我有一个接收来电号码并执行 AsyncTask 的广播接收器。在 onPreExecute 我创建一个通知让我知道已连接到服务器，在 doInBackground 我发出一个 http 请求以下载一些关于 json 格式的信息。下载完成后，我使用 publishProgress 将下载的信息发送到通知，然后我下载图像，并在 OnPostExecute 上再次发送带有图像的通知。
问题是有时有效，有时无效
我用谷歌搜索了好几天试图找到解决方案，但我找不到：（
我非常感谢任何可以提供帮助的人
编辑：在通知异常出现“java.lang.NullPointerException”
public class SearchContact extends AsyncTask<String, String, Void> {
private Context context;
private NotificationManager manager;
private String dataSearch, resp, data1 = "", data2 = "", data3 = "", data4 = "", data5 = "", data6 = "";
private Boolean json_error, connect_error, has_photo;
private Bitmap default_photo, photo;
public SearchContact(Context context, String search){
this.context = context;
dataSearch = search;
default_photo = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher_small_5);
}
@Override
protected void onPreExecute() {
json_error = true;
connect_error = false;
has_photo = false;
default_photo = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher_small);
manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
super.onPreExecute();
createNotification("Pesquisando " + dataSearch + "...", dataSearch, "Pesquisando...", default_photo); //Searching...
}
@Override
protected Void doInBackground(String... params) {
resp = ""; data1 = ""; data2 = ""; data3 = ""; data4 = ""; data5 = ""; data6 = "";
if (!dataSearch.isEmpty() && dataSearch != null){
json_error = false;
connect_error = false;
has_photo = false;
try {
dataSearch = URLEncoder.encode(dataSearch,
"utf-8");
HttpClient httpClient = new DefaultHttpClient(); //getHttpClient();
HttpGet httpGet = new HttpGet("http://myserver.net/base.php?search=" + dataSearch + "&format=json");
HttpResponse response = httpClient.execute(httpGet);
BufferedReader buf = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer();
String linha;
while ((linha = buf.readLine()) != null){
sb.append(linha);
}
resp = sb.toString();
} catch (Exception e){
connect_error = true;
//publishProgress("Erro ao receber", dataSearch, "Não foi possível estabelecer conexão", "");
}
if (connect_error == false) {
try {
JSONObject json = new JSONObject(resp);
JSONArray contatos = json.getJSONArray("contatos");
if (contatos.getJSONObject(0).has("data1") == true) {
data1 = contatos.getJSONObject(0).getString("data1");
data5 = contatos.getJSONObject(0).getString("data5");
data2 = contatos.getJSONObject(0).getString("data2");
data3 = contatos.getJSONObject(0).getString("data3");
data4 = contatos.getJSONObject(0).getString("data4");
data6 = contatos.getJSONObject(0).getString("data6");
}
} catch (JSONException e) {
json_error = true;
//publishProgress("Erro de JSON", dataSearch, "Não foi possível decodificar JSON", "");
}
if (json_error == false){
publishProgress("» " + data1 + " «", data1, (data3.isEmpty() ? data5 : data3), "");
// ^ HERE, SOMETIMES DOESN'T APPEAR AND FREEZES NOTIFICATION
if (!data2.contentEquals("1")) {
has_photo = true;
try {
photo = BitmapFactory.decodeStream((InputStream) new URL("http://graph.facebook.com/"+ data2 + "/picture?width=250&height=250").getContent());
} catch (Exception e){
has_photo = false;
photo = default_photo;
}
//publishProgress("", data1, (data3.isEmpty() ? data5 : data3), "true");
} else {
photo = default_photo;
has_photo = false;
}
s.putBoolean("has_photo", has_photo);
s.putParcelable("photo", photo);
}
}
}
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
createNotification(values[0], values[1], values[2], photo));
}
@Override
protected void onPostExecute(Void result) {
//if (connect_error) createNotification("Problema de conexão", dataSearch, "Problema de conexão", default_photo);
//else
//if (json_error) createNotification("Número não encontrado!", dataSearch, "Número não encontrado na base de dados", default_photo);
//else
createNotification("» " + data1 + " «", data1, (!data3.isEmpty() ? data3 : data5), default_photo);
super.onPostExecute(result);
}
public void createNotification(String bar, String title, String corpo, Bitmap photo) {
try {
Bitmap resized_photo;
int height = (int) context.getResources().getDimension(android.R.dimen.notification_large_icon_height);
int width = (int) context.getResources().getDimension(android.R.dimen.notification_large_icon_width);
if (!has_photo) resized_photo = photo;
else resized_photo = Bitmap.createScaledBitmap(photo, width, height, false);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context).setSmallIcon(R.drawable.ic_launcher_small);
if (!bar.isEmpty()) builder.setTicker(bar);
if (!title.isEmpty()) builder.setContentTitle(title);
if (!corpo.isEmpty()) builder.setContentText(corpo);
if (has_photo == true) builder.setLargeIcon(resized_photo);
if (has_photo == true){
NotificationCompat.BigPictureStyle big = new NotificationCompat.BigPictureStyle();
big.bigPicture(photo);
big.bigLargeIcon(resized_photo);
big.setBigContentTitle(title);
big.setSummaryText(corpo);
builder.setStyle(big);
}
builder.setContentInfo(data6);
if (!data1.isEmpty()){
Intent i = new Intent(Intent.ACTION_INSERT_OR_EDIT);
i.setType(ContactsContract.Contacts.CONTENT_ITEM_TYPE);
i.putExtra(ContactsContract.Intents.Insert.NAME, title);
i.putExtra(ContactsContract.Intents.Insert.PHONE, dataSearch);
PendingIntent pendingActionAdd = PendingIntent.getActivity(context, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent pendingActionView = PendingIntent.getActivity(context, 0, new Intent(context, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
builder
.addAction(R.drawable.ic_action_add_light, "Adicionar aos contato", pendingActionAdd)
.setContentIntent(pendingActionView);
}
//manager.cancel(R.string.app_name);
manager.notify(R.string.app_name, builder.build());
} catch (Exception e){
e.printStackTrace();
Toast.makeText(context, e.toString(),Toast.LENGTH_SHORT).show();
}
}
}
[第一次通知] 有时在这里冻结，并且不更新...
