android json 解析简单实例

public class JsonActivity extends Activity {
private TextView tvJson;
private Button btnJson;
private Button btnJsonMulti;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvJson = (TextView) this.findViewById(R.id.tvJson);
btnJson = (Button) this.findViewById(R.id.btnJson);
btnJsonMulti = (Button) this.findViewById(R.id.btnJsonMulti);
btnJson.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String strUrl = ServerPageUtil.getStrUrl(UrlsOfServer.JSON_SINGER);
//获得返回的Json字符串
String strResult = connServerForResult(strUrl);
//解析Json字符串
parseJson(strResult);
}
});
btnJsonMulti.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String strUrl = ServerPageUtil.getStrUrl(UrlsOfServer.JSON_SINGERS);
String strResult = connServerForResult(strUrl);
//获得多个Singer
parseJsonMulti(strResult);
}
});
}
private String connServerForResult(String strUrl) {
// HttpGet对象
HttpGet httpRequest = new HttpGet(strUrl);
String strResult = "";
try {
// HttpClient对象
HttpClient httpClient = new DefaultHttpClient();
// 获得HttpResponse对象
HttpResponse httpResponse = httpClient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的数据
strResult = EntityUtils.toString(httpResponse.getEntity());
}
} catch (ClientProtocolException e) {
tvJson.setText("protocol error");
e.printStackTrace();
} catch (IOException e) {
tvJson.setText("IO error");
e.printStackTrace();
}
return strResult;
}
// 解析单个Json数据
private void parseJson(String strResult) {
try {
JSONObject jsonObj = new JSONObject(strResult).getJSONObject("singer");
int id = jsonObj.getInt("id");
String name = jsonObj.getString("name");
String gender = jsonObj.getString("gender");
tvJson.setText("ID号"+id + ", 姓名：" + name + ",性别：" + gender);
} catch (JSONException e) {
System.out.println("Json parse error");
e.printStackTrace();
}
}
//解析多个Json的数据
private void parseJsonMulti(String strResult) {
try {
JSONArray jsonObjs = new JSONObject(strResult).getJSONArray("singers");
String s = "";
for(int i = 0; i < jsonObjs.length() ; i++){
JSONObject jsonObj = ((JSONObject)jsonObjs.opt(i))
.getJSONObject("singer");
int id = jsonObj.getInt("id");
String name = jsonObj.getString("name");
String gender = jsonObj.getString("gender");
s += "ID号"+id + ", 姓名：" + name + ",性别：" + gender+ "\n" ;
}
tvJson.setText(s);
} catch (JSONException e) {
System.out.println("Jsons parse error !");
e.printStackTrace();
}
}
}