import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
//声明用到的组件
private Button getVersionBtn, cancel;
private EditText userName, userPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//事例画所有控件
getVersionBtn = (Button) this.findViewById(R.id.yes);
cancel = (Button)this.findViewById(R.id.no);
//给按钮添加监听事件
getVersionBtn.setOnClickListener(onClickListenr);
cancel.setOnClickListener(onClickListenr);
}
/**
* 按钮监听类,处理按钮事件
*/
private View.OnClickListener onClickListenr = new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v.getId() == R.id.yes) {
//要开启一个新的线程,主线程无法获得僌输入流
new Thread(new Runnable() {
@Override
public void run() {
testVersion();
}
}).start();
}
if(v.getId()==R.id.no){
MainActivity.this.finish();
}
}
};
/**
* 自定义一个消息提示窗口
*
* @param msg
*/
private void showDialog(final String msg) {
//回到主线程,否则拿不到msg
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Log.d("LOGCAT", msg);
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(msg).setCancelable(false).setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
// TODO Auto-generated method stub
}
});
AlertDialog alert = builder.create();
alert.show();
} catch (Exception e) {
showDialog(e.getMessage());
}
}
});
}
private void testVersion() {
//要传递的数据
String urlStr = "http://xxxxxxx/version";
try {
URL url = new URL(urlStr);
//获得连接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
//conn.setConnectTimeout(3000);
//conn.setReadTimeout(3000);
if (true) {
//获得输入流
InputStream in = conn.getInputStream();
//创建一个2048字节数的缓冲区
byte[] buffer = new byte[2048];
//在输入流中读取数据并存放到缓冲字节数组中
in.read(buffer);
//将字节转换成字符串
String msg = new String(buffer);
showDialog(msg);
//关闭数据流
in.close();
} else {
//否则就关闭连接
conn.disconnect();
showDialog("连接失败");
}
} catch (Exception e) {
showDialog(e.getMessage());
}
}
}
布局文件:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.shiqi.testwebapi.MainActivity"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test API"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHorizontal_bias="0.279"
app:layout_constraintVertical_bias="0.39" />
<Button
android:id="@+id/yes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yes"
tools:layout_editor_absoluteX="184dp"
android:layout_marginTop="75dp"
app:layout_constraintTop_toBottomOf="@+id/no" />
<Button
android:id="@+id/no"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="no"/>
</LinearLayout>
在AndroieManifest.xml里加上网络权限 ,在application前面:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>