本章先不进行详细讲解,后续补充,如有问题请在评论区打出来~~~
共有两个实例:饭堂开饭与数鸭子
第一个实例效果:
数鸭子效果图
饭堂实例:
首先是布局代码
<?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="@android:color/white">
<RelativeLayout
android:id="@+id/ll_horn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/horn" />
<TextView
android:id="@+id/tv_right_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/image"
android:background="@drawable/content_right_bg"
android:gravity="center"
android:text="点击喇叭"
android:textColor="@android:color/white" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_right_content"
android:layout_marginTop="20dp"
android:layout_toRightOf="@id/image"
android:src="@drawable/foods" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/ll_horn"
android:layout_marginTop="100dp" >
<ImageView
android:id="@+id/iv_rabbit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="@drawable/rabbit" />
<TextView
android:id="@+id/tv_left_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/iv_rabbit"
android:background="@drawable/content_left_bg"
android:gravity="center"
android:text="开饭啦!"
android:textColor="@android:color/white"
android:visibility="gone" />
</RelativeLayout>
</RelativeLayout>
对应的逻辑java代码
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 MainActivity62 extends AppCompatActivity {
private ImageView image;
private TextView tv_left_content, tv_right_content;
private MyBroadcastReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main62);
init();
}
private void init() {
image = findViewById(R.id.image);
tv_left_content = findViewById(R.id.tv_left_content);
tv_right_content = findViewById(R.id.tv_right_content);
receiver = new MyBroadcastReceiver();
String action = "Open_Rice";
IntentFilter intentFilter = new IntentFilter(action);
registerReceiver(receiver, intentFilter);
image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
tv_right_content.setText("开饭啦!");
Intent intent = new Intent();
intent.setAction("Open_Rice");
sendBroadcast(intent);
}
});
}
class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("Open_Rice")) {
tv_left_content.setVisibility(View.VISIBLE);
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}
数鸭子的界面代码
<?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/count_ducks_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="wrap_content"
android:layout_height="wrap_content"
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>
对应的逻辑Java代码
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;
//相比无序广播,有序广播的广播效率较低,但此类型是有先后顺序的,并可被拦截。
//同样的 继承BroadcastReceiver
//动态注册MyReceiver广播
//MyReceiver one = new MyReceiver ();
//IntentFilter filter = new IntentFilter();
数值越大,优先级越高。如果两个广播接收者的优先级相同,则先注册的广播接收者优先级高。
//filter.setPriority(1000);
//filter.addAction("Intercept_Stitch");
//registerReceiver(one,filter);
public class MainActivity63 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_main63);
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); //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
//这里与无序广播会有不同 sendBroadcast方法为发送无序
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);
}
//同样的 继承BroadcastReceiver 重写onReceive方法 当接收时控制图片、鸭子数量等
private int num = 0; // 存放接收到广播消息时鸭子图片上方需要显示的序号
class MyBroadcastReceiverOne extends BroadcastReceiver {
@Override
// 用于接收程序发送的有序广播
public void onReceive(Context context, Intent intent) {
tv_one.setVisibility(View.VISIBLE); //将第一只鸭子图片上方的序号控件tv_one设置为显示状态
num = num + 1;
tv_one.setText(num + ""); //将变量num显示到控件tv_one上
Log.i("BroadcastReceiverOne", "广播接收者One,接收到了广播消息");
delay(); //将广播消息延迟500毫秒后传递到下一个广播接收者中
}
}
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");
// 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 {
@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();
//终结广播,若在第一只鸭子中执行 二和三都不会接收到广播 终结后面执行的广播 根据优先级
// abortBroadcast();
}
}
/**
* 延迟500毫秒
*/
private void delay() {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(one);
unregisterReceiver(two);
unregisterReceiver(three);
}
}