fragment显示被隐藏一部分（Fragment与Activity间的传值通讯）
fragment显示被隐藏一部分（Fragment与Activity间的传值通讯）layout.xmlpackage com.rui.fragmentdemo; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget.RadioGroup; public class MainActivity extends Activity{ private RadioGroup radiogroup;//声明RadioGroup @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.l
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1.配置一下界面 使用RadioGroup实现底部导航栏，其中的4个按钮，本次是只使用传值通讯一个按钮！
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:id="@ id/linearlayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"></LinearLayout>
<RadioGroup
android:id="@ id/radiogrop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<RadioButton
android:id="@ id/one"
android:background="@drawable/radio_pressed"
android:drawableTop="@drawable/ic_launcher_foreground"
android:gravity="center_horizontal"
android:text="静态加载"
android:button="@null"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"/>
<RadioButton
android:id="@ id/two"
android:background="@drawable/radio_pressed"
android:drawableTop="@drawable/ic_launcher_foreground"
android:gravity="center_horizontal"
android:text="动态加载"
android:button="@null"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"/>
<RadioButton
android:id="@ id/three"
android:background="@drawable/radio_pressed"
android:drawableTop="@drawable/ic_launcher_foreground"
android:gravity="center_horizontal"
android:text="生命周期"
android:button="@null"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"/>
<RadioButton
android:id="@ id/four"
android:background="@drawable/radio_pressed"
android:drawableTop="@drawable/ic_launcher_foreground"
android:gravity="center_horizontal"
android:text="传值通讯"
android:button="@null"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"/>
</RadioGroup>
</RelativeLayout>
接下来是底部导航栏的选择器配置文件
radio_pressed.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/garay" android:State_checked="true"></item>
<item android:drawable="@color/white"></item>
</selector>
接下来创建一个Activity
MainActivity.java
package com.rui.fragmentdemo;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
public class MainActivity extends Activity{
private RadioGroup radiogroup;//声明RadioGroup
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//实例化RadioGroup
radiogroup = (RadioGroup)findViewById(R.id.radiogrop);
//使用RadioGroup监听事件，使用监听方法OnCheckedChangeListener
radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup int i) {
switch (i){
case R.id.one:
case R.id.two:
case R.id.three:
case R.id.four:
//跳转MainActivity3
Intent intent1 = new Intent(MainActivity.this MainActivity3.class);
startActivity(intent1);
break;
}
}
});
}
}
创建布局文件layout.xml，为MainActivity3提供布局
layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@ id/linear"
android:tag="tag"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="@ id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@ id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送"/>
</LinearLayout>
创建布局activity_main3提供Fragment转换
<?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">
<TextView
android:id="@ id/tview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
创建一个继承Fragment的类
MyFragment2.java
package com.rui.fragmentdemo;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
/**
* Created by qqazl001 on 2018/3/21.
*/
public class MyFragment2 extends Fragment{
private String code="一个简单的小答复！";//测试回传给Acticity的值
public Listener listener;//获取一个Listener对象
//定义一个接口，里面定义一个无实体的方法，方便Activity调用
public interface Listener {
public void message(String code);
}
//Fragment添加到Activity的时候运行
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
//将activity赋予listener，让listerner得到Activity对象
listener = (Listener)activity;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater @Nullable ViewGroup container Bundle savedInstanceState) {
//布局转换成View
View view = inflater.inflate(R.layout.activity_main3 container false);
//通过View实例化TextView
TextView tv1 = (TextView) view.findViewById(R.id.tview);
//获取Activity传送过来的值
String text = getArguments().get("value") "";
//把获取的值设置到tv1中
tv1.setText(text);
Toast.makeText(getActivity() "接收到了Activity发送来的:" text Toast.LENGTH_SHORT).show();
Toast.makeText(getActivity() "向Activity发送消息:" code Toast.LENGTH_SHORT).show();
//将消息放入message让Activity回调得到消息内容
listener.message(code);
return view;
}
}
接下来配置MainActivity3
MainActivity3.java
package com.rui.fragmentdemo;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
* Created by qqazl001 on 2018/3/21.
*/
public class MainActivity3 extends Activity implements MyFragment2.Listener{
private EditText editText;//声明tv1
private Button bt1;//声明bt1
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
//实例化tv1，bt1
editText = (EditText) findViewById(R.id.edittext);
bt1 = (Button)findViewById(R.id.button);
//按钮监听事件
bt1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//获取输入框的值
String value = editText.getText().toString();
//实例化MyFragment2对象
MyFragment2 mf2 = new MyFragment2();
//实例化一个Bundle 用来存放数据
Bundle bundle = new Bundle();
//Bundle加入编辑框数据
bundle.putString("value" value);
//发送给Fragment
mf2.setArguments(bundle);
//获取事物管理者
FragmentManager fm = getFragmentManager();
//开启事物
FragmentTransaction ft = fm.beginTransaction();
//向fragemnt添加fragment
// 参数1 是添加到哪个布局
//参数2 继承了Fragment的类
//参数3 Fragment的tag 和 id 类似
ft.add(R.id.linear mf2 "tag");
//提交事务
ft.commit();
Toast.makeText(MainActivity3.this "向Fragment发送数:”:" value Toast.LENGTH_SHORT).show();
}
});
}
//实现Fragment的接口方法，用于接收Fragment发送的消息
@Override
public void message(String code) {
Toast.makeText(MainActivity3.this "接收到了Fragment的回复:" code Toast.LENGTH_SHORT).show();
}
}
效果如下：
