ListPickerActivity.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2018 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime;
 
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import com.google.appinventor.components.runtime.util.AnimationUtil;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.inputmethod.InputMethodManager;
 
 
public class ListPickerActivity extends AppInventorCompatActivity implements AdapterView.OnItemClickListener {
 
  private String closeAnim = "";
  private ListView listView;
 
  // Listview Adapter
  MyAdapter adapter;
 
  // Search EditText
  EditText txtSearchBox;
 
  static int itemColor;
  static int backgroundColor;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 
    styleTitleBar();
 
    LinearLayout viewLayout = new LinearLayout(this);
    viewLayout.setOrientation(LinearLayout.VERTICAL);
 
    Intent myIntent = getIntent();
    if (myIntent.hasExtra(ListPicker.LIST_ACTIVITY_ANIM_TYPE)) {
      closeAnim = myIntent.getStringExtra(ListPicker.LIST_ACTIVITY_ANIM_TYPE);
    }
    if (myIntent.hasExtra(ListPicker.LIST_ACTIVITY_ORIENTATION_TYPE)) {
      String orientation = myIntent.getStringExtra(ListPicker.LIST_ACTIVITY_ORIENTATION_TYPE).toLowerCase();
      if (orientation.equals("portrait")) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
      }
      else if (orientation.equals("landscape")) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
      }
    }
 
    if (myIntent.hasExtra(ListPicker.LIST_ACTIVITY_TITLE)) {
      String title = myIntent.getStringExtra(ListPicker.LIST_ACTIVITY_TITLE);
      setTitle(title);
    }
    if (myIntent.hasExtra(ListPicker.LIST_ACTIVITY_ARG_NAME)) {
      String items[] = getIntent().getStringArrayExtra(ListPicker.LIST_ACTIVITY_ARG_NAME);
      listView = new ListView(this);
      listView.setOnItemClickListener(this);
      listView.setScrollingCacheEnabled(false);
 
      itemColor = myIntent.getIntExtra(ListPicker.LIST_ACTIVITY_ITEM_TEXT_COLOR, ListPicker.DEFAULT_ITEM_TEXT_COLOR);
      backgroundColor = myIntent.getIntExtra(ListPicker.LIST_ACTIVITY_BACKGROUND_COLOR, ListPicker.DEFAULT_ITEM_BACKGROUND_COLOR);
 
      viewLayout.setBackgroundColor(backgroundColor);
 
      // Adding items to listview
      adapter = new MyAdapter(this, items);
      listView.setAdapter(adapter);
      String showFilterBar =myIntent.getStringExtra(ListPicker.LIST_ACTIVITY_SHOW_SEARCH_BAR);
 
      // Determine if we should even show the search bar
      txtSearchBox = new EditText(this);
      txtSearchBox.setSingleLine(true);
      txtSearchBox.setWidth(Component.LENGTH_FILL_PARENT);
      txtSearchBox.setPadding(10, 10, 10, 10);
      txtSearchBox.setHint("Search list...");
      if (!isClassicMode()) {
        txtSearchBox.setBackgroundColor(Color.WHITE);
      }
 
      if (showFilterBar == null || !showFilterBar.equalsIgnoreCase("true")) {
        txtSearchBox.setVisibility(View.GONE);
      }
 
      //set up the listener
      txtSearchBox.addTextChangedListener(new TextWatcher() {
 
        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
          // When user changed the Text
          ListPickerActivity.this.adapter.getFilter().filter(cs);
        }
 
        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
          // no-op. Required method
        }
 
        @Override
        public void afterTextChanged(Editable arg0) {
            // no-op. Required method
        }
      });
 
    }
    else {
      setResult(RESULT_CANCELED);
      finish();
      AnimationUtil.ApplyCloseScreenAnimation(this, closeAnim);
    }
    viewLayout.addView(txtSearchBox);
    viewLayout.addView(listView);
 
    this.setContentView(viewLayout);
    viewLayout.requestLayout();
 
    //hide the keyboard
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(getWindow().getDecorView().getWindowToken(), 0);
    getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
  }
 
  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    String selected = (String) parent.getAdapter().getItem(position);
    Intent resultIntent = new Intent();
    resultIntent.putExtra(ListPicker.LIST_ACTIVITY_RESULT_NAME, selected);
    resultIntent.putExtra(ListPicker.LIST_ACTIVITY_RESULT_INDEX, position + 1);
    closeAnim = selected;
    setResult(RESULT_OK, resultIntent);
    finish();
    AnimationUtil.ApplyCloseScreenAnimation(this, closeAnim);
  }
 
  // Capture the hardware back button to make sure the screen animation
  // still applies.
  @Override
  public void onBackPressed() {
    AnimationUtil.ApplyCloseScreenAnimation(this, closeAnim);
    super.onBackPressed();
  }
 
 
  private static class MyAdapter extends ArrayAdapter<String> {
 
    private final Context mContext;
 
    public MyAdapter(final Context context, final String[] items) {
      super(context, android.R.layout.activity_list_item, items);
      mContext = context;
    }
 
    @Override
    public long getItemId(final int position) {
      return getItem(position).hashCode();
    }
 
    @Override
    public View getView(final int position, final View convertView, final ViewGroup parent) {
      TextView tv = (TextView) convertView;
      if (tv == null) {
        tv = (TextView) LayoutInflater.from(mContext).inflate(android.R.layout.simple_list_item_1, parent, false);
      }
      tv.setText(getItem(position));
      tv.setTextColor(itemColor);
      return tv;
    }
  }
}