Android Httprequest 不工作
Android Httprequest is not working
我是 android 的新人,在这里我想请求一个网页并获得响应。我已经从教程中编写了这段代码,尽管我写的完全一样,并且我已经在清单文件中授予了 Internet 访问权限,但它不起作用或没有 returning 任何东西。这是调用命名 MainActivity.java 的主要 activity
包裹 com.example.limon.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.txt1);
WebResult web = new WebResult();
String result = "";
try {
result = web.getResult();
} catch (Exception e) {
e.printStackTrace();
}
tv.setText(result);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
>
这是另一个 class return 响应
package com.example.limon.myapplication;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URL;
/**
* Created by Limon on 3/11/2015.
*/
public class WebResult {
public String getResult() throws Exception{
BufferedReader in = null;
String data = null;
try{
HttpClient client = new DefaultHttpClient();
URI website = new URI("http://www.mybringback.com");
HttpGet request = new HttpGet();
request.setURI(website);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while( (l = in.readLine()) != null ){
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
}
finally {
if(in != null){
try{
in.close();
return data;
}catch (Exception e){
e.printStackTrace();
}
}
}
}
}
您是否将互联网权限添加到 android 清单中?
<uses-permission android:name="android.permission.INTERNET" />
不能在主线程中使用所有 http 请求。
阅读:AsyncTask
转到您的项目并打开 AndroidManifest.xml
并包含类似
的代码
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
这将允许与 Internet 交互
尝试将此属性添加到您的 AndroidManifest.xml 以允许所有 HTTP 请求:
android:usesCleartextTraffic="true"
我是 android 的新人,在这里我想请求一个网页并获得响应。我已经从教程中编写了这段代码,尽管我写的完全一样,并且我已经在清单文件中授予了 Internet 访问权限,但它不起作用或没有 returning 任何东西。这是调用命名 MainActivity.java 的主要 activity 包裹 com.example.limon.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.txt1);
WebResult web = new WebResult();
String result = "";
try {
result = web.getResult();
} catch (Exception e) {
e.printStackTrace();
}
tv.setText(result);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
} >
这是另一个 class return 响应
package com.example.limon.myapplication;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URL;
/**
* Created by Limon on 3/11/2015.
*/
public class WebResult {
public String getResult() throws Exception{
BufferedReader in = null;
String data = null;
try{
HttpClient client = new DefaultHttpClient();
URI website = new URI("http://www.mybringback.com");
HttpGet request = new HttpGet();
request.setURI(website);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while( (l = in.readLine()) != null ){
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
}
finally {
if(in != null){
try{
in.close();
return data;
}catch (Exception e){
e.printStackTrace();
}
}
}
}
}
您是否将互联网权限添加到 android 清单中?
<uses-permission android:name="android.permission.INTERNET" />
不能在主线程中使用所有 http 请求。 阅读:AsyncTask
转到您的项目并打开 AndroidManifest.xml
并包含类似
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
这将允许与 Internet 交互
尝试将此属性添加到您的 AndroidManifest.xml 以允许所有 HTTP 请求:
android:usesCleartextTraffic="true"