我习惯于开发独立的应用程序，你点击，它运行，当你完成后，你退出。
我现在对处理一种新型（不确定这是否是正确的词）应用程序很感兴趣，并且想知道我应该如何去做。我不确定要研究什么，并希望您的建议能帮助我顺利进行。我会告诉你我的想法。
我的应用程序需要在拨号器中执行特殊操作。当用户拨打一个号码并且正在通话时，我希望用户能够按菜单键，并找到一个选项来滚动浏览他们的所有联系人（股票应用程序或我自己的列表我从手机中存储的联系人中抓取），然后选择一个。选择后，该联系人的号码将粘贴到拨号器中（请记住，在通话过程中）。
我当然不希望有一个答案告诉我如何准确地做到这一点，我只需要一些指导，因为我以前从未编写过这种性质的应用程序。最重要的是，是否有可能做我想做的事？
谢谢你。
您需要通过 Android Service或IntentService。服务是一个应用程序组件，可以在后台执行长时间运行的操作，并且不提供用户界面（UI）。
以下示例取自 android 博客，它是Service类的实现
public class HelloService extends Service {
private Looper mServiceLooper;
private ServiceHandler mServiceHandler;
// Handler that receives messages from the thread
private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
// Normally we would do some work here, like download a file.
// For our sample, we just sleep for 5 seconds.
long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
// Stop the service using the startId, so that we don't stop
// the service in the middle of handling another job
stopSelf(msg.arg1);
}
}
@Override
public void onCreate() {
// Start up the thread running the service. Note that we create a
// separate thread because the service normally runs in the process's
// main thread, which we don't want to block. We also make it
// background priority so CPU-intensive work will not disrupt our UI.
HandlerThread thread = new HandlerThread("ServiceStartArguments",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
// Get the HandlerThread's Looper and use it for our Handler
mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
// For each start request, send a message to start a job and deliver the
// start ID so we know which request we're stopping when we finish the job
Message msg = mServiceHandler.obtainMessage();
msg.arg1 = startId;
mServiceHandler.sendMessage(msg);
// If we get killed, after returning from here, restart
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
// We don't provide binding, so return null
return null;
}
@Override
public void onDestroy() {
Toast.makeText(this, "service done", Toast.LENGTH_SHORT).show();
}
}
另一方面，同样的事情可以使用IntentService来实现，IntentService 是按需处理异步请求的服务的基类。
public class HelloIntentService extends IntentService {
/**
* A constructor is required, and must call the super IntentService(String)
* constructor with a name for the worker thread.
*/
public HelloIntentService() {
super("HelloIntentService");
}
/**
* The IntentService calls this method from the default worker thread with
* the intent that started the service. When this method returns, IntentService
* stops the service, as appropriate.
*/
@Override
protected void onHandleIntent(Intent intent) {
// Normally we would do some work here, like download a file.
// For our sample, we just sleep for 5 seconds.
long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
}
}
You can also go through SO post https://stackoverflow.com/a/4353653/432903
如果您的应用程序主要不是用 javascript/webview/phonegap 编写的，那么您所要做的就是查看 Service 类。该课程和链接的文档会告诉您您需要知道的一切。
maybe you can use an IntentFilter so you can get a system notify when the user uses a dialer. and you should learn the Service component which can work in background in android.