Android点击按钮跳转时出现黑屏，但是return可以实现，如何解决？

Question

Android点击按钮跳转时出现黑屏，但是return可以实现

package com.example.myapplication;


import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity2 extends AppCompatActivity {
    Button btn1,btn2,btn3;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main2);

        btn1 = (Button) findViewById(R.id.lajifenlei);
        btn2 = (Button) findViewById(R.id.jishiqi);
        btn3 = (Button) findViewById(R.id.return_land);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity2.this, lajifenleiActivity.class);
                startActivity(intent);
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity2.this, jishiqiActivity.class);
                startActivity(intent);
            }
        });
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity2.this, MainActivity.class);
                startActivity(intent);
            }
        });
    }


}

package com.example.myapplication;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
public class lajifenleiActivity extends AppCompatActivity {
    //1、定义对象
    ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        //2、绑定控件
        listView=(ListView) findViewById(R.id.list_view);
        //3、准备数据
        String[] data={"可回收垃圾","报纸","图书","包装纸", "塑料", "玻璃", "易拉罐","旧衣物","其他垃圾","卫生纸","尘土", "果壳", "厨余垃圾", "剩饭菜","菜叶菜梗","有害垃圾","电池","灯泡", "水银温度计", "废弃化妆品", "过期药品"};
        //4、创建适配器 连接数据源和控件的桥梁
        //参数 1：当前的上下文环境
        //参数 2：当前列表项所加载的布局文件
        //(android.R.layout.simple_list_item_1)这里的布局文件是Android内置的，里面只有一个textview控件用来显示简单的文本内容
        //参数 3：数据源
        ArrayAdapter<String> adapter=new ArrayAdapter<>(lajifenleiActivity.this,android.R.layout.simple_list_item_1,data);
        //5、将适配器加载到控件中
        listView.setAdapter(adapter);
        //6、为列表中选中的项添加单击响应事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int i, long l) {
                String result=((TextView)view).getText().toString();
                Toast.makeText(lajifenleiActivity.this,"您选择的垃圾是："+result,Toast.LENGTH_LONG).show();
            }
        });
    }
}

Answer 1

可以发一下跳转至的Activity代码，黑屏应该就是报错崩溃了，可以发一下Log日志