二十四、Fragment(静态添加FragMent)
1. 具备生命周期(很像一个子activity)
2. 必须委托在activity中才能运行
一、实现静态添加 FragMent
1.右键包=》NEW => FragMent (选择对应的fragment)
2.编辑页面展示代码
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".BlankFragment1"> <TextView android:id="@+id/textview" android:layout_width="match_parent" android:layout_height="40dp" android:text="@string/hello_blank_fragment" /> <Button android:id="@+id/btn" android:layout_width="match_parent" android:layout_height="40dp" android:text="how are you 1" /> </LinearLayout>
3.编辑 “ BlankFragment1 ” 类的相关方法,如下图所示:在 onCreateView 方法中,进行点击事件的绑定
package com.example.myapplication; import android.os.Bundle; import androidx.fragment.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; public class BlankFragment1 extends Fragment { private View root; private TextView textview; private Button button; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (root==null){ root = inflater.inflate(R.layout.fragment_blank1,container,false); } textview = root.findViewById(R.id.textview); button=root.findViewById(R.id.btn); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { textview.setText("Yes ,I am fine 1"); } }); return root; } }
4.主程序的调用(只需要在页面中创建执行标签就可以)
注意:1. 必须设定 id 属性的值
2. name属性跟随需要绑定的 FragMent 页面
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <!--fragment 设置绑定--> <fragment android:id="@+id/fragment1" android:name="com.example.myapplication.BlankFragment1" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1"/> <fragment android:name="com.example.myapplication.BlankFragment2" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:id="@+id/fragment2"/> </LinearLayout>