Android 从开放API HTTP连接并获取JSON响应
我一直试图通过自己的教程、文档和搜索问题来解决这个问题,但我找不到解决方案。我已经通过教程进行了连接,但我一直在尝试连接到API。 这个我一直试图得到一个结果,但我没有足够的知识在这方面解决它自己。我发布了我是如何尝试实现它的问题:如何获得JSON响应?如果您需要更多信息,我将更新我的问题。如果你认为这是一个糟糕的问题,为什么我可以纠正自己Android 从开放API HTTP连接并获取JSON响应,android,http,androidhttpclient,Android,Http,Androidhttpclient,我一直试图通过自己的教程、文档和搜索问题来解决这个问题,但我找不到解决方案。我已经通过教程进行了连接,但我一直在尝试连接到API。 这个我一直试图得到一个结果,但我没有足够的知识在这方面解决它自己。我发布了我是如何尝试实现它的问题:如何获得JSON响应?如果您需要更多信息,我将更新我的问题。如果你认为这是一个糟糕的问题,为什么我可以纠正自己 public class JSONTesting extends ActionBarActivity { /* Example displ
public class JSONTesting extends ActionBarActivity {
/*
Example displayed on site: scala/exercise [master] http http://localhost:9000/exercises/category/forearms
HTTP/1.1 200 OK
Content-Length: 1606
Content-Type: application/json
**Search
List All Exercises: http http://localhost:9000/exercises/
Search By Muscle Group: http http://localhost:9000/exercises/category/forearms
Search By Letter: http http://localhost:9000/exercises/a
*/
TextView textView;
String LINK = "http://10.0.3.2:9000/exercises/"; //Genymotion (10.0.3.2)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsontesting);
textView = (TextView) findViewById(R.id.textView);
new HttpAsyncTask().execute(LINK + "");
}
public static String GET(String url) {
InputStream inputStream = null;
String result = "";
try {
// create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// make GET request to the given URL
HttpGet httpget = new HttpGet(url);
httpget.setHeader("Content-Type", "application/json");
HttpResponse httpResponse = httpclient.execute(httpget);//HostConnection::get() New Host Connection established 0xa4816120, tid 1602
// receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// convert inputstream to string
if (inputStream != null) {
result = convertInputStreamToString(inputStream);
} else {
result = "Did not work!";
}
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
String result = "";
while ((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Received!", Toast.LENGTH_LONG).show();
textView.setText(result);
}
}
// check network connection
public boolean isConnected() { // Returns Connected
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
}
公共类JSONTesting扩展了ActionBarActivity{
/*
站点上显示的示例:scala/exercise[master]httphttp://localhost:9000/exercises/category/forearms
HTTP/1.1200ok
内容长度:1606
内容类型:application/json
**搜寻
列出所有练习:httphttp://localhost:9000/exercises/
按肌肉组搜索:httphttp://localhost:9000/exercises/category/forearms
按字母搜索:httphttp://localhost:9000/exercises/a
*/
文本视图文本视图;
字符串链接=”http://10.0.3.2:9000/exercises/“;//Genymotion(10.0.3.2)
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsontesting);
textView=(textView)findViewById(R.id.textView);
新建HttpAsyncTask()。执行(链接+“”);
}
公共静态字符串获取(字符串url){
InputStream InputStream=null;
字符串结果=”;
试一试{
//创建HttpClient
HttpClient HttpClient=新的DefaultHttpClient();
//对给定URL发出GET请求
HttpGet HttpGet=新的HttpGet(url);
setHeader(“内容类型”、“应用程序/json”);
HttpResponse HttpResponse=httpclient.execute(httpget);//主机连接::get()新主机连接已建立0xa4816120,tid 1602
//作为inputStream接收响应
inputStream=httpResponse.getEntity().getContent();
//将inputstream转换为字符串
如果(inputStream!=null){
结果=convertInputStreamToString(inputStream);
}否则{
结果=“不起作用!”;
}
}捕获(例外e){
d(“InputStream”,例如getLocalizedMessage());
}
返回结果;
}
私有静态字符串convertInputStreamToString(InputStream InputStream)引发IOException{
BufferedReader BufferedReader=新的BufferedReader(新的InputStreamReader(inputStream));
字符串行=”;
字符串结果=”;
而((line=bufferedReader.readLine())!=null)
结果+=行;
inputStream.close();
返回结果;
}
私有类HttpAsyncTask扩展了AsyncTask{
@凌驾
受保护的字符串doInBackground(字符串…URL){
返回GET(url[0]);
}
//onPostExecute显示异步任务的结果。
@凌驾
受保护的void onPostExecute(字符串结果){
Toast.makeText(getBaseContext(),“Received!”,Toast.LENGTH_LONG.show();
setText(结果);
}
}
//检查网络连接
public boolean isConnected(){//返回Connected
ConnectivityManager connMgr=(ConnectivityManager)getSystemService(this.CONNECTIVITY_服务);
NetworkInfo NetworkInfo=connMgr.getActiveNetworkInfo();
if(networkInfo!=null&&networkInfo.isConnected())
返回true;
其他的
返回false;
}
}
更新
public class JSONTesting extends ActionBarActivity {
TextView textView;
String LINK = "http://10.0.3.2:9000/exercises/"; //Genymotion (10.0.3.2)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsontesting);
textView = (TextView) findViewById(R.id.textView);
new HttpAsyncTask().execute(LINK);
}
public static String GET(String url) {
JSONArray finalResult = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
BufferedReader reader = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent(), "UTF-8"));
StringBuilder builder = new StringBuilder();
for (String line = null; (line = reader.readLine()) != null; ) {
builder.append(line).append("\n");
}
JSONTokener tokener = new JSONTokener(builder.toString());
finalResult = new JSONArray(tokener); //This is your JSON result
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
return finalResult.toString();
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Received!", Toast.LENGTH_LONG).show();
textView.setText(result);
}
}
}
公共类JSONTesting扩展了ActionBarActivity{
文本视图文本视图;
字符串链接=”http://10.0.3.2:9000/exercises/“;//Genymotion(10.0.3.2)
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsontesting);
textView=(textView)findViewById(R.id.textView);
新建HttpAsyncTask().execute(链接);
}
公共静态字符串获取(字符串url){
JSONArray finalResult=null;
试一试{
DefaultHttpClient httpClient=新的DefaultHttpClient();
HttpGet HttpGet=新的HttpGet(url);
HttpResponse HttpResponse=httpClient.execute(httpGet);
BufferedReader=新的BufferedReader(新的InputStreamReader(httpResponse.getEntity().getContent(),“UTF-8”);
StringBuilder=新的StringBuilder();
for(String line=null;(line=reader.readLine())!=null;){
builder.append(行).append(“\n”);
}
JSONTokener tokener=新的JSONTokener(builder.toString());
finalResult=newJSONArray(令牌);//这是您的JSON结果
}捕获(例外e){
d(“InputStream”,例如getLocalizedMessage());
}
返回finalResult.toString();
}
私有类HttpAsyncTask扩展了AsyncTask{
@凌驾
受保护的字符串doInBackground(字符串…URL){
返回GET(url[0]);
}
@凌驾
受保护的void onPostExecute(字符串结果){
Toast.makeText(getBaseContext(),“Received!”,Toast.LENGTH_LONG.show();
setText(结果);
}
}
}
这是我用来从HttpResponse
对象获取JSON响应的代码片段。尝试将GET
方法更改为此
public static String GET(String url) {
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
StringBuilder builder = new StringBuilder();
for (String line = null; (line = reader.readLine()) != null;) {
builder.append(line).append("\n");
}
JSONTokener tokener = new JSONTokener(builder.toString());
JSONArray finalResult = new JSONArray(tokener); //This is your JSON result
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
return finalResult.toString();
}
这里出了什么问题,它崩溃了吗?@Marcus我知道我想我会发布它,因为这是我得到的唯一回应。它没有崩溃。它实际上没有显示任何内容。HttpResponse response=httpclient.execute(httpget);我应该像这样实现响应吗?D/InputStream﹕ 拒绝连接到。我刚把这个放进去