Java tutorial
package org.rudirect.android.activity; import android.os.Bundle; import android.support.v4.content.res.ResourcesCompat; import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.text.Html; import android.text.SpannableStringBuilder; import android.util.Log; import android.view.MenuItem; import android.widget.TextView; import com.google.android.gms.analytics.HitBuilders; import com.google.android.gms.common.GoogleApiAvailability; import org.rudirect.android.R; import org.rudirect.android.data.constants.RUDirectApplication; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class AttributionsActivity extends AppCompatActivity { private static final String TAG = AttributionsActivity.class.getSimpleName(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_attributions); // Setup the toolbar Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeAsUpIndicator( ResourcesCompat.getDrawable(getResources(), R.drawable.ic_action_toolbar_back, getTheme())); } // Build attributions text and set it to the textview text TextView attrTextView = (TextView) findViewById(R.id.attributions_textview); if (attrTextView != null) attrTextView.setText(getAttributionsMessage()); // Log the screen RUDirectApplication.getTracker().setScreenName(getString(R.string.attributions_screen)); RUDirectApplication.getTracker().send(new HitBuilders.ScreenViewBuilder().build()); } // Builds the attributions message and returns it private SpannableStringBuilder getAttributionsMessage() { try { String googlePlayLicense = GoogleApiAvailability.getInstance().getOpenSourceSoftwareLicenseInfo(this); return new SpannableStringBuilder(Html.fromHtml("<h4>Google Play Services</h4>")) .append(googlePlayLicense).append("\n") .append(Html.fromHtml(convertStreamToString(getAssets().open("open_source_software.html")))); } catch (IOException e) { Log.e(TAG, e.toString(), e); return null; } } // Convert input stream to string private String convertStreamToString(InputStream is) { BufferedReader reader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line; try { while ((line = reader.readLine()) != null) { sb.append(line).append('\n'); } } catch (IOException e) { e.printStackTrace(); } finally { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == android.R.id.home) { onBackPressed(); return true; } return super.onOptionsItemSelected(item); } }