2024.4.30

要制作底部导航栏用到了fragment容器，今天先把导航栏部分内容完成，明天我们再进一步完成具体页面
DongtiActivity.java
package com.example.share;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

public class DongtaiActivity extends FragmentActivity {

private Button btnFaxian, btnDitu, btnFenxiang, btnXiaoxi, btnWode;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dongtai);

// 找到按钮
btnFaxian = findViewById(R.id.faxian);
btnDitu = findViewById(R.id.ditu);
btnFenxiang = findViewById(R.id.fenxaing);
btnXiaoxi = findViewById(R.id.xiaoxi);
btnWode = findViewById(R.id.wode);

// 设置按钮点击事件
btnFaxian.setOnClickListener(navClickListener);
btnDitu.setOnClickListener(navClickListener);
btnFenxiang.setOnClickListener(navClickListener);
btnXiaoxi.setOnClickListener(navClickListener);
btnWode.setOnClickListener(navClickListener);

// 默认显示发现Fragment
setFragment(new FaxianFragment());
updateButtonState(btnFaxian);
}

private View.OnClickListener navClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Fragment fragment = null;
int id = v.getId();
if (id == R.id.faxian) {
fragment = new FaxianFragment();
updateButtonState(btnFaxian);
} else if (id == R.id.ditu) {
fragment = new DituFragment();
updateButtonState(btnDitu);
} else if (id == R.id.fenxaing) {
fragment = new FenxiangFragment();
updateButtonState(btnFenxiang);
} else if (id == R.id.xiaoxi) {
fragment = new XiaoxiFragment();
updateButtonState(btnXiaoxi);
} else if (id == R.id.wode) {
fragment = new WodeFragment();
updateButtonState(btnWode);
}
if (fragment != null) {
setFragment(fragment);
}
}
};

private void setFragment(Fragment fragment) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
private void updateButtonState(Button activeButton) {
Button[] buttons = {btnFaxian, btnDitu, btnFenxiang, btnXiaoxi, btnWode};
for (Button button : buttons) {
button.setBackgroundColor(getResources().getColor(R.color.white));
button.setTextColor(getResources().getColor(R.color.black));
}
activeButton.setBackgroundColor(getResources().getColor(R.color.gray));
activeButton.setTextColor(getResources().getColor(R.color.white));
}
}
activity_dongtai.xml