Android case: web source code viewer

Effect:

 

 

layout:

<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="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入网址" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click"
        android:text="查看" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/tv_result"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </ScrollView>

</LinearLayout>

 

Code:

package org.dreamtech.look;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private EditText et_path;
    private TextView tv_result;

    @Override
    protected  void onCreate (Bundle savedInstanceState) {
         super .onCreate (savedInstanceState);
        setContentView(R.layout.activity_main);

        et_path = (EditText) findViewById(R.id.et_path);

        tv_result = (TextView) findViewById(R.id.tv_result);
    }

    public void click(View v) {
        String path = et_path.getText().toString().trim();
        if ("".equals(path)) {
            Toast.makeText(getApplicationContext(), "URL cannot be empty" , Toast.LENGTH_LONG)
                    .show();
        } else {
            try {
                URL url = new URL(path);
                HttpURLConnection conn = (HttpURLConnection) url
                        .openConnection();
                conn.setRequestMethod("GET");
                conn.setConnectTimeout(5000);
                int code = conn.getResponseCode();
                if (code == 200) {
                    InputStream in = conn.getInputStream();
                    String content = StreamTools.readStream(in);
                    tv_result.setText(content);
                }
            } catch (Exception e) {
                Toast.makeText(getApplicationContext(), "Please check the network connection or the input URL is wrong" ,
                        Toast.LENGTH_LONG).show();
            }
        }

    }
}

 

 

Read stream tool:

package org.dreamtech.look;

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

public class StreamTools {

    public static String readStream(InputStream in) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int len = -1;
        byte[] buffer = new byte[1024];
        while ((len = in.read(buffer)) != -1) {
            baos.write(buffer, 0, len);
        }
        in.close();
        String content = new String(baos.toByteArray());
        return content;
    }

}