android滑动看新闻

package com.example.myapplication5;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

public class TouchActivity extends AppCompatActivity {

    private TextView content;
    // 在 Activity 类中添加
    private GestureDetector gestureDetector;
    String[] news={
            "第一页",
            "第二页",
            "第三页",
            "第四页",
            "第五页"





    };
    int index=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_touch);
        content = findViewById(R.id.content);
        content.setText(news[0]);
        // 初始化手势检测器
        gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                if(e1.getX() >= e2.getX()  ) {
                    if(index<=news.length-2){
                        index++;
                        content.setText(news[index]);
                    }


                }else{
                    //右滑减小index
                    if(index>=1){
                        index--;
                        content.setText(news[index]);
                    }
                }
                return true;
            }
        });

    }
    // 重写 onTouchEvent 方法
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        gestureDetector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }
}