android无法开启广播接收器

 1 package com.mingrisoft.broadcast;
 2 
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 
 9 public class MainActivity extends AppCompatActivity {
10 
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_main);
15 
16         Button btn1 = findViewById(R.id.btn1);
17 
18         btn1.setOnClickListener(new View.OnClickListener() {
19             @Override
20             public void onClick(View v) {
21                 Intent intent = new Intent();
22                 intent.setAction("hemeiwolong");
23                 intent.setPackage("com.mingrisoft.broadcast");　　//没有此句无法启动接收器
24                 sendBroadcast(intent);
25             }
26         });
27     }
28 }

再附上这个小例子的其他代码：

 1 package com.mingrisoft.broadcast;
 2 
 3 import android.app.Activity;
 4 import android.content.BroadcastReceiver;
 5 import android.content.Context;
 6 import android.content.Intent;
 7 import android.widget.Toast;
 8 
 9 public class MyReceiver extends BroadcastReceiver {
10     private String action = "hemeiwolong";
11 
12     @Override
13     public void onReceive(Context context, Intent intent) {
14         if (intent.getAction().equals(action)) {
15             Toast.makeText(context, "hemeiwolong", Toast.LENGTH_SHORT).show();
16         }
17     }
18 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context=".MainActivity">
 8 
 9     <Button
10         android:id="@+id/btn1"
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:text="发送hemeiwolong"/>
14 
15 
16 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.mingrisoft.broadcast">
 4 
 5     <application
 6         android:allowBackup="true"
 7         android:icon="@mipmap/ic_launcher"
 8         android:label="@string/app_name"
 9         android:roundIcon="@mipmap/ic_launcher_round"
10         android:supportsRtl="true"
11         android:theme="@style/AppTheme">
12         <activity android:name=".MainActivity">
13             <intent-filter>
14                 <action android:name="android.intent.action.MAIN" />
15 
16                 <category android:name="android.intent.category.LAUNCHER" />
17             </intent-filter>
18         </activity>
19 
20         <receiver
21             android:name=".MyReceiver"
22             android:enabled="true"
23             android:exported="true">
24 
25             <intent-filter>
26                 <action android:name="hemeiwolong"/>
27             </intent-filter>
28         </receiver>
29     </application>
30 
31 </manifest>