ListView + CheckBox implements full and inverse selection, listviewcheckbox

ListView + CheckBox implements full and inverse selection, listviewcheckbox

The implementation is as follows: (in the example of the first line of code modified). When you click Select All, the effect is as follows:

Select only the following:

Press and select inverse,

First, layout:

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: layout_width = "match_parent" android: layout_height = "match_parent" android: background = "# f2f0eb" android: orientation = "vertical"> <FrameLayout android: layout_width = "match_parent" android: layout_height = "match_parent" android: layout_weight = "50"> <ListView android: id = "@ + id/list_view" android: layout_width = "match_parent" android: layout_height = "match_parent" android: background = "@ android: color/transparent" android: cacheColorHint = "#00000000" android: divider = "# D4D4D4" android: dividerHeight = "1px" android: fastScrollEnabled = "true" android: overScrollMode = "never"/> </FrameLayout> <LinearLayout android: layout_width = "match_parent" android: layout_height = "wrap_content" android: orientation = "horizontal"> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_marginBottom = "10dip" android: layout_marginLeft = "5dp" android: layout_marginRight = "5dip" android: layout_marginTop = "10dp" android: layout_weight = "1" android: background = "@ drawable/button_register_bg" android: gravity = "center" android: onClick = "selectAll" android: paddingBottom = "7dp" android: paddingTop = "7dp" android: text = "select all" android: textColor = "@ android: color/white" android: textSize = "18sp"/> <Button android: layout_width = "0dp" android: layout_height = "wrap_content" android: layout_marginBottom = "10dip" android: layout_marginLeft = "5dp" android: layout_marginRight = "5dip" android: layout_marginTop = "10dp" android: layout_weight = "1" android: background = "@ drawable/button_login_bg" android: gravity = "center" android: onClick = "selectOppo" android: paddingBottom = "7dp" android: paddingTop = "7dp" android: text = "invert" android: textColor = "@ android: color/white" android: textSize = "18sp"/> </LinearLayout>

Note that ListView is nested in FrameLayout and the layout_weight attribute is specified (otherwise, the following two buttons are hidden .)

In MainActivity:

public void selectAll(View view){for(Fruit fruit : fruitList){fruit.setChecked(true);}adapter.notifyDataSetChanged();}public void selectOppo(View view){for(Fruit fruit : fruitList){fruit.setChecked(!fruit.isChecked());}adapter.notifyDataSetChanged();}

This is done.

Complete code:

MainActivity:

package com.example.uilistviewtest;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.Toast;import com.example.uilistviewtest.FruitAdapter.ViewHolder;public class MainActivity extends Activity {private List<Fruit> fruitList = new ArrayList<Fruit>();private FruitAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initFruits();adapter = new FruitAdapter(MainActivity.this,R.layout.fruit_item, fruitList);ListView listView = (ListView) findViewById(R.id.list_view);listView.setAdapter(adapter);listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {Fruit fruit = fruitList.get(position);ViewHolder holder = (ViewHolder) view.getTag();if (fruit.isChecked()) {fruit.setChecked(false);holder.cb.setChecked(false);} else {fruit.setChecked(true);holder.cb.setChecked(true);}Toast.makeText(MainActivity.this, fruit.getName(),Toast.LENGTH_SHORT).show();}});}public void selectAll(View view){for(Fruit fruit : fruitList){fruit.setChecked(true);}adapter.notifyDataSetChanged();}public void selectOppo(View view){for(Fruit fruit : fruitList){fruit.setChecked(!fruit.isChecked());}adapter.notifyDataSetChanged();}private void initFruits() {Fruit apple = new Fruit("Apple", R.drawable.apple_pic);fruitList.add(apple);Fruit banana = new Fruit("Banana", R.drawable.banana_pic);fruitList.add(banana);Fruit orange = new Fruit("Orange", R.drawable.orange_pic);fruitList.add(orange);Fruit watermelon = new Fruit("Watermelon", R.drawable.watermelon_pic);fruitList.add(watermelon);Fruit pear = new Fruit("Pear", R.drawable.pear_pic);fruitList.add(pear);Fruit grape = new Fruit("Grape", R.drawable.grape_pic);fruitList.add(grape);Fruit pineapple = new Fruit("Pineapple", R.drawable.pineapple_pic);fruitList.add(pineapple);Fruit strawberry = new Fruit("Strawberry", R.drawable.strawberry_pic);fruitList.add(strawberry);Fruit cherry = new Fruit("Cherry", R.drawable.cherry_pic);fruitList.add(cherry);for (int i = 0; i < 10; i++) {Fruit mango = new Fruit("Mango", R.drawable.mango_pic);fruitList.add(mango);}}}

Fruit business bean class:

package com.example.uilistviewtest;public class Fruit {private String name;private int imageId;private boolean checked;public Fruit(String name, int imageId) {this.name = name;this.imageId = imageId;}public String getName() {return name;}public int getImageId() {return imageId;}public boolean isChecked() {return checked;}public void setChecked(boolean checked) {this.checked = checked;}}

Adapter:

package com.example.uilistviewtest;import java.util.List;import android.content.Context;import android.support.v4.widget.CursorAdapter;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.SimpleAdapter;import android.widget.TextView;public class FruitAdapter extends ArrayAdapter<Fruit> {private int resourceId;public FruitAdapter(Context context, int textViewResourceId,List<Fruit> objects) {super(context, textViewResourceId, objects);resourceId = textViewResourceId;}CursorAdapter ca;@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Fruit fruit = getItem(position);View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.fruitImage = (ImageView) view.findViewById(R.id.fruit_image);viewHolder.fruitName = (TextView) view.findViewById(R.id.fruit_name);viewHolder.cb = (CheckBox) view.findViewById(R.id.cb);view.setTag(viewHolder);} else {view = convertView;viewHolder = (ViewHolder) view.getTag();}viewHolder.fruitImage.setImageResource(fruit.getImageId());viewHolder.fruitName.setText(fruit.getName());viewHolder.cb.setChecked(fruit.isChecked());return view;}class ViewHolder {ImageView fruitImage;TextView fruitName;CheckBox cb;}}