尝试执行 JSON 查询时出现 AndroidBlockGuardPolicy 错误。看看其他例子，我想使用 AsyncTask，我以为我做到了，但我得到了一个错误......我只是没有看到什么吗？
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pm_article);
context = this;
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectAll()
.penaltyLog()
.penaltyDialog()
.build());
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
// getting product details from intent
Intent i = getIntent();
// getting product id -section id (sid) from intent
//Receive the section id (SID) from th intent
String id = i.getStringExtra(PM_section.INTENT_ID);
id_pub = id;
new GetProductDetails().execute();
}
异步任务
class GetProductDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(PM_article.this);
pDialog.setMessage("Loading product details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected String doInBackground(String... args) {
runOnUiThread(new Runnable() {
public void run () {
SharedPreferences sharedPrefs = PreferenceManager
.getDefaultSharedPreferences(context);
int success;
try {
//sid2.setText("ID: " + id_pub);
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("id", id_pub));
System.out.println("Loading stories into the activity!");
// getting product details by making HTTP request
// Note that product details url will use GET request
JSONObject json = jParser.makeHttpRequest(url_load_article, "GET", params);
System.out.println("Loading stories into the actisadfsafdsafvity!");
// check your log for json response
Log.d("Single Product Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray contentObj = json
.getJSONArray(TAG_PRODUCT); // JSON Array
// get first product object from JSON Array
JSONObject product = contentObj.getJSONObject(0);
// product with this pid found
// Edit Text
art_title = (TextView) findViewById(R.id.display_title);
art_author = (TextView) findViewById(R.id.display_author);
art_publishtime = (TextView) findViewById(R.id.display_date);
art_content = (TextView) findViewById(R.id.display_content);
// display product data in TextView
int text_size = Integer.parseInt(sharedPrefs.getString("prefFontSize", "1"));
art_title.setText(product.getString(TAG_TITLE));
art_title.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+20);
art_author.setText(product.getString(TAG_AUTHOR));
art_author.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+14);
art_publishtime.setText(product.getString(TAG_PUBLISHTIME));
art_publishtime.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+14);
art_content.setText(product.getString(TAG_CONTENT));
art_content.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+18);
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
错误日志
01-06 22:58:42.263: E/AndroidRuntime(23835): FATAL EXCEPTION: main
01-06 22:58:42.263: E/AndroidRuntime(23835): android.os.NetworkOnMainThreadException
01-06 22:58:42.263: E/AndroidRuntime(23835): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
01-06 22:58:42.263: E/AndroidRuntime(23835): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
01-06 22:58:42.263: E/AndroidRuntime(23835): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
01-06 22:58:42.263: E/AndroidRuntime(23835): at java.net.InetAddress.getAllByName(InetAddress.java:214)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
01-06 22:58:42.263: E/AndroidRuntime(23835): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
01-06 22:58:42.263: E/AndroidRuntime(23835): at com.example.pt_layout_test3.JSONParser.makeHttpRequest(JSONParser.java:62)
01-06 22:58:42.263: E/AndroidRuntime(23835): at com.example.pt_layout_test3.PM_article$GetProductDetails$1.run(PM_article.java:180)
01-06 22:58:42.263: E/AndroidRuntime(23835): at android.os.Handler.handleCallback(Handler.java:615)
01-06 22:58:42.263: E/AndroidRuntime(23835): at android.os.Handler.dispatchMessage(Handler.java:92)
01-06 22:58:42.263: E/AndroidRuntime(23835): at android.os.Looper.loop(Looper.java:137)
01-06 22:58:42.263: E/AndroidRuntime(23835): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-06 22:58:42.263: E/AndroidRuntime(23835): at java.lang.reflect.Method.invokeNative(Native Method)
01-06 22:58:42.263: E/AndroidRuntime(23835): at java.lang.reflect.Method.invoke(Method.java:511)
01-06 22:58:42.263: E/AndroidRuntime(23835): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-06 22:58:42.263: E/AndroidRuntime(23835): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-06 22:58:42.263: E/AndroidRuntime(23835): at dalvik.system.NativeStart.main(Native Method)