Android：Frament详解

Fragment是什么Fragment运行

具备生命周期；依托Activity运行

package com.example.fragmentlearn1;

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;

import org.w3c.dom.Text;


public class Fragemnt1 extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public Fragemnt1() {
        // Required empty public constructor
    }

    private View root;
    private TextView textView;
    private Button button;

    
    // TODO: Rename and change types and number of parameters
    public static Fragemnt1 newInstance(String param1, String param2) {
        Fragemnt1 fragment = new Fragemnt1();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        if (root == null)
        // Inflate the layout for this fragment
        root = inflater.inflate(R.layout.fragment_fragemnt1, container, false);
        textView = root.findViewById(R.id.tv1);
        button = root.findViewById(R.id.btn1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textView.setText("啦啦啦啦啦");
            }
        });
        return root;
    }
}

package com.example.fragmentlearn1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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