Fragment 的通信，flutter 通知推送

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_one, null);

et_input_text = view.findViewById(R.id.et_input_text);

btn_set_text = view.findViewById(R.id.btn_set_text);

//方法一：第一步：获取 TwoFragrement 对象，可以使用该对象的方法了

TwoFragrement two = (TwoFragrement) getActivity().getFragmentManager().findFragmentByTag("two");

//第三步:调用对象公开的方法

btn_set_text.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

two.setText(et_input_text.getText().toString());

}

});

return view;

}

}

twoFragment 的 java 代码

package com.wust.twofragrement;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>

• date: 2021/5/27 16:26<br/>

• @author yiqi<br />

• @email：1820762465@qq.com

• @QQ：1820762465

• @since JDK 1.8

*/

public class TwoFragrement extends Fragment {

private TextView tv_show_text;

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_two, null);

tv_show_text = view.findViewById(R.id.tv_show_text);

return view;

}

//第二步：在第二个 fragment 里公开一个修改自身 TextView 的方法

public void setText(String str){

tv_show_text.setText(str);

}

}

MainActivity 的 java 代码

package com.wust.twofragrement;

import androidx.fragment.app.FragmentActivity;

import android.os.Bundle;

public class MainActivity extends FragmentActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//第一步,获取 Fragrement

OneFragrement oneFragrement = new OneFragrement();

TwoFragrement twoFragrement = new TwoFragrement();

//第二步，占坑

getFragmentManager().beginTransaction().replace(R.id.fl_one,oneFragrement,"one").commit();

getFragmentManager().beginTransaction().replace(R.id.fl_two,twoFragrement,"two").commit();

}

}

• 方法二：使用回调

oneFragment 的 java 代码

package com.wust.twofragrement;

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 android.app.Fragment;

import android.widget.Button;

import android.widget.EditText;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>

• date: 2021/5/27 16:26<br/>

• @author yiqi<br />

• @email：1820762465@qq.com

• @QQ：1820762465

• @since JDK 1.8

*/

public class OneFragrement extends Fragment {

private Button btn_set_text;

private EditText et_input_text;

private onReceiveData mOnReceiveData;

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_one, null);

et_input_text = view.findViewById(R.id.et_input_text);

btn_set_text = view.findViewById(R.id.btn_set_text);

btn_set_text.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//第三步：调用

mOnReceiveData.receiveData(et_input_text.getText().toString());

}

});

return view;

}

//第一步：定义接口

public interface onReceiveData{

void receiveData(String s

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);

}

//第二步：暴露接口

public void setOnReceiveDataListener(onReceiveData onReceiveData){

this.mOnReceiveData = onReceiveData;

}

}

twoFragment 的 java 代码

package com.wust.twofragrement;

import android.app.Activity;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;