在单个活动中动态实现多个片段 [英] Implementing multiple fragments in a single activity Dynamically
本文介绍了在单个活动中动态实现多个片段的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试实施的用例::
- 我正在使用动态片段
- 我在一个活动中使用了三个片段
- 我的目标是在所有三个片段之间进行通信
- 我正在使用片段支持包
每个片段都有一个小部件
Each fragment has a single widget
my_fragment1
有edittext
my_fragment2
有button
my_fragment3
有TextView
my_fragment1
hasedittext
my_fragment2
hasbutton
my_fragment3
hasTextView
到目前为止,我已经构建了以下大部分场景
Top_Fragment.java
public class Top_Fragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view=inflater.inflate(R.layout.my_fragment1, container, false);
return view;
}
}
Middle_Fragment.java
package com.example.deleteme;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class Middle_Fragment extends Fragment{
View view;
Button btn;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view=inflater.inflate(R.layout.my_fragment2, container, false);
btn=(Button) view.findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
return view;
}
}
Bottom_Fragment.java
public class Bottom_Fragment extends Fragment{
View view;
TextView display_text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view=inflater.inflate(R.layout.my_fragment3, container,false);
display_text=(TextView) view.findViewById(R.id.editText1);
return view;
}
public void setName(String Name){
display_text.setText("Result::" + Name);
}
}
MainActivity.java
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Top_Fragment frg=new Top_Fragment();//create the fragment instance for the top fragment
Middle_Fragment frg1=new Middle_Fragment();//create the fragment instance for the middle fragment
Bottom_Fragment frg2=new Bottom_Fragment();//create the fragment instance for the bottom fragment
FragmentManager manager=getSupportFragmentManager();//create an instance of fragment manager
FragmentTransaction transaction=manager.beginTransaction();//create an instance of Fragment-transaction
transaction.add(R.id.My_Container_1_ID, frg, "Frag_Top_tag");
transaction.add(R.id.My_Container_2_ID, frg1, "Frag_Middle_tag");
transaction.add(R.id.My_Container_3_ID, frg2, "Frag_Bottom_tag");
transaction.commit();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity"
android:background="@color/black">
<FrameLayout
android:id="@+id/My_Container_1_ID"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:background="@color/yellow">
</FrameLayout>
<FrameLayout
android:id="@+id/My_Container_2_ID"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:layout_alignParentLeft="true"
android:layout_below="@+id/My_Container_1_ID"
android:background="@color/Orange" >
</FrameLayout>
<FrameLayout
android:id="@+id/My_Container_3_ID"
android:layout_width="fill_parent"
android:layout_height="150dp"
android:layout_alignParentLeft="true"
android:layout_below="@+id/My_Container_2_ID"
android:background="@color/purple" >
</FrameLayout>
</RelativeLayout>
my_fragment1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/green" >
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:ems="10"
android:textColor="#000000"
android:singleLine="true" >
<requestFocus />
</EditText>
</RelativeLayout>
my_fragment2.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"
android:orientation="vertical"
android:background="@color/pink">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="@color/black"
android:text="Button"
android:textColor="#FFFFFF" />
</RelativeLayout>
my_fragment3.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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="TextView"
android:textColor="#000000"
android:textSize="30dp" />
</RelativeLayout>
我的输出如下 ::
我在实现过程中遇到的问题 ::
- 我无法将从
edit text
获得的值设置为textview
点击按钮
- I am not able to set the value obtained from
edit text
totextview
on click of thebutton
有什么想法吗?
推荐答案
所有 Fragment-to-Fragment 通信都是通过关联的 Activity 完成的.两个 Fragment 永远不应该直接通信.
All Fragment-to-Fragment communication is done through the associated Activity. Two Fragments should never communicate directly.
http://developer.android.com/training/basics/fragments/沟通.html
test.java
//在你的例子中它的 MainActivity
test.java
// in your case its MainActivity
public class test extends FragmentActivity implements textEntered {
String value;
boolean check = false;
BottomFragment frg2;
FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Top_Fragment frg = new Top_Fragment();
frg2 = new BottomFragment();
FragmentManager manager = getSupportFragmentManager();
transaction = manager.beginTransaction();
transaction.add(R.id.My_Container_1_ID, frg, "Frag_Top_tag");
transaction.add(R.id.My_Container_3_ID, frg2, "Frag_Bottom_tag");
transaction.commit();
}
@Override
public void setValue(String editextvalue) {
value = editextvalue;
if (frg2 != null) {
frg2.setName(value);
} else {
Toast.makeText(getApplicationContext(), "fragment 2 is null", 1000).show();
}
}
}
Top_Fragment.java
public class Top_Fragment extends Fragment {
textEntered mCallback;
Button b;
EditText ed;
public interface textEntered {
public void setValue(String editextvalue);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.my_fragment1, container, false);
ed = (EditText) view.findViewById(R.id.editText1);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
b = (Button) getView().findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String s = ed.getText().toString();
mCallback.setValue(s);
}
});
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
try {
mCallback = (textEntered) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() +
" must implement textEntered");
}
}
}
my_fragment1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:ems="10"
android:textColor="#000000"
android:singleLine="true" >
<requestFocus />
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="Button" />
</RelativeLayout>
改为
display_text=(TextView) view.findViewById(R.id.textView1);
// id is textView 1 not editText1
在底部片段中
捕捉
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