Android：广播演示不工作

我是android新手，我正在尝试一个广播演示，我尽了最大的努力阅读文档，但它不起作用。请看一下我的代码：

broadcastedmoactivity.java

package com.broadcastdemo;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class BroadcastDemoActivity extends Activity {
    /** Called when the activity is first created. */
    public static final String PUBLIC_HOLIDAYS = "com.paad.action.PUBLIC_HOLIDAYS";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Intent intent = new Intent(PUBLIC_HOLIDAYS);
        intent.putExtra("Holiday", "8th April is a holiday");
        sendBroadcast(getIntent());
    }
}

package com.broadcastdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class Receive extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        String message = intent.getStringExtra("Holiday");
        Toast.makeText(context, message, Toast.LENGTH_SHORT).show();

    }

}

Receive.java

package com.broadcastdemo;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class BroadcastDemoActivity extends Activity {
    /** Called when the activity is first created. */
    public static final String PUBLIC_HOLIDAYS = "com.paad.action.PUBLIC_HOLIDAYS";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Intent intent = new Intent(PUBLIC_HOLIDAYS);
        intent.putExtra("Holiday", "8th April is a holiday");
        sendBroadcast(getIntent());
    }
}

package com.broadcastdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class Receive extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        String message = intent.getStringExtra("Holiday");
        Toast.makeText(context, message, Toast.LENGTH_SHORT).show();

    }

}

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.broadcastdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".BroadcastDemoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".Receive">
            <intent-filter>               
                <action android:name="com.paad.action.PUBLIC_HOLIDAYS"/>
            </intent-filter>            
        </receiver>
    </application>
</manifest>

---

我知道我遗漏了一些我不知道的东西，请帮助。

我相信您的问题在于呼叫sendBroadcast

    Intent intent = new Intent(PUBLIC_HOLIDAYS);
    intent.putExtra("Holiday", "8th April is a holiday");
    sendBroadcast(getIntent());

您没有发送您构造的意图，而是发送从getIntent（）返回的意图，该意图将是启动活动的意图

应该是

    Intent intent = new Intent(PUBLIC_HOLIDAYS);
    intent.putExtra("Holiday", "8th April is a holiday");
    sendBroadcast(intent);

---

哦，是的，你是对的，现在它起作用了：）那么，是不是有某种隐含的意图开始了我的活动？请给我解释一下，非常感谢你解决了我的问题。您是否注意到在清单中您的活动上设置了意图过滤器？这是主要发射器意图的过滤器。因此，当用户在启动器中单击应用程序的图标时，启动器会构造一个这样的意图并发送它，例如startActivity（），如果我理解错误，请锁定点。在上面的代码中，PUBLIC_HOLIDAYS是一个常量字符串，我将它作为动作参数传递给Intent。动作在manifest.xml中定义，当执行该动作时（即在执行活动的sendBroadcast（intent）方法时），它会在manifest.xml文件中搜索该意图的接收者。现在，由于接收方是Receive.java，并且该类扩展了BroadcastReceivet，因此该控件进入onReceive方法并显示toast消息。我没弄错吧？如果没有，请指出我的错误。