android中listview学习与记录，简单文字列表、自定义列表、多布局、点击回调

于 2021-07-01 13:53:15 发布
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android中listview学习与记录，简单文字列表、自定义列表、多布局、点击回调

简单的文字列表

在这里插入图片描述

  • 布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
	xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>

</androidx.constraintlayout.widget.ConstraintLayout>
  • java文件
public class MainActivity extends AppCompatActivity {
    ListView listView;
    ArrayAdapter<String> arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.list);
        String[] strings = new String[3];
        strings[0] = "浙江省";
        strings[1] = "江苏省";
        strings[2] = "山东省";
        //ArrayAdapter三个参数为context，布局文件，数据数组
        arrayAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_expandable_list_item_1, strings);
        listView.setAdapter(arrayAdapter);
        //点击listview中的每一行事件，获取行号position进行处理
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, strings[position], Toast.LENGTH_SHORT).show();
            }
        });
    }

}

自定义布局列表

在这里插入图片描述

  • 布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
	xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>

</androidx.constraintlayout.widget.ConstraintLayout>
  • item文件
class NewItem {
    private String id;
    private String name;
    private Boolean status;

    public NewItem(String id, String name, Boolean status) {
        this.id = id;
        this.name = name;
        this.status = status;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Boolean getStatus() {
        return status;
    }

    public void setStatus(Boolean status) {
        this.status = status;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}
  • item布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <CheckBox
        android:id="@+id/ck"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"/>
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/ck"
        android:layout_centerVertical="true"/>
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="点击"
        android:layout_centerVertical="true"/>
</RelativeLayout>
  • adapter文件
class NewAdapter extends ArrayAdapter<NewItem> {
    private int newId;//用来储存自定义的布局id
    public NewAdapter(@NonNull Context context, int resource, @NonNull List<NewItem> list) {
        super(context, resource, list);
        this.newId = resource;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        NewItem newItem = getItem(position);
        ViewHolder viewHolder = null;
        if(viewHolder == null){
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(getContext()).inflate(newId,parent,false);
            viewHolder.textView = convertView.findViewById(R.id.text);
            viewHolder.checkBox = convertView .findViewById(R.id.ck);
            viewHolder.button = convertView.findViewById(R.id.btn);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.textView.setText(newItem.getName());
        if(newItem.getStatus()){
            viewHolder.checkBox.setChecked(true);
        }else{
            viewHolder.checkBox.setChecked(false);
        }
        viewHolder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), newItem.getName(), Toast.LENGTH_SHORT).show();
            }
        });
        return convertView;
    }
    class ViewHolder{
        TextView textView;
        CheckBox checkBox;
        Button button;
    }
}
  • java文件
public class MainActivity extends AppCompatActivity {
    ListView listView;
    NewAdapter newAdapter;
    List<NewItem> newItemList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.list);
        newItemList = new ArrayList<>();
        newItemList.add(new NewItem("1","浙江省",false));
        newItemList.add(new NewItem("2","江苏省",true));
        newItemList.add(new NewItem("3","山东省",false));
        newAdapter = new NewAdapter(MainActivity.this,R.layout.new_item,newItemList);

        listView.setAdapter(newAdapter);
        
    }

}

当点击事件需要操作activity中的内容时

  • adapter文件
class NewAdapter extends ArrayAdapter<NewItem> {
    private int newId;//用来储存自定义的布局id
    private BtnClickListerner btnClickListerner;

    /**
     *
     * @param context 上下文
     * @param resource 布局id
     * @param list 数据
     * @param btnClickListerner 点击事件接口
     */
    public NewAdapter(@NonNull Context context, int resource, @NonNull List<NewItem> list,BtnClickListerner btnClickListerner) {
        super(context, resource, list);
        this.newId = resource;
        this.btnClickListerner = btnClickListerner;
    }
    public interface BtnClickListerner{
        public void onBtnClick(int position);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        NewItem newItem = getItem(position);
        ViewHolder viewHolder = null;
        if(viewHolder == null){
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(getContext()).inflate(newId,parent,false);
            viewHolder.textView = convertView.findViewById(R.id.text);
            viewHolder.checkBox = convertView .findViewById(R.id.ck);
            viewHolder.button = convertView.findViewById(R.id.btn);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.textView.setText(newItem.getName());
        if(newItem.getStatus()){
            viewHolder.checkBox.setChecked(true);
        }else{
            viewHolder.checkBox.setChecked(false);
        }
        viewHolder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                btnClickListerner.onBtnClick(position);
            }
        });
        return convertView;
    }
    class ViewHolder{
        TextView textView;
        CheckBox checkBox;
        Button button;
    }
}
  • java文件
public class MainActivity extends AppCompatActivity {
    ListView listView;
    NewAdapter newAdapter;
    List<NewItem> newItemList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.list);
        newItemList = new ArrayList<>();
        newItemList.add(new NewItem("1","浙江省",false));
        newItemList.add(new NewItem("2","江苏省",true));
        newItemList.add(new NewItem("3","山东省",false));
        newAdapter = new NewAdapter(MainActivity.this, R.layout.new_item, newItemList, new NewAdapter.BtnClickListerner() {
            @Override
            public void onBtnClick(int position) {
                getItem(position);
            }
        });

        listView.setAdapter(newAdapter);

    }
	//在这里做对应的操作
    private void getItem(int position) {
        Toast.makeText(MainActivity.this, ""+ position, Toast.LENGTH_SHORT).show();
    }

}

一个列表，多种布局

在这里插入图片描述

  • 布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>

</androidx.constraintlayout.widget.ConstraintLayout>
  • item布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <CheckBox
        android:id="@+id/ck"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"/>
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/ck"
        android:layout_centerVertical="true"/>
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="点击"
        android:layout_centerVertical="true"/>
</RelativeLayout>
  • item1布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
   <ImageView
       android:id="@+id/img"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="center"
        android:layout_centerVertical="true"/>

</LinearLayout>
  • adapter文件
class NewAdapter extends ArrayAdapter<NewItem> {
    private int newId;//用来储存自定义的布局id
    private BtnClickListerner btnClickListerner;
    private List<NewItem> newItemList;

    /**
     *
     * @param context 上下文
     * @param list 数据
     * @param btnClickListerner 点击事件接口
     */
    public NewAdapter(@NonNull Context context, int resource, @NonNull List<NewItem> list,BtnClickListerner btnClickListerner) {
        super(context, resource, list);
        this.newId = resource;
        this.btnClickListerner = btnClickListerner;
        this.newItemList = list;
    }
    public interface BtnClickListerner{
        public void onBtnClick(int position);
    }


    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        NewItem newItem = getItem(position);
        ViewHolder viewHolder = null;
        ViewHolder1 viewHolder1 = null;
        if(convertView == null){
            if(newItem.getType() == 1){
                viewHolder = new ViewHolder();
                convertView = LayoutInflater.from(getContext()).inflate(newItem.getLayoutId(),parent,false);
                viewHolder.textView = convertView.findViewById(R.id.text);
                viewHolder.checkBox = convertView .findViewById(R.id.ck);
                viewHolder.button = convertView.findViewById(R.id.btn);
                convertView.setTag(viewHolder);
                viewHolder.textView.setText(newItem.getName());
                if(newItem.getStatus()){
                    viewHolder.checkBox.setChecked(true);
                }else{
                    viewHolder.checkBox.setChecked(false);
                }
                viewHolder.button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        btnClickListerner.onBtnClick(position);
                    }
                });
            }else{
                viewHolder1 = new ViewHolder1();
                convertView = LayoutInflater.from(getContext()).inflate(newItem.getLayoutId(),parent,false);
                viewHolder1.imageView = convertView.findViewById(R.id.img);
                viewHolder1.textView = convertView.findViewById(R.id.text);
                convertView.setTag(viewHolder1);
                viewHolder1.imageView.setImageResource(R.drawable.ic_launcher_background);
                viewHolder1.textView.setText(newItem.getName());
            }

        }else{
            if(newItem.getType() == 1) {
                viewHolder = (ViewHolder) convertView.getTag();
                viewHolder.textView.setText(newItem.getName());
                if(newItem.getStatus()){
                    viewHolder.checkBox.setChecked(true);
                }else{
                    viewHolder.checkBox.setChecked(false);
                }
                viewHolder.button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        btnClickListerner.onBtnClick(position);
                    }
                });
            }else{
                viewHolder1 = (ViewHolder1) convertView.getTag();
                viewHolder1.imageView.setImageResource(R.drawable.ic_launcher_background);
                viewHolder1.textView.setText(newItem.getName());
            }
        }


        return convertView;
    }
    class ViewHolder{
        TextView textView;
        CheckBox checkBox;
        Button button;
    }
    class ViewHolder1{
        TextView textView;
        ImageView imageView;
    }

    @Override
    public int getItemViewType(int position) {
        return newItemList.get(position).getType();
    }
}
  • java文件
public class MainActivity extends AppCompatActivity {
    ListView listView;
    NewAdapter newAdapter;
    List<NewItem> newItemList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.list);
        newItemList = new ArrayList<>();
        newItemList.add(new NewItem("1","浙江省",false,1,R.layout.new_item));
        newItemList.add(new NewItem("2","江苏省",true,2,R.layout.new_item1));
        newItemList.add(new NewItem("3","山东省",false,1,R.layout.new_item));
        newAdapter = new NewAdapter(MainActivity.this, R.layout.new_item, newItemList, new NewAdapter.BtnClickListerner() {
            @Override
            public void onBtnClick(int position) {
                getItem(position);
            }
        });

        listView.setAdapter(newAdapter);

    }

    private void getItem(int position) {
        Toast.makeText(MainActivity.this, ""+ position, Toast.LENGTH_SHORT).show();
    }

}
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