我正在构建一个应用程序，它将检查json中URL的数据并将其显示在UI中。我创建了一个我想运行Async任务的服务。该服务工作正常，运行正常，我只是无法运行任务。有什么想法吗？
public class Getmonitors extends AsyncTask<Void, Void, Void> {
// Hashmap for ListView
ArrayList<HashMap<String, String>> monitorList;
ProgressDialog pDialog;
@Override
public void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(myActivity.this);
pDialog.setMessage("Please wait...");
Log.v(LOG_TAG, "PLEASE WAIT");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
public Void doInBackground(Void... arg0) {
// Creating service handler class instance
NewWebRequest webreq = new NewWebRequest();
// Making a request to url and getting response
String jsonStr = webreq.makeWebServiceCall(url, NewWebRequest.GET);
monitorList = ParseJSON(jsonStr);
return null;
}
@Override
public void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
// Intent intent = new Intent(MainActivity.this, myService.class);
// startService(intent);
ListAdapter adapter = new SimpleAdapter(
myActivity.this, monitorList,
R.layout.list_item, new String[]{TAG_NAME, TAG_EMAIL,
TAG_STATUS}, new int[]{R.id.name,
R.id.email, R.id.statuslist});
setListAdapter(adapter);
// setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ImageView iv = (ImageView) findViewById(R.id.imageview1);
iv.setVisibility(View.VISIBLE);
new Getmonitors().execute();
iv.setVisibility(View.INVISIBLE);
}
});
//service onDestroy callback method will be called
findViewById(R.id.start_service).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(myActivity.this, myService.class);
startService(intent);
}
});
//service onDestroy callback method will be called
findViewById(R.id.stop_Service).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(myActivity.this, myService.class);
stopService(intent);
}
});
}
}
在服务中：
@Override
public int onStartCommand(final Intent intent, int flags, int startId) {
//Creating new thread for my service
//Always write your long running tasks in a separate thread, to avoid ANR
new Thread(new Runnable() {
@Override
public void run() {
//Your logic that service will perform will be placed here
//In this example we are just looping and waits for 1000 milliseconds in each loop.
for (int i = 0; i < 2; i++) {
try {
Thread.sleep(20000);
} catch (Exception e) {
}
if(isRunning) {
Log.v("WORKS!!!!!!!!!!!!!!", " url");
}
}
//Stop service once it finishes its task
stopSelf();
}
}).start();
return Service.START_STICKY;
}
答案 0 :(得分：0)
这每30秒在另一个任务中运行我的异步任务十次。
主要活动
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
new Getmonitors().execute();
}
ProgressBar progressBar;
private MyBroadcastReceiver myBroadcastReceiver;
private MyBroadcastReceiver_Update myBroadcastReceiver_Update;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar)findViewById(R.id.progressbar);
//prepare MyParcelable passing to intentMyIntentService
String msgToIntentService = "Android-er";
//Start MyIntentService
final Intent intentMyIntentService = new Intent(this, MyIntentService.class);
intentMyIntentService.putExtra(MyIntentService.EXTRA_KEY_IN, msgToIntentService);
startService(intentMyIntentService);
myBroadcastReceiver = new MyBroadcastReceiver();
myBroadcastReceiver_Update = new MyBroadcastReceiver_Update();
//register BroadcastReceiver
IntentFilter intentFilter = new IntentFilter(MyIntentService.ACTION_MyIntentService);
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(myBroadcastReceiver, intentFilter);
IntentFilter intentFilter_update = new IntentFilter(MyIntentService.ACTION_MyUpdate);
intentFilter_update.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(myBroadcastReceiver_Update, intentFilter_update);
}
@Override
protected void onDestroy() {
super.onDestroy();
//un-register BroadcastReceiver
unregisterReceiver(myBroadcastReceiver);
unregisterReceiver(myBroadcastReceiver_Update);
}
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
**new Getmonitors().execute();**
//this is the async task
int update = intent.getIntExtra(MyIntentService.EXTRA_KEY_UPDATE, 0);
progressBar.setProgress(update);
//un-register BroadcastReceiver
unregisterReceiver(myBroadcastReceiver);
unregisterReceiver(myBroadcastReceiver_Update);
myBroadcastReceiver = new MyBroadcastReceiver();
myBroadcastReceiver_Update = new MyBroadcastReceiver_Update();
//register BroadcastReceiver
IntentFilter intentFilter = new IntentFilter(MyIntentService.ACTION_MyIntentService);
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(myBroadcastReceiver, intentFilter);
IntentFilter intentFilter_update = new IntentFilter(MyIntentService.ACTION_MyUpdate);
intentFilter_update.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(myBroadcastReceiver_Update, intentFilter_update);
}
}
public class MyBroadcastReceiver_Update extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
int update = intent.getIntExtra(MyIntentService.EXTRA_KEY_UPDATE, 0);
progressBar.setProgress(update);
}
}
<强> MyIntentService
public static final String ACTION_MyIntentService = "com.example.androidintentservice.RESPONSE";
public static final String ACTION_MyUpdate = "com.example.androidintentservice.UPDATE";
public static final String EXTRA_KEY_IN = "EXTRA_IN";
public static final String EXTRA_KEY_OUT = "EXTRA_OUT";
public static final String EXTRA_KEY_UPDATE = "EXTRA_UPDATE";
String msgFromActivity;
String extraOut;
public MyIntentService() {
super("com");
}
@Override
protected void onHandleIntent(Intent intent) {
//get input
msgFromActivity = intent.getStringExtra(EXTRA_KEY_IN);
extraOut = "Hello: " + msgFromActivity;
for (int x = 0; x <= 10; x++) {
for (int i = 0; i <= 10; i++) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
Log.v("loop", "");
e.printStackTrace();
Intent intentUpdate = new Intent();
intentUpdate.setAction(ACTION_MyUpdate);
intentUpdate.addCategory(Intent.CATEGORY_DEFAULT);
intentUpdate.putExtra(EXTRA_KEY_UPDATE, i);
sendBroadcast(intentUpdate);
}
//send update
Intent intentUpdate = new Intent();
intentUpdate.setAction(ACTION_MyUpdate);
intentUpdate.addCategory(Intent.CATEGORY_DEFAULT);
intentUpdate.putExtra(EXTRA_KEY_UPDATE, i);
sendBroadcast(intentUpdate);
}
//return result
Intent intentResponse = new Intent();
intentResponse.setAction(ACTION_MyIntentService);
intentResponse.addCategory(Intent.CATEGORY_DEFAULT);
intentResponse.putExtra(EXTRA_KEY_OUT, extraOut);
sendBroadcast(intentResponse);
}
}