报错为：
01/09 11:01:50: Launching app
$ adb push C:\Users\Administrator\AndroidStudioProjects\MyApplication13\app\build\outputs\apk\app-debug.apk /data/local/tmp/com.example.administrator.myapplication
$ adb shell pm install -r "/data/local/tmp/com.example.administrator.myapplication"
Success
$ adb shell am start -n "com.example.administrator.myapplication/com.example.administrator.myapplication.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Connected to process 2346 on device emulator-5554
W/System: ClassLoader referenced unknown path: /data/app/com.example.administrator.myapplication-1/lib/x86
I/InstantRun: Instant Run Runtime started. Android package is com.example.administrator.myapplication, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.example.administrator.myapplication-1/lib/x86
W/art: Verification of void android.support.v7.app.AppCompatActivity.onSupportActionModeFinished(android.support.v7.view.ActionMode) took 1.372s
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
W/gralloc_ranchu: Gralloc pipe failed
[ 01-09 03:02:02.837 2346: 2346 D/ ]
HostConnection::get() New Host Connection established 0x9daf8380, tid 2346
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
Application terminated.
在权限中，我已经添加了网络权限。
但是不知道为什么就是不行。
源代码如下：
package com.example.administrator.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import static android.icu.lang.UCharacter.GraphemeClusterBreak.V;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
TextView responseText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendRquest=(Button)findViewById(R.id.send_request);
responseText=(TextView)findViewById(R.id.requestion_text);
sendRquest.setOnClickListener(this);
}
public void onClick(View v)
{
if(v.getId()==R.id.send_request)
{
sendResquestWithHttpURLConnection();
}
}
private void sendResquestWithHttpURLConnection()
{
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection=null;
BufferedReader reader=null;
try{
URL url=new URL("http://www.baidu.com");
connection=(HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in=connection.getInputStream();
reader=new BufferedReader(new InputStreamReader(in));
StringBuilder response=new StringBuilder();
String line;
while((line=reader.readLine())!=null)
{
response.append(in);
}
showResponse(response.toString());
}
catch(Exception e)
{
e.printStackTrace();
}
finally {
if(reader!=null){
try{
reader.close();
}catch (IOException e)
{
e.printStackTrace();
}
}
if(connection!=null)
{
connection.disconnect();
}
}
}
}).start();
}
private void showResponse(final String response){
runOnUiThread(new Runnable(){
public void run(){
responseText.setText(response);
}
});
}
}
