android 获取网页代码

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<EditText
android:id="@+id/et_path"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入路径"
android:text="http://192.168.1.134:8080/" />

<Button
android:id="@+id/bt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="click"
android:text="查看html" />

<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<LinearLayout
android:id="@+id/ll_loading"
android:visibility="invisible"
android:gravity="center"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正在获取数据...." />
</LinearLayout>

<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="none" >

<TextView
android:id="@+id/tv_content"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</ScrollView>
</FrameLayout>

</LinearLayout>

StreamTools.java
package com.itheima.htmlviewer;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamTools {

/**
* 把流里面的内容 转化成字符串
* @param is
* @return
*/
public static String readFromStream(InputStream is){
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024]; // 服务器返回的 0011 gbk的方式编码集
int len = 0;
while((len = is.read(buffer))!=-1){
baos.write(buffer, 0, len);
}
is.close();
byte[] result = baos.toByteArray();
String newstr = new String(result);
if(newstr.contains("charset=utf-8")){
return newstr;
}else if(newstr.contains("charset=gbk")){
return new String(result,"gbk");
}

return newstr;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}


MainActivity.java
package com.itheima.htmlviewer;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
protected static final int LOAD_ERROR = 1;
protected static final int LOAD_SUCCESS = 2;
protected static final int LOAD_FINISH = 3;
private EditText et_path;
private TextView tv_content;
private LinearLayout ll_loading;
private Button bt;

private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case LOAD_ERROR:
Toast.makeText(MainActivity.this, "获取数据失败", 1).show();
break;

case LOAD_SUCCESS:
String text = (String) msg.obj;
tv_content.setText(text);
break;
case LOAD_FINISH:
ll_loading.setVisibility(View.INVISIBLE);
bt.setEnabled(true);
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_path = (EditText) findViewById(R.id.et_path);
tv_content = (TextView) findViewById(R.id.tv_content);
ll_loading = (LinearLayout) findViewById(R.id.ll_loading);
bt = (Button) findViewById(R.id.bt);
}

public void click(View view){
final String path = et_path.getText().toString().trim();
if(TextUtils.isEmpty(path)){
Toast.makeText(this, "路径不能为空", 1).show();
return;
}

ll_loading.setVisibility(View.VISIBLE);
bt.setEnabled(false);
new Thread(){
public void run() {
try {
Thread.sleep(5000);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
int code = conn.getResponseCode();
if(code ==200){
InputStream is = conn.getInputStream();
//把他对应的字符串 显示到界面上.
String text = StreamTools.readFromStream(is);
Message msg = Message.obtain();
msg.obj = text;
msg.what = LOAD_SUCCESS;
handler.sendMessage(msg);
}else{
//服务器 资源错误.
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
handler.sendMessage(msg);
}

} catch (Exception e) {
e.printStackTrace();
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
handler.sendMessage(msg);
}finally{
Message msg = Message.obtain();
msg.what = LOAD_FINISH;
handler.sendMessage(msg);
}

};
}.start();

}
}


AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima.htmlviewer"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima.htmlviewer.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>