Java tutorial
package com.pawnua.android.app.licenseplates; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.AppCompatTextView; import android.support.v7.widget.SearchView; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; public class MainActivity extends AppCompatActivity { //Defining Variables private Toolbar toolbar; ContentFragment_LicensePlate fragment; public LicensePlateAdapter adapterLicensePlate; private SearchView searchView; private int spinnerPosition = 0; MenuItem searchItem; Spinner spinner; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Initializing Toolbar and setting it as the actionbar toolbar = (Toolbar) findViewById(R.id.toolbar); toolbar.inflateMenu(R.menu.menu_main); setUpSpinner(); openframe_LicensePlate(); setSupportActionBar(toolbar); getSupportActionBar().setDisplayShowTitleEnabled(false); } private void setUpSpinner() { spinner = (Spinner) findViewById(R.id.spinner_nav); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { spinnerPosition = position; } @Override public void onNothingSelected(AdapterView<?> parent) { } }); ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(toolbar.getContext(), R.array.submenu_array, R.layout.spinner_dropdown_item); adapter.setDropDownViewResource(R.layout.spinner_dropdown_item); spinner.setAdapter(adapter); } private void openframe_LicensePlate() { fragment = new ContentFragment_LicensePlate(); android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager() .beginTransaction(); fragmentTransaction.replace(R.id.frame, fragment); fragmentTransaction.commit(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); searchItem = menu.findItem(R.id.search); searchView = (SearchView) searchItem.getActionView(); searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { @Override public boolean onQueryTextSubmit(String s) { return false; } @Override public boolean onQueryTextChange(String s) { adapterLicensePlate = fragment.adapter; if (adapterLicensePlate != null) { adapterLicensePlate.setSpinnerPosition(spinnerPosition); adapterLicensePlate.getFilter().filter(s); } ; return false; } }); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.search) { return true; } return super.onOptionsItemSelected(item); } }