我正在尝试使用异步任务解析json，但它显示错误“进程在主线程中执行太多工作”我的代码就在这里..
JSONParser.java -
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
和MainActivity.java是 -
public class FetchData extends AsyncTask<Void,Void,Void>{
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
JSONParser parser=new JSONParser();
JSONObject object=parser.getJSONFromUrl("http://en.wikipedia.org/w/api.php?action=parse&format=json&page=India&prop=sections");
try {
JSONObject pbj1=object.getJSONObject("parse");
JSONArray user=pbj1.getJSONArray("sections");
values1 = new ArrayList<String>();
// anc = new ArrayList<String>();
for(int i=0;i<user.length();i++){
JSONObject ib=user.getJSONObject(i);
lines=ib.getString(TAG_LINE);
// anch=ib.getString(TAG_ANCHOR);
toclevel=ib.getInt("toclevel");
// anchor=ib.getString(TAG_ANCHOR);
if(lines!=null&&toclevel==1){
values1.add(lines);
// anc.add(anch);
}
}
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
bt.setText(values1.get(0));
bt1.setText(values1.get(1));
bt2.setText(values1.get(2));
bt3.setText(values1.get(3));
bt4.setText(values1.get(4));
bt5.setText(values1.get(5));
bt6.setText(values1.get(6));
bt7.setText(values1.get(7));
bt8.setText(values1.get(8));
}
}
public class A implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity1);
read();
//ArrayList<String> bd=getIntent().getStringArrayListExtra("arraylist");
Thread thread=new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
new FetchData().execute();
}
});
thread.start();
//Intent i=getIntent();
//values=i.getStringArrayListExtra("list");
//a=i.getStringExtra("X");
}
private void read() {
// TODO Auto-generated method stub
bt=(Button)findViewById(R.id.his);
//bt.setOnClickListener(new A());
bt.setOnClickListener(new A());
bt1=(Button)findViewById(R.id.bio);
bt1.setOnClickListener(new A());
bt2=(Button)findViewById(R.id.ety);
bt2.setOnClickListener(new A());
bt3=(Button)findViewById(R.id.pol);
bt3.setOnClickListener(new A());
bt4=(Button)findViewById(R.id.eco);
bt4.setOnClickListener(new A());
bt5=(Button)findViewById(R.id.geo);
bt5.setOnClickListener(new A());
bt6=(Button)findViewById(R.id.cul);
bt6.setOnClickListener(new A());
bt7=(Button)findViewById(R.id.mil);
bt7.setOnClickListener(new A());
bt8=(Button)findViewById(R.id.mor);
bt8.setOnClickListener(new A());
}
} 我只想从维基百科中检索印度的内容值表并将其设置在按钮文本上。