Day05

fragment传值 方法一

fragment布局一

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button_one"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:text="发送"
        android:layout_centerInParent="true"/>

</RelativeLayout>

acticity布局

<RelativeLayout
    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">

    <RelativeLayout
        android:id="@+id/rela"
        android:layout_width="match_parent"
        android:layout_height="300dp">

    </RelativeLayout>

    <Button
        android:id="@+id/button_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="show"
        android:textSize="25dp"
        android:layout_centerInParent="true"
        android:onClick="show"/>

    <Button
        android:id="@+id/button_cz"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="接收"
        android:textSize="25sp"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/button_show"
        android:layout_marginTop="10dp"/>

</RelativeLayout>

java代码

Fragment1 java代码

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

public class Fragment1 extends Fragment {

    private Handler handler;

    public Fragment1(Handler handler) {
        this.handler = handler;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View inflate = inflater.inflate(R.layout.fragment1, container, false);
        inflate.findViewById(R.id.button_one).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Message message = new Message();
                message.obj = "我是发送的消息";
                message.what = 1;
                handler.sendMessage(message);
            }
        });
        return inflate;
    }
}

MainActivity java代码

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);

            switch (msg.what){

                case 1:
                    String s = msg.obj.toString();
                    Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
                    break;

            }

        }
    };

    private Fragment1 fragment1 = new Fragment1(handler);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void show(View view) {

        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = manager.beginTransaction();
        fragmentTransaction.add(R.id.rela,fragment1,"啊啊啊");
        fragmentTransaction.commit();

    }
}

效果图

bb.gif

fragment传值 方法二

fragment布局一

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button_one"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:text="发送"
        android:layout_centerInParent="true"/>

</RelativeLayout>

acticity布局

<RelativeLayout
    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">

    <RelativeLayout
        android:id="@+id/rela"
        android:layout_width="match_parent"
        android:layout_height="300dp">

    </RelativeLayout>

    <Button
        android:id="@+id/button_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="show"
        android:textSize="25dp"
        android:layout_centerInParent="true"
        android:onClick="show"/>

    <Button
        android:id="@+id/button_cz"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="接收"
        android:textSize="25sp"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/button_show"
        android:layout_marginTop="10dp"
        android:onClick="jieshou"/>
</RelativeLayout>

java代码

Fragment1 java代码

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

public class Fragment1 extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View inflate = inflater.inflate(R.layout.fragment1, container, false);
        inflate.findViewById(R.id.button_one).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Bundle bundle = new Bundle();
                bundle.putString("key","我是发送的数据");
                Fragment1.this.setArguments(bundle);
            }
        });
        return inflate;
    }
}

MainActivity java代码

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

import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Fragment1 fragment1 = new Fragment1();
    private FragmentManager manager;

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

        manager = getSupportFragmentManager();
    }

    public void show(View view) {

        FragmentTransaction fragmentTransaction = manager.beginTransaction();
        fragmentTransaction.add(R.id.rela,fragment1,"abc");
        fragmentTransaction.commit();

    }

    public void jieshou(View view) {

        Bundle arguments = fragment1.getArguments();
        String key = arguments.getString("key");
        if (key != null){
            Toast.makeText(this, key, Toast.LENGTH_SHORT).show();
        }

    }
}

效果图

aa.gif