Question

这是我在广播接收器类中的代码

package com.example.manjit.myapplication;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "working!!", Toast.LENGTH_SHORT).show();
    }
}

清单文件包含以下代码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.manjit.myapplication">
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"></action>
            </intent-filter>
        </receiver>
    </application>
</manifest>

我尝试了许多操作代码，例如action android:name="android.intent.action.HEADSET_PLUG"，但是没有显示toast。请帮帮我。我试过在Lolipop上运行

Answer 1

尝试添加两个操作：

<receiver android:name=".MyReceiver"
        android:enabled="true"
        android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
        <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
    </intent-filter>
</receiver>

并改变你的接收器：

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction() == Intent.ACTION_POWER_CONNECTED) {
            Toast.makeText(context, "ACTION_POWER_CONNECTED", Toast.LENGTH_SHORT).show();
        } else if (intent.getAction() == Intent.ACTION_POWER_DISCONNECTED) {
            Toast.makeText(context, "ACTION_POWER_DISCONNECTED", Toast.LENGTH_SHORT).show();
        }
    }
}

为什么广播接收机不工作？我已尝试过在本网站上发布的相当多的解决方案以及其他网站，但它不起作用。帮我

1 个答案: