一、activity与activity之间的通信(该方式比较简单，就一笔带过)
1、通过intent将值传给即将跳转的activity
Intent intent = new Intent(getContext(), ACOne.class);
intent .putExtra("f", "diyige");
startActivity(inten);/*跳转到下一个页面*/
或者通过bundle
//新建一个显式意图，第一个参数为当前Activity类对象，第二个参数为你要打开的Activity类
Intent intent =new Intent(MainActivity.this,MainActivity2.class);
//用Bundle携带数据
Bundle bundle=new Bundle();
//传递name参数为tinyphp
bundle.putString("name", "tinyphp");
intent.putExtras(bundle);
startActivity(intent);
2、通过startActivityForResult的跳转方式将值传给跳转前的activity
Intent intent=new Intent(this,NextActivity.class);
startActivityForResult(intent,1);//1是requestCode,用于标识请求的来源,在下面的onActivityResult中的requestCode可以区分业务
在下面回调中获取传过来的值
//当开启的activity关闭时调用，也就是下一个activity关闭时，在当前的activity调用
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//requestCode 是从下一个activity关闭的时候传过来的
if(resultCode==10) {
//data就是下一个页面的意图
String name = data.getStringExtra("name");
tx.setText(name);
}else if(resultCode==20){
}
}
}
二、fragment与fragment之间的通信
在fragment1中通过getSupportFragmentManager().findFragmentByTag(）获取fragment2的对象，调用fragment2中的方法将值传过去
Fragment1
package com.wangdong.myapplication;
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.Button;
import android.widget.TextView;
public class Fragment1 extends Fragment implements View.OnClickListener {
private View myFragmentView;
private View view;
private Button mBtn;
private TextView mTv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (myFragmentView == null) {
myFragmentView = inflater.inflate(R.layout.fragment_fragment1, container, false);
}
initView();
return myFragmentView;
}
private void initView() {
mBtn = (Button) myFragmentView.findViewById(R.id.btn);
mTv = (TextView) myFragmentView.findViewById(R.id.tv);
mBtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn:
///"fragment2"是fragment2的tag，new的时候传入的
Fragment2 f2 = (Fragment2) getActivity().getSupportFragmentManager().findFragmentByTag("fragment2");
f2.setTextView("fragment传值给我了");
break;
default:
break;
}
}
}
Activity中创建fragment，并给fragment指定tag
FragmentManager supportFragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();
Fragment1 fragment1 = new Fragment1();
Fragment2 fragment2 = new Fragment2();
//第三个参数为tag
fragmentTransaction.add(R.id.fragment1,fragment1,"fragment1");
fragmentTransaction.add(R.id.fragment2,fragment2,"fragment2");
fragmentTransaction.commit();
Fragment2
package com.wangdong.myapplication;
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;
public class Fragment2 extends Fragment {
private View myFragmentView;
private View view;
private TextView mTv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (myFragmentView == null) {
myFragmentView = inflater.inflate(R.layout.fragment_fragment2, container, false);
}
initView();
return myFragmentView;
}
private void initView() {
mTv = (TextView) myFragmentView.findViewById(R.id.tv);
}
public void setTextView(String str){
if(mTv != null){
mTv.setText(str);
}
}
}
gif.gif
三、activity传值给fragment
1、通过setArguments传递bundle，通过getArguments获取bundle
activity
FragmentTransaction ft=fm.beginTransaction();
OneFragment oneFragment=new OneFragment();
ft.replace(R.id.frame,oneFragment,"f1");
Bundle bundle=new Bundle();
bundle.putString("one","要传的值");
oneFragment.setArguments(bundle);
ft.commit();
Fragment中：
Bundle bundle=getArguments();
String s=bundle.getString("one");
2、通过fragment中的attach（）生命周期，将context转为Mainactivity，然后调用MainActivity中的方法
@Override
public void onAttach(Context context) {
super.onAttach(context);
str = ((MainActivity)context).toFragmentone();
Log.e("ss",str);
}
四、fragment传值给activity
通过在fragment中实现接口的方式，Fragment向Activity传值的步骤 接口回调传递(5部曲)
1.fragment中准备回调接口 接口中声明传值的回调方法
2.在fragment中定义属性private MyListener myListener
3.重写fragment中的onAttach()方法：listener = (MyLisener)getActivity();
4.fragment触发事件时回传值
5.Activity中实现回调接口 重写回调方法获取回传的值并显示
import android.content.Context;
public class FragmentOne extends Fragment {
private Button btn;
private TextView text;
private String str;
private MyListener ac;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.fragmentone,null);
// 给fragment上的按钮添加点击事件
text = v.findViewById(R.id.tv_fragmentone);
btn = v.findViewById(R.id.getImgae);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//通过调用在activity中实现的接口方法，吧数据传给Mainactivity
ac.sendContent("dddd");
}
});
return v;
}
//activity和fragment联系时候调用，fragment必须依赖activty
@Override
public void onAttach(Context context) {
super.onAttach(context);
//获取实现接口的activity
ac = (MyListener) getActivity();//或者ac=(MainActivity) context;
}
//①定义回调接口
public interface MyListener{
public void sendContent(String info);
}
}
在MainActivity中：
import com.example.wofu.aichi010.Fragment.FragmentOne.MyListener;//fragmentOne中的接口
public class MainActivity extends BaseActivity implements RadioGroup.OnCheckedChangeListener,MyListener{
//fragmentOne中的接口，在这实现，以实现fragmentOne传值Mainactivity
public void sendContent(String info) {
if (info!=null && !"".equals(info)) {
Log.e("sss",info);
}else {
}
}
}
五、EventBus实现fragment向Activity传值
（待完成）
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