Fragment隐藏

最新推荐文章于 2025-04-25 00:15:00 发布

翻译最新推荐文章于 2025-04-25 00:15:00 发布 · 365 阅读

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本文介绍了一种在安卓应用中实现侧滑菜单和多个Fragment动态切换的方法。通过使用DrawerLayout实现侧滑效果，并结合Fragment和FragmentTransaction进行内容区域的动态更新。此外，还提供了隐藏非活动Fragment的功能。

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* 和MainActivity逻辑一样
* 简单处理,底部标签切换;

* 使用某个Fragment的时候再new出来;

//获取管理器

fragmentManager = getSupportFragmentManager();

//初始化组件
drawerLayout = (DrawerLayout) findViewById(R.id.dl_chehua);
frameLayout = (FrameLayout) findViewById(R.id.fl_zhanwei);
group = (RadioGroup) findViewById(R.id.group);
//侧滑布局
linearLayout = (LinearLayout) findViewById(R.id.ll_chehua);
//侧滑布局中的图片
imageView = (ImageView) findViewById(R.id.jqr);
//封装数据
list = new ArrayList<>();
//点击机器人关闭侧滑

（也可以用普通的监听事件）
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
drawerLayout.closeDrawer(linearLayout);
}
});
//将所有Fragment添加到占位布局

//添加一个事务

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
frag1 = new frag1();
fragmentTransaction
.add(R.id.fl_zhanwei, frag1)
.commit();

//RadioGroupd点击监听
group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
hideFragments();//隐藏所有Fragment;

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
switch (i) {
case R.id.but1:
fragmentTransaction.show(frag1).commit();
break;
case R.id.but2:
if (frag2 == null) {
frag2 = new frag2();
fragmentTransaction.add(R.id.fl_zhanwei,frag2).commit();
} else {
fragmentTransaction.show(frag2).commit();
}

break;
case R.id.but3:
if (frag3 == null) {
frag3 = new frag3();
fragmentTransaction.add(R.id.fl_zhanwei, frag3).commit();
} else {
fragmentTransaction.show(frag3).commit();
}
break;
case R.id.but4:
if (frag4 == null) {
frag4 = new frag4();
fragmentTransaction.add(R.id.fl_zhanwei, frag4).commit();
} else {
fragmentTransaction.show(frag4).commit();
}
break;

}
}
});
}

//隐藏fragment的方法

public void hideFragments() {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
if (frag1!= null && frag1.isAdded()) {
fragmentTransaction.hide(frag1);
}
if (frag2 != null && frag2.isAdded()) {
fragmentTransaction.hide(frag2);
}
if (frag3 != null && frag3.isAdded()) {
fragmentTransaction.hide(frag3);
}
if (frag4 != null && frag4.isAdded()) {
fragmentTransaction.hide(frag4);
}
fragmentTransaction.commit();

}