Android. 使用HttpClient避免ANR（应用程序无响应）问题
Android. 使用HttpClient避免ANR（应用程序无响应）问题
我的应用程序有一些问题。
市场报告经常出现HttpClient错误的ANR报告。以下是：
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2016)
at org.apache.http.impl.conn.tsccm.WaitingThread.await(WaitingThread.java:159)
at org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(ConnPoolByRoute.java:339)
at org.apache.http.impl.conn.tsccm.ConnPoolByRoute$1.getPoolEntry(ConnPoolByRoute.java:238)
at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager$1.getConnection(ThreadSafeClientConnManager.java:175)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:325)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:580)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:512)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:490)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2022)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:413)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1014)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
at java.lang.Thread.run(Thread.java:1020)
DALVIK线程:
(mutexes: tll=0 tsl=0 tscl=0 ghl=0 hwl=0 hwll=0)
"main" 优先级=5 tid=1 本地线程
| 组="main" sCount=1 dsCount=0 obj=0x40027550 自身=0xcfc0
| sysTid=2557 nice=0 sched=0/0 cgrp=default handle=-1345006240
| schedstat=( 6440246597 181026702867 12047 )
at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)
at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:440)
at java.net.Socket.connect(Socket.java:1013)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465有没有避免这些错误的方法？也许有一些最佳实践，如何使用httpClient？在我的应用程序中，我正在使用：
public ApiImpl() { this.httpClient = new DefaultHttpClient(); ClientConnectionManager mgr = httpClient.getConnectionManager(); HttpParams params = httpClient.getParams(); this.httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager(params, mgr.getSchemeRegistry()), params); } public class Client { private static Api api; private static Client instance = null; public static Client getInstance() { if (instance == null) { instance = new Client(); } return instance; } private Client() { api = new ApiImpl(); }
}
然后在代码中我使用以下内容：
Client client = Client.getInstance(); client.do();
\n\n问题是我没有读取完整的响应体。如果我预期的是布尔值结果，我只会检查响应是否为null。您必须在任何情况下读取响应体，并在Http客户端实例的下一次调用之前关闭响应流。例如\n
InputStream stream = response.getEntity().getContent();
private String streamToString(InputStream is) {
if (is == null) return null;
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
