LIstview的使用和数据填充

1：编写我们布局文件的代码：

<?xml version="1.0" encoding="utf-8"?>

java的文件：

    package com.example.myapplication;            import androidx.appcompat.app.AppCompatActivity;            import android.content.Intent;            import android.os.Bundle;            import android.view.LayoutInflater;            import android.view.View;            import android.view.ViewGroup;            import android.widget.BaseAdapter;            import android.widget.Button;            import android.widget.ImageView;            import android.widget.ListView;            import android.widget.Toast;    public class MainActivity extends AppCompatActivity {        // todo------------> 成员变量        private ListView listview;       // todo 创建我们的数组        private int[] img = new int[]{            // 在我们的这个位置的话是我们的先关的适配器            R.mipmap.one, R.mipmap.two, R.mipmap.three,       };        private  String[] str = new String[]{                "按钮1","按钮2","按钮3"        };        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            initData();        }        private void initData() {            // todo -----------> 找到我们的id            listview = (ListView) findViewById(R.id.listview);            // todo -------------》 在我们的这个位置的话就是创建我们的相关的适配器            MyAdapter myAdapter = new MyAdapter();            listview.setAdapter(myAdapter);            setOnClick(new OnClick() {                @Override                public void itemOnClick(int pos) {                    // todo ----------> 点击事件                    Intent intent;                    switch (pos){                        case 0:                            intent = new Intent(MainActivity.this, SecondActivity.class);                            Toast.makeText(MainActivity.this, "跳转成功", Toast.LENGTH_SHORT).show();                            break;                        case 1:                            intent = new Intent(MainActivity.this, SecondActivity.class);                            Toast.makeText(MainActivity.this, "跳转成功", Toast.LENGTH_SHORT).show();                            break;                        case 2:                            intent = new Intent(MainActivity.this, SecondActivity.class);                            Toast.makeText(MainActivity.this, "跳转成功", Toast.LENGTH_SHORT).show();                            break;                        default:                            throw new IllegalStateException("Unexpected value: " + pos);                    }                    // todo ------------> 开启页面跳转                   startActivity(intent);                }            });        }        //todo -----------> 这个是我们的的适配器继承我们的baseadapter        private class MyAdapter extends BaseAdapter {            @Override            public int getCount() {                return img.length;            }            @Override            public Object getItem(int position) {                return img[position];            }            @Override            public long getItemId(int position) {                return position;            }            @Override            public View getView(final int position, View convertView, ViewGroup parent) {                ViewHolder viewHolder;                if(convertView == null){                    convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.list_model,null);                    viewHolder = new ViewHolder();                    viewHolder.imageModel = (ImageView) convertView.findViewById(R.id.image_model);                    viewHolder.text = (Button) convertView.findViewById(R.id.text);                    convertView.setTag(viewHolder);                }else {                    viewHolder = (ViewHolder) convertView.getTag();                }                // todo ----------> 数据填充                viewHolder.imageModel.setBackgroundResource(img[position]);                viewHolder.text.setText(str[position]);                viewHolder.text.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        onClick.itemOnClick(position);                    }                });                return convertView;            }        }        class ViewHolder{             ImageView imageModel;             Button text;        }    //  todo ------------》创建我们的接口        public  interface  OnClick{            void itemOnClick(int pos);    }        private OnClick onClick;        public void setOnClick(OnClick onClick) {            this.onClick = onClick;        }    }

第二个跳转页面的文件：

<?xml version="1.0" encoding="utf-8"?>

java文件及代码：

package com.example.myapplication;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;public class SecondActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_second);    }}

布局的xml文件：

<?xml version="1.0" encoding="utf-8"?>

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