后台应用服务弹自定义Toast框

本文主要是介绍后台应用服务弹自定义Toast框，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

之前看到自己的手机应用突然会弹出一个提示框感到有点神奇，不知道是怎么做到的，后面才了解到是后台服务弹的。后台服务弹Toast框其实跟Activity界面差不多，下面先来看看项目SimpleJarService结构：

├── AndroidManifest.xml
├── Android.mk
├── libs
│ ├── android-support-v4.jar
│ ├── fw.jar
│ └── simple.jar
├── res
│ ├── drawable
│ │ └── common_toast_bg.xml
│ ├── drawable-hdpi
│ │ └── ic_launcher.png
│ ├── drawable-ldpi
│ ├── drawable-mdpi
│ │ └── ic_launcher.png
│ ├── drawable-xhdpi
│ │ └── ic_launcher.png
│ ├── layout
│ │ └── common_toast_custom.xml
│ ├── values
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ ├── values-v11
│ │ └── styles.xml
│ └── values-v14
│ └── styles.xml
└── src
└── com
└── china
└── service
├── BootReceiverBroadcast.java
├── Logger.java
├── SimpleControl.java
└── SimpleService.java

SimpleJarService项目在《在Android系统中实现AIDL 自定义对象传递》文章中有介绍，现在主要是在SimpleControl.java类实现实现弹Toast框的方法，而SimpleControl.java类是在SimpleService.java中实例化的。如下：

package com.china.service;import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;import com.china.jar.VoiceChangedListener;
import com.chinatsp.service.R;public class SimpleControl {private static VoiceChangedListener changedListener;private static Context mContext;public SimpleControl(VoiceChangedListener voiceChangedListener, Context context){changedListener = voiceChangedListener;mContext = context;}//获取初始化后的回调实例public static VoiceChangedListener getVoiceCallBack(){return changedListener;}static long lastshowToastTime = 0;public static void showToast(String s) {if(Math.abs(System.currentTimeMillis() - lastshowToastTime)<3000){return; //如果两次要求弹Toast框的时间间隔小于3秒，就不执行第二次弹框}Logger.d("show Toast");View view = LayoutInflater.from(mContext.getApplicationContext()).inflate(R.layout.common_toast_custom,null);WindowManager wm = (WindowManager) mContext.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(width / 2, ViewGroup.LayoutParams.WRAP_CONTENT);TextView txt = (TextView) view.findViewById(R.id.textViewToastMsg);txt.setText(s);txt.setLayoutParams(layoutParams);Toast toast = new Toast(mContext.getApplicationContext());toast.setView(view);toast.setGravity(Gravity.CENTER, 0, 0);toast.setDuration(3000);toast.show();lastshowToastTime = System.currentTimeMillis();}
}

package com.china.service;import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteCallbackList;
import android.os.RemoteException;
import android.os.ServiceManager;import com.china.jar.IVoiceCallBackInterface;
import com.china.jar.IVoiceClientInterface;
import com.china.jar.StudentInfo;
import com.china.jar.VoiceChangedListener;
import com.china.jar.VoiceManager;public class SimpleService extends Service{private static VoiceClientInterfaceImpl mBinder;@Overridepublic IBinder onBind(Intent intent) {Logger.d();return mBinder;//跟客户端绑定}@Overridepublic void onCreate() {super.onCreate();Logger.d();if (null == mBinder){initService();}}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Logger.d();if (null == mBinder){initService();}return START_STICKY;}//实现AIDL的接口private class VoiceClientInterfaceImpl extends IVoiceClientInterface.Stub{protected RemoteCallbackList<IVoiceCallBackInterface> mRemoteCallbackList = new RemoteCallbackList<IVoiceCallBackInterface>();private SimpleControl control;public VoiceClientInterfaceImpl(){control = new SimpleControl(voiceChangedListener, SimpleService.this);//实例化SimpleControl对象}@Overridepublic void face() throws RemoteException {Logger.d("face----excute!");//客户端调用face方法时这里会执行，会打印face----excute!}//注册回调@Overridepublic void registerCallBack(IVoiceCallBackInterface arg0)throws RemoteException {Logger.d();mRemoteCallbackList.register(arg0);}//注销回调@Overridepublic void unRegisterCallBack(IVoiceCallBackInterface arg0)throws RemoteException {Logger.d();mRemoteCallbackList.unregister(arg0);}//调用回调方法private VoiceChangedListener voiceChangedListener = new VoiceChangedListener() {@Overridepublic void openAppByVoice(String arg0) {Logger.d("arg0 = " + arg0);int len = mRemoteCallbackList.beginBroadcast();for (int i = 0; i <len; i++) {try {mRemoteCallbackList.getBroadcastItem(i).openAppByVoice(arg0);} catch (RemoteException e) {e.printStackTrace();}}mRemoteCallbackList.finishBroadcast();}};@Overridepublic void registerUser(StudentInfo studentInfo) throws RemoteException {Logger.d("name = " + studentInfo.getName() + " ,age = " + studentInfo.getAge());}}//初始化服务，主要是向系统注册服务private void initService(){Logger.d();if (null == mBinder){synchronized (SimpleService.class) {if (null == mBinder){try {mBinder = new VoiceClientInterfaceImpl();ServiceManager.addService(VoiceManager.NAME, mBinder);} catch (Exception e) {e.printStackTrace();}}}}}}

可以看到SimpleControl实例化放到了SimpleService类中的内部类VoiceClientInterfaceImpl中实例化，其实也可以放到onCreate()方法中实例化，由于该项目之前是用于aidl的功能实现，所以会放到VoiceClientInterfaceImpl类中实例化。

common_toast_custom.xml是自定义一个布局，用于规范Toast的大小及风格，具体如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/dialogAera"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/common_toast_bg"android:clickable="true"android:gravity="center"android:minHeight="285.0px"android:minWidth="871.0px"android:orientation="horizontal"><TextViewandroid:id="@+id/textViewToastMsg"style="@style/shadowStyle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:gravity="center"android:singleLine="true"android:textColor="@color/common_text_dark"android:textSize="28sp" /></LinearLayout>

通过发送接收广播的方式来测试showToast(String s)方法的功能。具体实现如下：

package com.china.service;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;public class BootReceiverBroadcast extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {Logger.d();Intent service = new Intent(context, SimpleService.class);//开机启动会拉起服务SimpleServicecontext.startService(service);if(intent.getAction().equals("android.intent.gunder.SimpleJar")){//android.intent.gunder.SimpleJar属于自定义actionLogger.d(intent.getAction());SimpleControl.getVoiceCallBack().openAppByVoice("nihao");//这里模拟调用penAppByVoice方法SimpleControl.showToast("你好，我是Service里面的Toast！");//这里模拟调用showToast方法}}
}

测试结果如下：