第二十八篇-Fragment静态用法

效果图：

首先，先大致布局成这个形状

看动画中，横看分为两个区域，所以整体是一个水平排列

设置外层LinearLayout的参数

android:orientation="horizontal"

在看左边，上面是一个文本，下面是一个list，成线性排列，右边是一个Fragement

所以布局方式为：

然后，可以看出左边和右边空间比例为1:3

左边设置android:layout_weight="3"

右边设置android:layout_weight="1"

此时基本形状已经出来了。

接下来设置Fragement，新建一个MyFragement.java的类。右键new--->java class

通过view添加一个布局文件进去

View view=inflater.inflate(R.layout.layout2,container,false);

layout2就是Fragement里面显示的页面，很简单，就一个textview加上一个button

textview就是content里面的内容，button是设置左边textview中要显示的值。

将数据存到数组中

String[] name={"人工智能","大数据","区块链","物联网","云计算","AR"};
String[] content={"人工智能babababababb....","大数据blablabla....",
"区块链。。。。","物联网....","云计算...","AR...."};

通过Adapter添加到listView中

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout);
    listView=findViewById(R.id.listview1);
    textView=findViewById(R.id.textView);
    adapter=new ArrayAdapter<String>(MainActivity.this,R.layout.layout3,name);
    listView.setAdapter(adapter);
    manager=getSupportFragmentManager();//初始化
    MyFragment myFragment= (MyFragment) manager.findFragmentById(R.id.fragement1);
    final TextView textView1=myFragment.getView().findViewById(R.id.textView2);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            textView1.setText(content[position]);
        }
    });
}

apapter使数据绑定到控件变得更加简单和灵活...用途为容器提供子视图，利用视图的数据和元数据来构建每个子视图。

有 arrayAdapter ，simpleCursorAdapter， cursorAdapter resourceCursorAdapter 如果需要自定义适配器 可以扩展抽象类BaseAdapter

然后通过listView.setAdapter(adapter);

将内容放入listview中显示，当点击name里面的内容是，position是记录点击的索引位置，这时候将textview1里面的内容设置为content对应position的数据，所以name和content要对应好。

最后将代码附上。

layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextView" />

        <ListView
            android:id="@+id/listview1"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>

    <fragment
        android:id="@+id/fragement1"
        android:name="com.example.aimee.fragementtest.MyFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </fragment>
</LinearLayout>

layout2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center"
    android:background="#ccffcc"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

layout3.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:padding="28dp"
    android:layout_height="match_parent">

</TextView>

MainActivity.java

package com.example.aimee.fragementtest;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {
    ListView listView;
    TextView textView;
    FragmentManager manager;
    ArrayAdapter<String>adapter;
    String[] name={"人工智能","大数据","区块链","物联网","云计算","AR"};
    String[] content={"人工智能babababababb....","大数据blablabla....",
    "区块链。。。。","物联网....","云计算...","AR...."};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        listView=findViewById(R.id.listview1);
        textView=findViewById(R.id.textView);
        adapter=new ArrayAdapter<String>(MainActivity.this,R.layout.layout3,name);
        listView.setAdapter(adapter);
        manager=getSupportFragmentManager();//初始化
        MyFragment myFragment= (MyFragment) manager.findFragmentById(R.id.fragement1);
        final TextView textView1=myFragment.getView().findViewById(R.id.textView2);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                textView1.setText(content[position]);
            }
        });
    }
}

MyFragement.java

package com.example.aimee.fragementtest;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MyFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.layout2,container,false);

        Button button=view.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView textView=getActivity().findViewById(R.id.textView);
                textView.setText("来自");
                Toast.makeText(getActivity(),"值已传完",Toast.LENGTH_LONG).show();
            }
        });

        return view;
    }
}

Ok。