue(mContext); String apiUri = getString(R.string.project_website_uri) + "api/1/clinicaltrials/?search=" + URLEncoder.encode(string.toLowerCase(), "utf-8"); if (!cache) requestQueue.getCache().remove(apiUri); JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(apiUri, new Response.Listener<JSONArray>() { @Override public void onResponse(JSONArray response) { mProgressBar.setVisibility(View.GONE); mSwipeRefreshLayout.setRefreshing(false); if (response.length() == 0) { mSwipeRefreshLayout.setVisibility(View.GONE); mNoClinicalTrialsLayout.setVisibility(View.VISIBLE); } else { if (mTools.isTablet()) { int spanCount = (response.length() == 1) ? 1 : 2; mRecyclerView.setLayoutManager( new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.VERTICAL)); } mRecyclerView.setAdapter(new ClinicalTrialsCardsAdapter(mContext, response)); ContentValues contentValues = new ContentValues(); contentValues.put(ClinicalTrialsSQLiteHelper.COLUMN_STRING, string); SQLiteDatabase sqLiteDatabase = new ClinicalTrialsSQLiteHelper(mContext) .getWritableDatabase(); sqLiteDatabase.delete(ClinicalTrialsSQLiteHelper.TABLE, ClinicalTrialsSQLiteHelper.COLUMN_STRING + " = " + mTools.sqe(string) + " COLLATE NOCASE", null); sqLiteDatabase.insert(ClinicalTrialsSQLiteHelper.TABLE, null, contentValues); sqLiteDatabase.close(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { mProgressBar.setVisibility(View.GONE); mSwipeRefreshLayout.setRefreshing(false); mTools.showToast(getString(R.string.clinicaltrials_cards_something_went_wrong), 1); finish(); Log.e("ClinicalTrialsCards", error.toString()); } }); jsonArrayRequest.setRetryPolicy(new DefaultRetryPolicy(30000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); requestQueue.add(jsonArrayRequest); } catch (Exception e) { Log.e("ClinicalTrialsCards", Log.getStackTraceString(e)); } } }