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.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;
@Override
protected 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() {
@Override
public void onClick(View v) {
tv_left_content.setVisibility(View.VISIBLE);
iv_horn.setClickable(false);
Intent intent = new Intent();
intent.setAction("Count_Ducks");
sendOrderedBroadcast(intent, null);
}
});
}
private void registerReceiver() {
two = new MyBroadcastReceiverTwo();
IntentFilter filter2 = new IntentFilter();
filter2.setPriority(1000);
filter2.addAction("Count_Ducks");
registerReceiver(two, filter2);
one = new MyBroadcastReceiverOne();
IntentFilter filter1 = new IntentFilter();
filter1.setPriority(1000);
filter1.addAction("Count_Ducks");
registerReceiver(one, filter1);
three = new MyBroadcastReceiverThree();
IntentFilter filter3 = new IntentFilter();
filter3.setPriority(600);
filter3.addAction("Count_Ducks");
registerReceiver(three, filter3);
}
private int num=0;
class MyBroadcastReceiverOne extends BroadcastReceiver {
@Override
public 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 {
@Override
public 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");
delay();
}
}
class MyBroadcastReceiverThree extends BroadcastReceiver {
@Override
public 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();
}
}
private void delay(){
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
protected 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">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:layout_marginLeft="80dp">
<ImageView
android:id="@+id/iv_horn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="@drawable/horn" />
<TextView
android: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>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:gravity="center_horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_one"
style="@style/badge_style"/>
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:src="@drawable/duck" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_two"
style="@style/badge_style" />
<ImageView style="@style/duck_style" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_three"
style="@style/badge_style"/>
<ImageView
style="@style/duck_style" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
styles
<!-- Base application theme. -->
<!-- <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">-->
<!-- <!– Customize your theme here. –>-->
<!-- <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">
<gradient
android:endColor="#fe451d"
android:startColor="#fe957f"
android:type="linear" />
<corners android:radius="180dp" />
</shape>
素材
运行结果
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