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我想以編程方式將第一個圖像的谷歌搜索，把它放到我的android應用程序。我發現，對我來說（這裏：https://developers.google.com/image-search/v1/jsondevguide?hl=it#using_json）做出了表率，但我有不同尋常的部分（部分使用JSON）之前的問題...... 這是我的代碼：在android上的URLConnection
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView webview = new WebView(this);
setContentView(webview);
String s = "ciao";
try {
URL strana = new URL("https://ajax.googleapis.com/ajax/services/search/images?"
+ "v=1.0&q=barack%20obama&userip=INSERT-USER-IP");
HttpURLConnection urlConnection = (HttpURLConnection) strana
.openConnection();
urlConnection.setDoOutput(true);
String line;
StringBuilder builder = new StringBuilder();
InputStreamReader isr = new InputStreamReader(
urlConnection.getInputStream());
BufferedReader reader = new BufferedReader(isr);
while ((line = reader.readLine()) != null) {
builder.append(line);
}
JSONObject json = new JSONObject(builder.toString());
s = json.getJSONObject("responseData").getJSONArray("results")
.getJSONObject(0).getString("url");
} catch (Exception ex) {
ex.printStackTrace();
}
webview.getSettings().setJavaScriptEnabled(true);
String summary = "<html><body>You scored <b>192</b> points." + s
+ "<div></div></body></html>";
webview.loadData(summary, "text/html", null);
}
我有一個問題與捕捉異常之前應用程序處理的最後一行一行「urlConnection.getInputStream（）」，但我不明白爲什麼。 我嘗試使用URLConnection而不是HttpURLConnection（因爲它在之前鏈接的引用中完成），但沒有任何更改。 我還添加了一行「urlConnection.setDoOutput（true）;」希望在一些變化，但沒有。我已經添加到清單中的線
<uses-permission android:name="android.permission.INTERNET" />
所以這不是problem.Here是logcat的：
06-25 09:31:05.840: W/IInputConnectionWrapper(850): showStatusIcon on inactive InputConnection
06-25 09:31:13.975: I/webclipboard(1340): clipservice: [email protected]
06-25 09:31:14.030: D/ApplicationPackageManager(1340): Inside getCSCPackageItemIcon
06-25 09:31:14.040: V/webkit(1340): BrowserFrame constructor: this=Handler (android.webkit.BrowserFrame) {41f288a8}
06-25 09:31:14.080: W/System.err(1340): android.os.NetworkOnMainThreadException
06-25 09:31:14.080: W/System.err(1340): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
06-25 09:31:14.080: W/System.err(1340): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
06-25 09:31:14.080: W/System.err(1340): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
06-25 09:31:14.080: W/System.err(1340): at java.net.InetAddress.getAllByName(InetAddress.java:214)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:461)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:433)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
06-25 09:31:14.080: W/System.err(1340): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
06-25 09:31:14.085: W/System.err(1340): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
06-25 09:31:14.085: W/System.err(1340): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
06-25 09:31:14.085: W/System.err(1340): at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)
06-25 09:31:14.085: W/System.err(1340): at myapp.test.imgseeker.MainActivity.onCreate(MainActivity.java:45)
06-25 09:31:14.085: W/System.err(1340): at android.app.Activity.performCreate(Activity.java:5206)
06-25 09:31:14.085: W/System.err(1340): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
06-25 09:31:14.085: W/System.err(1340): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)
06-25 09:31:14.085: W/System.err(1340): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)
06-25 09:31:14.085: W/System.err(1340): at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-25 09:31:14.085: W/System.err(1340): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
06-25 09:31:14.085: W/System.err(1340): at android.os.Handler.dispatchMessage(Handler.java:99)
06-25 09:31:14.085: W/System.err(1340): at android.os.Looper.loop(Looper.java:137)
06-25 09:31:14.085: W/System.err(1340): at android.app.ActivityThread.main(ActivityThread.java:4921)
06-25 09:31:14.085: W/System.err(1340): at java.lang.reflect.Method.invokeNative(Native Method)
06-25 09:31:14.085: W/System.err(1340): at java.lang.reflect.Method.invoke(Method.java:511)
06-25 09:31:14.085: W/System.err(1340): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
06-25 09:31:14.085: W/System.err(1340): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
06-25 09:31:14.085: W/System.err(1340): at dalvik.system.NativeStart.main(Native Method)
06-25 09:31:14.105: D/WebView(1340): loadUrlImpl: called
06-25 09:31:14.110: D/webcore(1340): CORE loadUrl: called
06-25 09:31:14.110: D/webkit(1340): Firewall not null
06-25 09:31:14.110: D/webkit(1340): euler: isUrlBlocked = false
06-25 09:31:14.160: I/GATE(1340): <GATE-M>DEV_ACTION_COMPLETED</GATE-M>
06-25 09:31:14.190: D/libEGL(1340): loaded /system/lib/egl/libEGL_mali.so
06-25 09:31:14.195: D/libEGL(1340): loaded /system/lib/egl/libGLESv1_CM_mali.so
06-25 09:31:14.205: D/libEGL(1340): loaded /system/lib/egl/libGLESv2_mali.so
06-25 09:31:14.210: D/(1340): Device driver API match
06-25 09:31:14.210: D/(1340): Device driver API version: 10
06-25 09:31:14.210: D/(1340): User space API version: 10
06-25 09:31:14.210: D/(1340): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Thu Oct 25 08:43:05 KST 2012
06-25 09:31:14.250: D/dalvikvm(1340): GC_CONCURRENT freed 250K, 14% free 9538K/11015K, paused 16ms+2ms, total 38ms
06-25 09:31:14.260: D/OpenGLRenderer(1340): Enabling debug mode 0
06-25 09:31:14.265: D/WebView(1340): onSizeChanged - w:480 h:690
06-25 09:31:14.390: D/TilesManager(1340): new EGLContext from framework: 514be150
06-25 09:31:14.390: D/GLWebViewState(1340): Reinit shader
06-25 09:31:14.430: D/GLWebViewState(1340): Reinit transferQueue
http://stackoverflow.com/questions/17272283/getting-json-after-loading-new-view-creates-exception/17272330#17272330。檢查這個使用asynctask。搜索，所以有很多類似的問題。 – Raghunandan
這可能會幫助你http://stackoverflow.com/questions/6976317/android-http-connection-exception –