Android中Service的一个Demo例子
Service组件是Android系统重要的一部分,网上看了代码,很简单,但要想熟练使用还是需要Coding。
本文,主要贴代码,不对Service做过多讲解。
代码是从网上找的一个例子,Copy下来发现代码不完全正确,稍微修改了下。
AndroidManifest.xml
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:label="@string/app_name" android:name=".service.ServiceMainActivity" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- 注册Service --> <service android:name="LocalService"> <intent-filter> <action android:name="cn.fansunion.service.LocalService" /> </intent-filter> </service> </application>
ServiceMainActivity.java
package cn.fansunion.service;import cn.fansunion.R;import android.app.Activity;import android.app.Service;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class ServiceMainActivity extends Activity { private Button startBtn; private Button stopBtn; private Button bindBtn; private Button unBindBtn; private static final String TAG = "MainActivity"; private LocalService myService; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.service); startBtn = (Button) findViewById(R.id.start); stopBtn = (Button) findViewById(R.id.stop); bindBtn = (Button) findViewById(R.id.bind); unBindBtn = (Button) findViewById(R.id.unbind); startBtn.setOnClickListener(new MyOnClickListener()); stopBtn.setOnClickListener(new MyOnClickListener()); bindBtn.setOnClickListener(new MyOnClickListener()); unBindBtn.setOnClickListener(new MyOnClickListener()); } class MyOnClickListener implements OnClickListener { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(ServiceMainActivity.this, LocalService.class); switch (v.getId()) { case R.id.start: // 启动Service startService(intent); toast("startService"); break; case R.id.stop: // 停止Service stopService(intent); toast("stopService"); break; case R.id.bind: // 绑定Service bindService(intent, conn, Service.BIND_AUTO_CREATE); toast("bindService"); break; case R.id.unbind: // 解除Service unbindService(conn); toast("unbindService"); break; } } } private void toast(final String tip){ runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(getApplicationContext(), tip, Toast.LENGTH_SHORT).show(); } }); } private ServiceConnection conn = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { Log.e(TAG, "连接成功"); // 当Service连接建立成功后,提供给客户端与Service交互的对象(根据Android Doc翻译的,不知道准确否。。。。) myService = ((LocalService.LocalBinder) service).getService(); } @Override public void onServiceDisconnected(ComponentName name) { Log.e(TAG, "断开连接"); myService = null; } };}
LocalService.java
package cn.fansunion.service;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.util.Log;import android.widget.Toast;public class LocalService extends Service { private static final String TAG = "MyService"; private final IBinder myBinder = new LocalBinder(); @Override public IBinder onBind(Intent intent) { Log.e(TAG, "onBind()"); //Toast.makeText(this, "onBind()", Toast.LENGTH_SHORT).show(); return myBinder; } // 调用startService方法或者bindService方法时创建Service时(当前Service未创建)调用该方法 @Override public void onCreate() { Log.e(TAG, "onCreate()"); //Toast.makeText(this, "onCreate()", Toast.LENGTH_SHORT).show(); } // 调用startService方法启动Service时调用该方法 @Override public void onStart(Intent intent, int startId) { Log.e(TAG, "onStart()"); //Toast.makeText(this, "onStart()", Toast.LENGTH_SHORT).show(); } // Service创建并启动后在调用stopService方法或unbindService方法时调用该方法 @Override public void onDestroy() { Log.e(TAG, "onDestroy()"); //Toast.makeText(this, "onDestroy()", Toast.LENGTH_SHORT).show(); } //提供给客户端访问 public class LocalBinder extends Binder { LocalService getService() { return LocalService.this; } }}
service.xml布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="启动Service" /> <Button android:id="@+id/stop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止Service" /> <Button android:id="@+id/bind" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="绑定Service" /> <Button android:id="@+id/unbind" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="解除Service" /></LinearLayout>
[2015-11-14 17:39:10 - xp2p4android] ------------------------------
[2015-11-14 17:39:10 - xp2p4android] Android Launch!
[2015-11-14 17:39:10 - xp2p4android] adb is running normally.
[2015-11-14 17:39:10 - xp2p4android] Performing cn.fansunion.service.ServiceMainActivity activity launch
[2015-11-14 17:39:10 - xp2p4android] Automatic Target Mode: using device '51bf63f2'
[2015-11-14 17:39:10 - xp2p4android] Uploading xp2p4android.apk onto device '51bf63f2'
[2015-11-14 17:39:10 - xp2p4android] Installing xp2p4android.apk...
[2015-11-14 17:39:13 - xp2p4android] Success!
[2015-11-14 17:39:13 - xp2p4android] Starting activity cn.fansunion.service.ServiceMainActivity on device 51bf63f2
[2015-11-14 17:39:13 - xp2p4android] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=cn.fansunion/.service.ServiceMainActivity }
[2015-11-14 17:39:13 - xp2p4android] Attempting to connect debugger to 'cn.fansunion' on port 8600
运行效果图
原来的代码,Toast对话框没有展示出来。
在CSDN论坛找到一个贴子说,可能是被手机屏蔽了。
我倒是觉得更有可能调用的方式不对。
Service中调用,Toast合适么?
public void onCreate() {
Log.e(TAG, "onCreate()");
//Toast.makeText(this, "onCreate()", Toast.LENGTH_SHORT).show();
}
最后参考网友的办法,在UI线程,新建线程执行Toast。
private void toast(final String tip){
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), tip, Toast.LENGTH_SHORT).show();
}
});
}
不错,是在Activity中调用的。
这充分说明,网上代码再漂亮,还是得动手运行下。
代码的那个贴子,是2011年了,好古老啊~
参考资料
Android中Service组件详解
http://blog.csdn.net/zuolongsnail/article/details/6427037
Android Toast显示不出来
http://bbs.csdn.net/topics/390889540
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- 1楼FansUnion昨天 18:00
- 只有把代码运行了,才知道结果对不对。