Android-Fragment和Activity的传值通信
Android-Fragment和Activity的传值通信
Activity向Fragment发送数据
布局文件：
<RelativeLayout 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"
android:orientation="vertical"
tools:context=".MainActivity"
>
<LinearLayout
android:id="@+id/id_frame"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
>
<include
android:id="@+id/id_one"
layout="@layout/btn_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
>include>
<include
android:id="@+id/id_two"
layout="@layout/btn_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
>include>
<include
android:id="@+id/id_three"
layout="@layout/btn_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
>include>
<include
android:id="@+id/id_four"
layout="@layout/btn_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
>include>
LinearLayout>
RelativeLayout>
按钮的布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="@+id/id_btn"
android:layout_width="50dp"
android:layout_height="50dp"
android:background="@drawable/btn_bg"
android:src="@mipmap/ic_launcher"/>
<TextView
android:id="@+id/id_text"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="静态加载"/>
LinearLayout>主活动：
第四个按钮
package com.xieth.as.againfragment;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageButton btn1 = null;
private TextView tv1 = null;
private ImageButton btn2 = null;
private TextView tv2 = null;
private ImageButton btn3 = null;
private TextView tv3 = null;
private ImageButton btn4 = null;
private TextView tv4 = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
}
private void initViews() {
btn1 = (ImageButton) findViewById(R.id.id_one).findViewById(R.id.id_btn);
btn1.setTag(1);
tv1 = (TextView)findViewById(R.id.id_one).findViewById(R.id.id_text);
tv1.setText("静态加载");
btn2 = (ImageButton) findViewById(R.id.id_two).findViewById(R.id.id_btn);
btn2.setTag(2);
tv2 = (TextView)findViewById(R.id.id_two).findViewById(R.id.id_text);
tv2.setText("动态加载");
btn3 = (ImageButton) findViewById(R.id.id_three).findViewById(R.id.id_btn);
btn3.setTag(3);
tv3 = (TextView)findViewById(R.id.id_three).findViewById(R.id.id_text);
tv3.setText("生命周期");
btn4 = (ImageButton) findViewById(R.id.id_four).findViewById(R.id.id_btn);
btn4.setTag(4);
tv4 = (TextView)findViewById(R.id.id_four).findViewById(R.id.id_text);
tv4.setText("传值通信");
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int id = (int) v.getTag();
switch (id) {
case 1:
Toast.makeText(this, "1", Toast.LENGTH_SHORT).show();
break;
case 2:
MyFragmentOne myFragmentOne = new MyFragmentOne();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.id_frame, myFragmentOne);
fragmentTransaction.commit();
break;
case 3:
Toast.makeText(this, "3", Toast.LENGTH_SHORT).show();
break;
case 4:
Intent it = new Intent(this, MainActivity2.class);
startActivity(it);
break;
default:
break;
}
}
}
MyFragmentTwo.java
package com.xieth.as.againfragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
/**
* Created by YR on 2016/04/02.
*/
public class MyFragmentTwo extends Fragment{
private View view = null;
private TextView tv = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view == null) {
view = inflater.inflate(R.layout.flayout_two, container, false);
}
tv = (TextView) view.findViewById(R.id.id_text2);
Bundle bundle = getArguments();
String text = bundle.getString("key");
tv.setText("数据:" + text);
Toast.makeText(getActivity(), text, Toast.LENGTH_SHORT).show();
return view;
}
}
运行效果：
Fragment向Activity传递数据
在MyFragmentTwo里面自定义接口。
private FragmentListener listener = null;
public interface FragmentListener {
void thank(String text);
}
@Override
public void onAttach(Activity activity) {
listener = (FragmentListener) activity;
super.onAttach(activity);
}
MyFragmentTwo.java
package com.xieth.as.againfragment;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
/**
* Created by YR on 2016/04/02.
*/
public class MyFragmentTwo extends Fragment{
private View view = null;
private TextView tv = null;
private FragmentListener listener = null;
public interface FragmentListener {
void thank(String text);
}
@Override
public void onAttach(Activity activity) {
listener = (FragmentListener) activity;
super.onAttach(activity);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view == null) {
view = inflater.inflate(R.layout.flayout_two, container, false);
}
tv = (TextView) view.findViewById(R.id.id_text2);
Bundle bundle = getArguments();
String text = bundle.getString("key");
tv.setText("数据:" + text);
Toast.makeText(getActivity(), text, Toast.LENGTH_SHORT).show();
listener.thank("thanks， Activity!");
return view;
}
}
MainActivity2.java
实现这个接口
public class MainActivity2 extends AppCompatActivity implements MyFragmentTwo.FragmentListener并且重写该方法，即可收到数据
@Override
public void thank(String text) {
Toast.makeText(this, "Fragment返回的数据:" + text, Toast.LENGTH_SHORT).show();
}运行：
完整代码
AndroidStudio开发的