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java - 我如何在列表视图中打开活动数组类名

问题描述

我有 n 类项目自动生成，如窗口中的 java 我想在我的应用程序中使用这个类，我如何在列表视图中按名称打开类活动？android 可以通过工具来实现 

  import android.content.Context;
    import android.content.Intent;
    import android.os.Bundle;
    import androidx.appcompat.app.AppCompatActivity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.TextView;

public class MainActivity extends AppCompatActivity  {
    private static final Class[] CLASSES = new Class[]{
            a.class,
            a1.class,
            a2.class,
            a3.class,
            a4.class,
            a5.class,
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = findViewById(R.id.list_view);

        MyArrayAdapter adapter = new MyArrayAdapter(this, android.R.layout.simple_list_item_1, CLASSES);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }

}

标签： javaandroid

解决方案

是的很容易

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    private static final Class[] CLASSES = new Class[]{
            a.class,
            a1.class,
            a2.class,
            a3.class,
            a4.class,
            a5.class
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = findViewById(R.id.list_view);

        MyArrayAdapter adapter = new MyArrayAdapter(this, android.R.layout.simple_list_item_1, CLASSES);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Class clicked = CLASSES[position];
        startActivity(new Intent(this, clicked));
    }

    private static class MyArrayAdapter extends ArrayAdapter<Class> {
        private Context mContext;
        private Class[] mClasses;

        private MyArrayAdapter(Context context, int resource, Class[] objects) {
            super(context, resource, objects);
            mContext = context;
            mClasses = objects;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;

            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(android.R.layout.simple_list_item_1, null);
            }
            ((TextView) view.findViewById(android.R.id.text1)).setText(mClasses[position].getSimpleName());

            return view;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    style="@style/CustomRelativeLayout"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView
        android:id="@+id/logo"
        style="@style/CustomLogoImageView"
        android:contentDescription="@string/app_name"/>

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/logo"
        android:scrollbars="none"/>

</RelativeLayout>

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