本文实例讲述了android实现读写json数据的方法。分享给大家供大家参考。具体如下：
1. 解析json：
我要评论
package de.vogella.android.twitter.json;
import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstream;
import java.io.inputstreamreader;
import org.apache.http.httpentity;
import org.apache.http.httpresponse;
import org.apache.http.statusline;
import org.apache.http.client.clientprotocolexception;
import org.apache.http.client.httpclient;
import org.apache.http.client.methods.httpget;
import org.apache.http.impl.client.defaulthttpclient;
import org.json.jsonarray;
import org.json.jsonobject;
import android.app.activity;
import android.os.bundle;
import android.util.log;
public class parsejson extends activity {
/** called when the activity is first created. */
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
string readtwitterfeed = readtwitterfeed();
try {
jsonarray jsonarray = new jsonarray(readtwitterfeed);
log.i(parsejson.class.getname(),
"number of entries " + jsonarray.length());
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject jsonobject = jsonarray.getjsonobject(i);
log.i(parsejson.class.getname(), jsonobject.getstring("text"));
}
} catch (exception e) {
e.printstacktrace();
}
}
public string readtwitterfeed() {
stringbuilder builder = new stringbuilder();
httpclient client = new defaulthttpclient();
httpget httpget = new httpget(
"http://twitter.com/statuses/user_timeline/vogella.json");
try {
httpresponse response = client.execute(httpget);
statusline statusline = response.getstatusline();
int statuscode = statusline.getstatuscode();
if (statuscode == 200) {
httpentity entity = response.getentity();
inputstream content = entity.getcontent();
bufferedreader reader = new bufferedreader(
new inputstreamreader(content));
string line;
while ((line = reader.readline()) != null) {
builder.append(line);
}
} else {
log.e(parsejson.class.tostring(), "failed to download file");
}
} catch (clientprotocolexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
return builder.tostring();
}
}
2. 生成json：
public void writejson() {
jsonobject object = new jsonobject();
try {
object.put("name", "jack hack");
object.put("score", new integer(200));
object.put("current", new double(152.32));
object.put("nickname", "hacker");
} catch (jsonexception e) {
e.printstacktrace();
}
system.out.println(object);
}
希望本文所述对大家的android程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
Error running app: Default Activity Not Found
如何用HMS Nearby Service给自己的App添加近距离数据传输功能
BlockChain：2020年7月10日世界人工智能大会WAIC《链智未来 赋能产业区块链主题论坛》(四)
网友评论