Fragment作业

xml代码主页面

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.fgmtzyapplication.MainActivity"
    android:orientation="horizontal"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/out"
        android:orientation="vertical"
        >

    </LinearLayout>

</LinearLayout>

Fragment1页面

<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"
    tools:context="com.example.fgmtzyapplication.FirstFragment"
    android:orientation="vertical"
    >

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_blank_fragmen"
        android:layout_gravity="center"
        android:textSize="20sp"
      />

    <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
android:text="@string/xy"
        android:id="@+id/b1"
        android:textSize="20sp"
    />

</LinearLayout>

Fragment2页面

<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"
    tools:context="com.example.fgmtzyapplication.secondFragment"
    android:orientation="vertical"
    >

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:id="@+id/tv"
        />

    <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/xy"
    android:textSize="20sp"
    android:layout_gravity="center"
    android:id="@+id/xy"
    />


</LinearLayout>

FirstFragment

package com.example.fgmtzyapplication;


import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;


/**
 * A simple {@link Fragment} subclass.
 */
public class FirstFragment extends Fragment {

    public FirstFragment() {
        /* Required empty public constructor */
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.fragment_first, container, false);
        Button button = (Button)view.findViewById(R.id.b1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction transaction = getFragmentManager().beginTransaction();
                secondFragment secondFragment=new secondFragment();
                secondFragment.setContent("这是第二个页面");
                transaction.replace(R.id.out,secondFragment);
                transaction.commit();
            }
        });
        return view;
    }

}

secondFragment

package com.example.fgmtzyapplication;


import android.animation.Animator;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;




/**
 * A simple {@link Fragment} subclass.
 */
public class secondFragment extends Fragment {


    private String content;

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


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_second, container, false);
        Button button = (Button) view.findViewById(R.id.xy);
               TextView textView = (TextView) view.findViewById(R.id.tv);
textView.setText(content);


        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(),"这是第二个页面啦",Toast.LENGTH_LONG).show();

                     }
        });
        return view;
        }
    public void setContent(String content) {
        this.content = content;
    }

}

MianActivity

package com.example.fgmtzyapplication;

import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        FirstFragment firstFragment = new FirstFragment();
        transaction.add(R.id.out, firstFragment);
        transaction.commit();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(event.getKeyCode()==KeyEvent.KEYCODE_BACK){
                 FirstFragment firstFragment=new FirstFragment();
            FragmentTransaction transaction = getFragmentManager().beginTransaction();
            transaction.replace(R.id.out,firstFragment);
            transaction.commit();
            return  false;
        } else {
            finish();
        }
        return super.onKeyDown(keyCode, event);


    }

}