java - Android Studio 中的Service问题

问题描述

新手，在学习Service一开始就碰到了问题是根据教程做的，在开启服务时闪退MyService.java

package com.example.administrator.myhhhhh;

import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;

public class MyService extends Service {

public MyService() {}@Overridepublic void onCreate() { Log.i('LOG','onCreat'); super.onCreate();}@Overridepublic IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException('Not yet implemented');}

}

MainActivity.java

package com.example.administrator.myhhhhh;

import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

private Button start,stop;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button start=(Button)findViewById(R.id.button); Button stop=(Button)findViewById(R.id.button2); start.setOnClickListener(this); stop.setOnClickListener(this);}@Overridepublic void onClick(View v) { Intent intent=new Intent('MyService'); switch (v.getId()){case R.id.button: startService(intent); break;case R.id.button2: stopService(intent); break; }}

}

Manifest.xml<?xml version='1.0' encoding='utf-8'?><manifest xmlns:android='http://schemas.android.com/apk/res/android'

package='com.example.administrator.myhhhhh'><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'> <activity android:name='.MainActivity'><intent-filter> <action android:name='android.intent.action.MAIN' /> <category android:name='android.intent.category.LAUNCHER' /></intent-filter> </activity> <serviceandroid:name='.MyService'><intent-filter> <action android:name='MyService'/></intent-filter> </service></application>

</manifest>

Logcat 错误提示：05-04 21:28:44.377 21214-21214/com.example.administrator.myhhhhh E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.administrator.myhhhhh, PID: 21214 java.lang.IllegalArgumentException: Service Intent must be explicit: Intent { act=MyService } at android.app.ContextImpl.validateServiceIntent(ContextImpl.java:1851) at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1880) at android.app.ContextImpl.startService(ContextImpl.java:1864) at android.content.ContextWrapper.startService(ContextWrapper.java:516) at com.example.administrator.myhhhhh.MainActivity.onClick(MainActivity.java:26) at android.view.View.performClick(View.java:4918) at android.view.View$PerformClick.run(View.java:20399) at android.os.Handler.handleCallback(Handler.java:815) at android.os.Handler.dispatchMessage(Handler.java:104) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5871) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1119) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)

05-04 21:28:44.434 21214-21214/com.example.administrator.myhhhhh I/Process: Sending signal. PID: 21214 SIG: 9

问题解答

Intent intent=new Intent('MyService');什么鬼？这个不管什么版本的android系统都无法调起来的，service启动的方式分文两种,显示调用和隐式调用：

1）显示启动:

Intent intent=new Intent(MainActivity.this,MyService.class);

通过class调起service,

2）隐式启动:

Intent intent=new Intent('com.example.administrator.myhhhhh.MyService');

里面是service类的绝对路径(带有包名部分),需要注意的是隐式启动在android最新版本(5.0以上)已经被弃用(由于安全问题)，你需要对他进行一些额外的处理(通过action获取它的ComponentName属性)，以下提供你一个方式，代码如下:

protected static synchronized void startService(Context context,String action){LogUtils.debug('startHeartBeatService.');if (context==null){ throw new NullPointerException('context must not be null.');}//add Urgent listener service.Intent mIntent=new Intent();mIntent.setAction(action);PackageManager pm = context.getPackageManager();List<ResolveInfo> resolveInfo = pm.queryIntentServices(mIntent, 0);// Make sure only one match was foundif (resolveInfo == null || resolveInfo.size() != 1) { LogUtils.debug('not found action like this ’com.hll.push.heartbeat’'); return;}// Get component info and create ComponentNameResolveInfo serviceInfo = resolveInfo.get(0);String packageName = serviceInfo.serviceInfo.packageName;String className = serviceInfo.serviceInfo.name;ComponentName component = new ComponentName(packageName, className);// Create a new intent. Use the old one for extras and such reuseIntent explicitIntent = new Intent(mIntent);// Set the component to be explicitexplicitIntent.setComponent(component);context.startService(explicitIntent); }

祝你好运～

Intent intent=new Intent(this,MyService.class);回答3：

自己的intent写错了