[英]Access the volume button through my android app
I am developing an android app which should be able to identify when someone press the hardware volume up button of the phone , and give a notification saying "volume up button has pressed". 我正在开发一个Android应用程序,该应用程序应该能够识别何时有人按下了手机的硬件音量调高按钮,并发出通知说“音量调高按钮已按下”。
This is my BroadcastReceiver class. 这是我的BroadcastReceiver类。
package com.example.volumebut;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.view.KeyEvent;
import android.widget.Toast;
public class HardwareButtonReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
KeyEvent e = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if(e.getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP) {
Toast.makeText(context, "volume up button pressed." ,Toast.LENGTH_LONG).show();
}
}
}
This is my manifest file 这是我的清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.volumebut"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.volumebut.MainActivity"
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=".HardwareButtonReceiver">
<intent-filter>
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>
</application>
</manifest>
Since I am new to android development I have no idea how to implement MainActivity.java file. 由于我是android开发的新手,所以我不知道如何实现MainActivity.java文件。
This is the MainActivity.java file I have wrote so far. 这是我到目前为止编写的MainActivity.java文件。 But it gives an error saying "The method registerMediaButtonEventReceiver(HardwareButtonReceiver) is undefined for the type MainActivity"
但是它给出一个错误,指出“对于MainActivity类型,方法registerMediaButtonEventReceiver(HardwareButtonReceiver)未定义”
package com.example.volumebut;
import android.media.AudioManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
HardwareButtonReceiver receiver = new HardwareButtonReceiver();
registerMediaButtonEventReceiver(receiver);
}
}
If you guys can help me to solve my problem I appreciate It much. 如果你们能帮助我解决我的问题,我会非常感激。
You must add method registerMediaButtonEventReceiver
to your activity class. 您必须将方法
registerMediaButtonEventReceiver
添加到您的活动类中。
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.xml_of_your_activity);
HardwareButtonReceiver receiver = new HardwareButtonReceiver();
registerMediaButtonEventReceiver(receiver);
}
private void registerMediaButtonEventReceiver(HardwareButtonReceiver receiver) {
}
}
And then implement it of course. 然后实现它。
http://developer.android.com/reference/android/view/KeyEvent.html http://developer.android.com/reference/android/view/KeyEvent.html
go through above link you will get different key events 通过上面的链接,您将获得不同的关键事件
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
//
}
else if(keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)
{
}
return super.onKeyDown(keyCode, event);
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.