GSON和谷歌 [英] Gson and Google
问题描述
我有以下的code:
公共字符串测试(){
网址URL = NULL;
尝试{
URL =新URL(\"http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN\");
}赶上(MalformedURLException的E1){
// TODO自动生成catch块
e1.printStackTrace();
}
读者的BufferedReader = NULL;
字符串x =;
尝试{
读者=新的BufferedReader(新的InputStreamReader(url.openStream(),UTF-8));
为(字符串线;(线= reader.readLine())=无效;!){
的System.out.println(线);
X =线;
}
}赶上(IOException异常五){
// TODO自动生成catch块
e.printStackTrace();
} {最后
如果(!读者= NULL){尝试reader.close();}赶上(IOException异常忽略){
} {}
}
JsonElement根=新JsonParser()解析(X)。
返回X;
}
}
现在我想插入文本分为以下TextView的。
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_create_competetion); TextView的电视=(的TextView)findViewById(R.id.competetion_text);
JsonCollector JC =新JsonCollector(); tv.setText(jc.test());
然而,当我尝试运行它。我得到以下错误:
致命异常:主要
E / AndroidRuntime(1800):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.konkurrencesigner / com.example.konkurrencesigner.CreateCompetetion}:android.os.NetworkOnMainThreadException
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
E / AndroidRuntime(1800):在android.app.ActivityThread.access $ 600(ActivityThread.java:141)
E / AndroidRuntime(1800):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1234)
E / AndroidRuntime(1800):在android.os.Handler.dispatchMessage(Handler.java:99)
E / AndroidRuntime(1800):在android.os.Looper.loop(Looper.java:137)
E / AndroidRuntime(1800):在android.app.ActivityThread.main(ActivityThread.java:5039)
E / AndroidRuntime(1800):在java.lang.reflect.Method.invokeNative(本机方法)
E / AndroidRuntime(1800):在java.lang.reflect.Method.invoke(Method.java:511)
E / AndroidRuntime(1800):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:793)
E / AndroidRuntime(1800):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
E / AndroidRuntime(1800):在dalvik.system.NativeStart.main(本机方法)
E / AndroidRuntime(1800):因:android.os.NetworkOnMainThreadException
E / AndroidRuntime(1800):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
E / AndroidRuntime(1800):在java.net.InetAddress.lookupHostByName(InetAddress.java:385)
E / AndroidRuntime(1800):在java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
E / AndroidRuntime(1800):在java.net.InetAddress.getAllByName(InetAddress.java:214)
E / AndroidRuntime(1800):在libcore.net.http.HttpConnection<&初始化GT;(HttpConnection.java:70)。
E / AndroidRuntime(1800):在libcore.net.http.HttpConnection<&初始化GT;(HttpConnection.java:50)。
E / AndroidRuntime(1800):在libcore.net.http.HttpConnection $ Address.connect(HttpConnection.java:340)
E / AndroidRuntime(1800):在libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
E / AndroidRuntime(1800):在libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
E / AndroidRuntime(1800):在libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
E / AndroidRuntime(1800):在libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
E / AndroidRuntime(1800):在libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
E / AndroidRuntime(1800):在libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
E / AndroidRuntime(1800):在libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
谁能告诉我为什么发生这种情况?
请注意,我已经添加下面一行在我的Android清单:
<使用许可权的android:NAME =android.permission.INTERNET对/>
您是在主线程上做HTTP通信,这就是为什么你得到一个 NetworkOnMainThreadException
。做在一个单独的线程,使用 的AsyncTask
将是一个理想的解决方案,这里是你如何实现它的例子:
私人TextView的电视;@覆盖
保护无效的onCreate(捆绑savedInstanceState){ super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_create_competetion); 电视=(的TextView)findViewById(R.id.competetion_text);
JsonCollector JC =新JsonCollector(); //创建并执行新的AsyncTask,TextView的意志
当任务完成//进行异步更新。
updateTextView();
}私人无效updateTextView(){
新的AsyncTask<太虚,太虚,字符串>(){ @覆盖
/ *运行在独立的线程* /
保护字符串doInBackground(虚空...... PARAMS){
字符串结果= NULL;
读者的BufferedReader = NULL;
尝试{
网址URL =新URL(\"http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN\");
读者=新的BufferedReader(新的InputStreamReader(url.openStream(),UTF-8));
为(字符串线;(线= reader.readLine())=无效;!){
的System.out.println(线);
结果=线;
}
}赶上(例外五){
e.printStackTrace();
} {最后
如果(读者!= NULL){
尝试{
reader.close();
}赶上(IOException异常五){
// 忽视
}
}
} 返回结果;
} @覆盖
/ *运行UI /主线程就当doInBackground()
*已完成* /
保护无效onPostExecute(字符串结果){
如果(结果!= NULL){
//更新的TextView只有当我们得到了一个结果
//从HTTP请求
tv.setText(结果);
}
} }。执行();
}
I have the following code:
public String test(){
URL url = null;
try {
url = new URL("http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
BufferedReader reader = null;
String x = "";
try {
reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
System.out.println(line);
x = line;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if (reader !=null) try{reader.close();} catch (IOException ignore) {
}{}
}
JsonElement root = new JsonParser().parse(x);
return x;
}
}
now i want to insert the text into the following textView.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_competetion);
TextView tv = (TextView) findViewById(R.id.competetion_text);
JsonCollector jc = new JsonCollector();
tv.setText(jc.test());
However when i try to run it. i get the following error:
FATAL EXCEPTION: main
E/AndroidRuntime(1800): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.konkurrencesigner/com.example.konkurrencesigner.CreateCompetetion}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
E/AndroidRuntime(1800): at android.app.ActivityThread.access$600(ActivityThread.java:141)
E/AndroidRuntime(1800): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
E/AndroidRuntime(1800): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(1800): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(1800): at android.app.ActivityThread.main(ActivityThread.java:5039)
E/AndroidRuntime(1800): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(1800): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(1800): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
E/AndroidRuntime(1800): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
E/AndroidRuntime(1800): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(1800): Caused by: android.os.NetworkOnMainThreadException
E/AndroidRuntime(1800): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
E/AndroidRuntime(1800): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
E/AndroidRuntime(1800): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
E/AndroidRuntime(1800): at java.net.InetAddress.getAllByName(InetAddress.java:214)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
E/AndroidRuntime(1800): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
E/AndroidRuntime(1800): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
E/AndroidRuntime(1800): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
Can anyone tell me why this is happening?
please note that i have already added the following line in my android manifest:
<uses-permission android:name="android.permission.INTERNET" />
You are doing HTTP communication on the main thread, that's why you're getting a NetworkOnMainThreadException
. Do it in a separate thread, using an AsyncTask
would be an ideal solution, here's an example of how you could implement it:
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_competetion);
tv = (TextView) findViewById(R.id.competetion_text);
JsonCollector jc = new JsonCollector();
// Create and execute a new AsyncTask, the TextView will
// be updated asynchronously when the task has finished.
updateTextView();
}
private void updateTextView() {
new AsyncTask<Void, Void, String>() {
@Override
/* Runs on a separate thread */
protected String doInBackground(Void... params) {
String result = null;
BufferedReader reader = null;
try {
URL url = new URL("http://api.heroesofnewerth.com/player_statistics/ranked/nickname/Hieratic/?token=0CZGH8ZI7UR8J2GN");
reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
System.out.println(line);
result = line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// Ignore
}
}
}
return result;
}
@Override
/* Runs on the UI/Main thread when doInBackground()
* has finished */
protected void onPostExecute(String result) {
if(result != null) {
// Update the TextView only if we got a result
// from the HTTP request
tv.setText(result);
}
}
}.execute();
}
这篇关于GSON和谷歌的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!