Android_广播机制实战演练(数鸭子)

所需文件

MainActivity

package com.example.a426_countducks;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
//import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {private MyBroadcastReceiverOne one;private MyBroadcastReceiverTwo two;private MyBroadcastReceiverThree three;private ImageView iv_horn;private TextView tv_left_content, tv_one, tv_two, tv_three;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);registerReceiver();init();}private void init() {iv_horn = findViewById(R.id.iv_horn);tv_left_content = findViewById(R.id.tv_left_content);tv_one = findViewById(R.id.tv_one);tv_two = findViewById(R.id.tv_two);tv_three = findViewById(R.id.tv_three);iv_horn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {tv_left_content.setVisibility(View.VISIBLE);iv_horn.setClickable(false);  //设置喇叭图片为不可点击的状态Intent intent = new Intent();intent.setAction("Count_Ducks");      // 定义广播的事件类型sendOrderedBroadcast(intent, null);  // 发送有序广播
//                MyBroadcastReceiverThree receiver = new MyBroadcastReceiverThree();
//                sendOrderedBroadcast(intent,null,receiver, null, 0, null, null); // 发送有序广播}});}private void registerReceiver() {// 动态注册MyBroadcastReceiverTwo广播two = new MyBroadcastReceiverTwo();IntentFilter filter2 = new IntentFilter();filter2.setPriority(1000);filter2.addAction("Count_Ducks");registerReceiver(two, filter2);// 动态注册MyBroadcastReceiverOne广播one = new MyBroadcastReceiverOne();IntentFilter filter1 = new IntentFilter();filter1.setPriority(1000);filter1.addAction("Count_Ducks");registerReceiver(one, filter1);// 动态注册MyBroadcastReceiverThree广播three = new MyBroadcastReceiverThree();IntentFilter filter3 = new IntentFilter();filter3.setPriority(600);filter3.addAction("Count_Ducks");registerReceiver(three, filter3);}private int num=0; // 存放序号的变量class MyBroadcastReceiverOne extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {tv_one.setVisibility(View.VISIBLE);num=num+1;tv_one.setText(num+"");Log.i("BroadcastReceiverOne", "广播接收者One,接收到了广播消息");delay();}}class MyBroadcastReceiverTwo extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {tv_two.setVisibility(View.VISIBLE);num=num+1;tv_two.setText(num+"");Log.i("BroadcastReceiverTwo", "广播接收者Two,接收到了广播消息");
//            abortBroadcast(); //拦截有序广播
//            Log.i("BroadcastReceiverTwo","我是广播接收者Two，广播消息被我拦截了");delay();}}class MyBroadcastReceiverThree extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {tv_three.setVisibility(View.VISIBLE);num=num+1;tv_three.setText(num + "");Log.i("BroadcastReceiverThree", "广播接收者Three,接收到了广播消息");delay();}}/*** 延迟500毫秒*/private void delay(){try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(one);unregisterReceiver(two);unregisterReceiver(three);}
}

activity_main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/bg"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="40dp"android:layout_marginLeft="80dp"><ImageViewandroid:id="@+id/iv_horn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:src="@drawable/horn" /><TextViewandroid:id="@+id/tv_left_content"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_toLeftOf="@id/iv_horn"android:background="@drawable/content_left_bg"android:gravity="center"android:text="有序报数"android:textColor="@android:color/white"android:visibility="gone"/></RelativeLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_centerVertical="true"android:gravity="center_horizontal"><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:id="@+id/tv_one"style="@style/badge_style"/><ImageViewandroid:layout_width="120dp"android:layout_height="120dp"android:src="@drawable/duck" /></LinearLayout><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:id="@+id/tv_two"style="@style/badge_style" /><ImageView style="@style/duck_style" /></LinearLayout><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:id="@+id/tv_three"style="@style/badge_style"/><ImageViewstyle="@style/duck_style" /></LinearLayout></LinearLayout>
</RelativeLayout>

styles

<!-- Base application theme. -->
<!--    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">-->
<!--        &lt;!&ndash; Customize your theme here. &ndash;&gt;-->
<!--        <item name="colorPrimary">@color/colorPrimary</item>-->
<!--        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>-->
<!--        <item name="colorAccent">@color/colorAccent</item>-->
<!--    </style>--><resources><style name="badge_style"><item name="android:layout_width">20dp</item><item name="android:layout_height">20dp</item><item name="android:layout_marginLeft">10dp</item><item name="android:paddingLeft">2dp</item><item name="android:paddingRight">2dp</item><item name="android:textColor">@android:color/white</item><item name="android:gravity">center</item><item name="android:background">@drawable/badge_bg</item><item name="android:textStyle">bold</item><item name="android:textSize">12sp</item><item name="android:visibility">gone</item></style><style name="duck_style"><item name="android:layout_width">120dp</item><item name="android:layout_height">120dp</item><item name="android:src">@drawable/duck</item></style></resources>

badge_bg

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"><gradientandroid:endColor="#fe451d"android:startColor="#fe957f"android:type="linear" /><corners android:radius="180dp" />
</shape>

素材

运行结果

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Android_广播机制实战演练(数鸭子)

Android_广播机制实战演练(数鸭子)

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