Question

我正在制作一个必须从JSON对象中读取一些值的Android应用程序。因此，为了获取JSON对象并读取它，我使用了以下方法：

private void _init() {
    _rates = new HashMap<String, String>();

    URLConnection jsonURL = null;
    InputStream in = null;
    String jRatesStream = null;

    try {
        jsonURL = new URL(jRatesURL).openConnection();
        jsonURL.connect(); // ERROR OCCURING HERE
        in = jsonURL.getInputStream();
        jRatesStream = _convertStreamToString(in);

    } catch(Exception e) {
        Log.v("ERROR", "ERROR WHILE READING URL", e);

    } finally {
        try {
            in.close();
        } catch (Exception e) {
        }
    }

    try {
        JSONObject jObject = new JSONObject(jRatesStream);
        JSONObject jRates = jObject.getJSONObject("rates");

        Iterator<String> iterator = jRates.keys();
        while(iterator.hasNext()) {
            String key = iterator.next();
            _rates.put(key, String.valueOf(jRates.getDouble(key)));
        }

    } catch (Exception e) {
    }

}

jRatesURL字符串是这样的：

private static final String jRatesURL = "http://openexchangerates.org/latest.json";

但是在执行此方法时，我收到“Permission Denied”错误：

ERROR WHILE READING URL
java.net.SocketException: Permission denied
    at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocketImpl(Native Method)
    at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocket(OSNetworkSystem.java:186)
    at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:265)
    at java.net.Socket.checkClosedAndCreate(Socket.java:873)
    at java.net.Socket.connect(Socket.java:1020)
    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:62)
    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:88)
    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHTTPConnection(HttpURLConnectionImpl.java:927)
    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:909)
    at com.testing.exchangerates.Rates._init(Rates.java:45)
    at com.testing.exchangerates.Rates.<init>(Rates.java:27)
    at com.testing.exchangerates.HomeActivity.onCreate(HomeActivity.java:27)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
    at android.app.ActivityThread.access$2300(ActivityThread.java:125)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:4627)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    at dalvik.system.NativeStart.main(Native Method)

那么这个错误的原因是什么？连接到JSON链接时我做错了吗？

任何帮助非常感谢。谢谢！

Answer 1

来自here

字符串INTERNET允许应用程序打开网络套接字。

在清单中使用该权限

 <uses-permission android:name="android.permission.INTERNET"></uses-permission>

Answer 2

您是否已获得许可

<uses-permission android:name="android.permission.INTERNET" />

清单中的

？

为什么我收到“权限被拒绝”错误？

2 个答案: