สร้างตามนี้ก่อน การใช้ ViewHolder ร่วมกับ Custom ListView แล้วแก้ไข 4 ไฟล์นี้
ViewHolder.java
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package com.phaisarn.myapplication; import android.view.View; import android.widget.CheckBox; import android.widget.ImageView; import android.widget.TextView; public class ViewHolder { public ImageView imageView; public TextView textViewTitle; public TextView textViewContent; public CheckBox checkBox; public ViewHolder(View convertView) { imageView = (ImageView)convertView.findViewById(R.id.imageView); textViewTitle = (TextView)convertView.findViewById(R.id.textViewTitle); textViewContent = (TextView)convertView.findViewById(R.id.textViewContent); checkBox = (CheckBox)convertView.findViewById(R.id.checkbox); } } |
CustomAdapter.java
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package com.phaisarn.myapplication; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.CheckBox; import java.util.ArrayList; public class CustomAdapter extends ArrayAdapter { private Context mContext; private ArrayList<CustomItem> mItems; public CustomAdapter(Context context, ArrayList<CustomItem> items) { super(context, 0, items); mContext = context; mItems = items; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder vHolder; if(convertView == null) { LayoutInflater inflater = LayoutInflater.from(mContext); convertView = inflater.inflate(R.layout.custom_layout, parent, false); vHolder = new ViewHolder(convertView); convertView.setTag(vHolder); } else { vHolder = (ViewHolder)convertView.getTag(); } final CustomItem item = mItems.get(position); vHolder.imageView.setImageResource(item.imgId); vHolder.textViewTitle.setText(item.title); vHolder.textViewContent.setText(item.content); vHolder.checkBox.setChecked(item.isChecked); vHolder.checkBox.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { CheckBox cbx = (CheckBox)view; item.isChecked = cbx.isChecked(); } }); return convertView; } } |
CustomItem.java
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package com.phaisarn.myapplication; public class CustomItem { public int imgId; public String title; public String content; public boolean isChecked; public CustomItem(int imgId, String title, String content, boolean isChecked) { this.imgId = imgId; this.title = title; this.content = content; this.isChecked = isChecked; } } |
MainActivity.java
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package com.phaisarn.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.widget.ListView; import android.view.View; import android.widget.AdapterView; import android.widget.Toast; import java.util.ArrayList; import java.util.Arrays; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); /* FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); */ final ArrayList<CustomItem> itemArray = new ArrayList<>(); itemArray.addAll(Arrays.asList( new CustomItem(R.drawable.ic_1, "One", "รายการที่ 1", false), new CustomItem(R.drawable.ic_2, "Two", "รายการที่ 2", true), new CustomItem(R.drawable.ic_3, "Three", "รายการที่ 3", false), new CustomItem(R.drawable.ic_4, "Four", "รายการที่ 4", false), new CustomItem(R.drawable.ic_5, "Five", "รายการที่ 5", true))); CustomAdapter adapter = new CustomAdapter(getBaseContext(), itemArray); ListView listView = (ListView) findViewById(R.id.listView); listView.setAdapter(adapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { CustomItem item = itemArray.get(i); String str = "Title: " + item.title + "\n"; str += "Content: " + item.content + "\n"; str += "Checked: " + (item.isChecked ? "true" : "false"); Toast.makeText(getBaseContext(), str, Toast.LENGTH_SHORT).show(); } }); } @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); 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.action_settings) { return true; } return super.onOptionsItemSelected(item); } } |