Broadcast组件——收发广播应用——收发标准广播

﹏ヽ暗。殇╰゛Y 2023-09-28 15:37 78阅读 0赞

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布局：

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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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MainActivity

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.TextView;
    import androidx.appcompat.app.AppCompatActivity;
    
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
        private final static String TAG = "BroadStandardActivity";
    
        // 这是广播的动作名称，发送广播和接收广播都以它作为接头暗号
        private final static String STANDARD_ACTION = "com.example.chapter09.standard";
    
        private TextView tv_standard; // 声明一个文本视图对象
        private String mDesc = "这里查看标准广播的收听信息";
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            tv_standard = findViewById(R.id.tv_standard);
            tv_standard.setText(mDesc);
    
            findViewById(R.id.btn_send_standard).setOnClickListener(this);
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_send_standard)
            {
                Intent intent = new Intent(STANDARD_ACTION); // 创建指定动作的意图
    
                sendBroadcast(intent); // 发送标准广播
            }
        }
    
    
    
        private StandardReceiver standardReceiver; // 声明一个标准广播的接收器实例
    
    
        @Override
        protected void onStart()
        {
            super.onStart();
            standardReceiver = new StandardReceiver(); // 创建一个标准广播的接收器
    
            // 创建一个意图过滤器，只处理STANDARD_ACTION的广播
            IntentFilter filter = new IntentFilter(STANDARD_ACTION);
    
            registerReceiver(standardReceiver, filter); // 注册接收器，注册之后才能正常接收广播
        }
    
        @Override
        protected void onStop()
        {
            super.onStop();
            unregisterReceiver(standardReceiver); // 注销接收器，注销之后就不再接收广播
        }
    
        // 定义一个标准广播的接收器
        private class StandardReceiver extends BroadcastReceiver
        {
            // 一旦接收到标准广播，马上触发接收器的onReceive方法
            @Override
            public void onReceive(Context context, Intent intent)
            {
                // 广播意图非空，且接头暗号正确
                if (intent != null && intent.getAction().equals(STANDARD_ACTION))
                {
                    mDesc = String.format("%s\n%s 收到一个标准广播", mDesc, DateUtil.getNowTime());
                    tv_standard.setText(mDesc);
                }
            }
        }
    
    }

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