Android Studio —— fragment

效果

 

源码

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代码

     MainActivity.java

package com.example.application;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;

import android.os.Bundle;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    String name[] = new String[]{"人工智能","大数据","区块链","物联网","云计算","VR"};
    String cont[] = new String[]{"人工智能人工智能人工智能人工智能人工智能人工智能人工智能人工智能人工智能人工智能.",
                                 "大数据大数据大数据大数据大数据大数据大数据大数据大数据大数据.",
                                 "区块链区块链区块链区块链区块链区块链区块链区块链区块链区块链.",
                                 "物联网物联网物联网物联网物联网物联网物联网物联网物联网物联网.",
                                 "云计算云计算云计算云计算云计算云计算云计算云计算云计算云计算.",
                                 "VRVRVRVRVRVRVRVRVRVR"};

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

        FragmentManager fragmentManager = getSupportFragmentManager();
        MyFragment myFragment = (MyFragment) fragmentManager.findFragmentById(R.id.myfragment);
        TextView TV = myFragment.getView().findViewById(R.id.TV);
        TV.setText(cont[0]);

        ArrayAdapter<String> nameAdapter = new ArrayAdapter<String>(MainActivity.this,R.layout.item,name);
        ListView listview = findViewById(R.id.listview);
        listview.setAdapter(nameAdapter);
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                TV.setText(cont[i]);
            }
        });
    }
}

 
     activity_main.xml

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

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        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/listview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="20dp"
            android:layout_weight="1" />
    </LinearLayout>

    <fragment
        android:id="@+id/myfragment"
        android:name="com.example.application.MyFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3" />

</LinearLayout>

 
     MyFragment.java

package com.example.application;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

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.myfragment,container,false);
        Button buttonSEND = view.findViewById(R.id.buttonSEND);
        buttonSEND.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                TextView textView = getActivity().findViewById(R.id.textView);
                textView.setText("来自Fragment:" + System.currentTimeMillis());
            }
        });
        return view;
    }
}

 
     myfragment.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"
    android:background="#D2ED5A"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/TV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:text="..." />

    <Button
        android:id="@+id/buttonSEND"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_weight="0"
        android:text="发送" />
</LinearLayout>

 
     item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:gravity="center"
    android:text="123"
    android:textSize="16sp">
</TextView>

 

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笔者 - jxd

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