Broadcast组件——收发广播应用——收发有序广播

男娘i 2023-09-28 16:26 47阅读 0赞

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布局：

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代码：

package com.example.myapplication;
    
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.CheckBox;
    import android.widget.TextView;
    import androidx.appcompat.app.AppCompatActivity;
    
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
        private final static String TAG = "BroadOrderActivity";
        private final static String ORDER_ACTION = "com.example.chapter09.order";
        private CheckBox ck_abort;
        private TextView tv_order;
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            ck_abort = findViewById(R.id.ck_abort);
            tv_order = findViewById(R.id.tv_order);
            findViewById(R.id.btn_send_order).setOnClickListener(this);
        }
    
        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.btn_send_order) {
                tv_order.setText("");
                Intent intent = new Intent(ORDER_ACTION); // 创建一个指定动作的意图
                sendOrderedBroadcast(intent, null); // 发送有序广播
            }
        }
    
        @Override
        protected void onStart()
        {
            super.onStart();
    
            // 多个接收器处理有序广播的顺序规则为：
            // 1、优先级越大的接收器，越早收到有序广播；
            // 2、优先级相同的时候，越早注册的接收器越早收到有序广播
            orderAReceiver = new OrderAReceiver(); // 创建一个有序广播的接收器A
    
            // 创建一个意图过滤器A，只处理ORDER_ACTION的广播
            IntentFilter filterA = new IntentFilter(ORDER_ACTION);
    
            filterA.setPriority(8); // 设置过滤器A的优先级，数值越大优先级越高
    
            registerReceiver(orderAReceiver, filterA); // 注册接收器A，注册之后才能正常接收广播
    
            orderBReceiver = new OrderBReceiver(); // 创建一个有序广播的接收器B
    
            // 创建一个意图过滤器A，只处理ORDER_ACTION的广播
            IntentFilter filterB = new IntentFilter(ORDER_ACTION);
    
            filterB.setPriority(10); // 设置过滤器B的优先级，数值越大优先级越高
    
            registerReceiver(orderBReceiver, filterB); // 注册接收器B，注册之后才能正常接收广播
    
        }
    
        @Override
        protected void onStop()
        {
            super.onStop();
    
            unregisterReceiver(orderAReceiver); // 注销接收器A，注销之后就不再接收广播
            unregisterReceiver(orderBReceiver); // 注销接收器B，注销之后就不再接收广播
        }
    
        private OrderAReceiver orderAReceiver; // 声明有序广播接收器A的实例
    
        // 定义一个有序广播的接收器A
        private class OrderAReceiver extends BroadcastReceiver
        {
            // 一旦接收到有序广播，马上触发接收器的onReceive方法
            @Override
            public void onReceive(Context context, Intent intent)
            {
                if (intent != null && intent.getAction().equals(ORDER_ACTION))
                {
                    String desc = String.format("%s%s 接收器A收到一个有序广播\n", tv_order.getText().toString(), DateUtil.getNowTime());
    
                    tv_order.setText(desc);
    
                    if (ck_abort.isChecked())
                    {
                        abortBroadcast(); // 中断广播，此时后面的接收器无法收到该广播
                    }
                }
            }
        }
    
        private OrderBReceiver orderBReceiver; // 声明有序广播接收器B的实例
    
        // 定义一个有序广播的接收器B
        private class OrderBReceiver extends BroadcastReceiver
        {
            // 一旦接收到有序广播B，马上触发接收器的onReceive方法
            @Override
            public void onReceive(Context context, Intent intent)
            {
                if (intent != null && intent.getAction().equals(ORDER_ACTION))
                {
                    String desc = String.format("%s%s 接收器B收到一个有序广播\n", tv_order.getText().toString(), DateUtil.getNowTime());
    
                    tv_order.setText(desc);
    
                    if (ck_abort.isChecked())
                    {
                        abortBroadcast(); // 中断广播，此时后面的接收器无法收到该广播
                    }
                }
            }
        }
    
    }

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DateUtil：

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.text.TextUtils;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    @SuppressLint("SimpleDateFormat")
    public class DateUtil
    {
        // 获取当前的日期时间
        public static String getNowDateTime(String formatStr)
        {
            String format = formatStr;
            if (TextUtils.isEmpty(format)) {
                format = "yyyyMMddHHmmss";
            }
    
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(new Date());
        }
    
        // 获取当前的时间
        public static String getNowTime()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            return sdf.format(new Date());
        }
    
        // 获取当前的时间(精确到毫秒)
        public static String getNowTimeDetail()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS");
            return sdf.format(new Date());
        }
    
        public static String getNowDate()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            return sdf.format(new Date());
        }
    
        public static String getDate(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static String getMonth(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static Date formatString(String strTime)
        {
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    
            try {
                date = sdf.parse(strTime);
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return date;
        }
    
    }

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