技术

安卓组件通信

2023年11月6日 作者 张舫

通讯方式1 使用 startActivity

组件1逻辑层,发送数据

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package com.example.myapplication;
 
import com.example.myapplication.util.DateUtil;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.widget.TextView;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
 
 
public class ActSendActivity05 extends AppCompatActivity implements View.OnClickListener {
 
    private TextView tv_send;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_act_send05);
        tv_send = findViewById(R.id.tv_send);
        findViewById(R.id.btn_send).setOnClickListener(this);
    }
 
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this, ActReceiveActivity05.class);
        // 创建一个新包裹
        Bundle bundle = new Bundle();
        bundle.putString("request_time", DateUtil.getNowTime());
        bundle.putString("request_content", tv_send.getText().toString());
        intent.putExtras(bundle);
        startActivity(intent);
    }
}

组件1视图层

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<?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"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv_send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="今天的天气真不错" />
 
    <Button
        android:id="@+id/btn_send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="发送以上文字" />
 
</LinearLayout>

组件2接收数据逻辑层

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package com.example.myapplication;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.os.Bundle;
import android.widget.TextView;
 
public class ActReceiveActivity05 extends AppCompatActivity {
 
    private TextView tv_receive;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_act_receive05);
        tv_receive = findViewById(R.id.tv_receive);
        // 从上一个页面传来的意图中获取快递包裹
        Bundle bundle = getIntent().getExtras();
        String request_time = bundle.getString("request_time");
        String request_content = bundle.getString("request_content");
        String desc = String.format("收到请求消息：\n请求时间为%s\n请求内容为%s", request_time, request_content);
        tv_receive.setText(desc);
    }
}

组件2接收数据视图层

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<?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"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv_receive"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
</LinearLayout>

 

通讯方式2

组件通讯方式2逻辑层

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package com.example.myapplication;
 
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
 
import com.example.myapplication.util.DateUtil;
 
public class ActRequestActivity06 extends AppCompatActivity implements View.OnClickListener {
 
    private static final String mRequest = "你睡了吗？来我家睡吧";
    private ActivityResultLauncher<Intent> register;
    private TextView tv_response;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_act_request06);
        TextView tv_request = findViewById(R.id.tv_request);
        tv_request.setText("待发送的消息为：" + mRequest);
 
        tv_response = findViewById(R.id.tv_response);
 
        findViewById(R.id.btn_request).setOnClickListener(this);
 
        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), result -> {
            if (result != null) {
                Intent intent = result.getData();
                if (intent != null && result.getResultCode() == Activity.RESULT_OK) {
                    Bundle bundle = intent.getExtras();
                    String response_time = bundle.getString("response_time");
                    String response_content = bundle.getString("response_content    ");
                    String desc = String.format("收到返回消息：\n应答时间为%s\n应答内容为%s", response_time, response_content);
                    // 把返回消息的详情显示在文本视图上
                    tv_response.setText(desc);
                }
            }
        });
    }
 
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this, ActResponseActivity06.class);
        // 创建一个新包裹
        Bundle bundle = new Bundle();
        bundle.putString("request_time", DateUtil.getNowTime());
        bundle.putString("request_content", mRequest);
        intent.putExtras(bundle);
        register.launch(intent);
    }
}

视图层

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<?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"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv_request"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <Button
        android:id="@+id/btn_request"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="传送请求数据" />
 
    <TextView
        android:id="@+id/tv_response"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
</LinearLayout>

 

接收逻辑层

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package com.example.myapplication;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
 
import com.example.myapplication.util.DateUtil;
 
public class ActResponseActivity06 extends AppCompatActivity implements View.OnClickListener {
 
    private static final String mReponse = "我还没睡，我爸妈不在家。";
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_act_response06);
        TextView tv_request = findViewById(R.id.tv_request);
        // 从上一个页面传来的意图中获取快递包裹
        Bundle bundle = getIntent().getExtras();
        String request_time = bundle.getString("request_time");
        String request_content = bundle.getString("request_content");
        String desc = String.format("收到请求消息：\n请求时间为%s\n请求内容为%s", request_time, request_content);
        // 把请求消息的详情显示在文本视图上
        tv_request.setText(desc);
 
        findViewById(R.id.btn_response).setOnClickListener(this);
 
        TextView tv_response = findViewById(R.id.tv_response);
        tv_response.setText("待返回的消息为：" + mReponse);
    }
 
    @Override
    public void onClick(View v) {
        Intent intent = new Intent();
        Bundle bundle = new Bundle();
        bundle.putString("response_time", DateUtil.getNowTime());
        bundle.putString("response_content", mReponse);
        intent.putExtras(bundle);
        // 携带意图返回上一个页面。RESULT_OK表示处理成功
        setResult(Activity.RESULT_OK, intent);
        // 结束当前的活动页面
        finish();
    }
}

接收视图层

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<?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"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv_request"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <Button
        android:id="@+id/btn_response"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="返回应答数据" />
 
    <TextView
        android:id="@+id/tv_response"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
</LinearLayout>

关于作者

好好学习天天向上

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