android查看网页源码（demo）

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需求描述： 输入一个网址，通过网络请求，查看该网页的源码。

运行效果展示

具体实现：

• MainActivity.java

package com.example.www.checkcode;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    private EditText urlCentent;
    private Button mBtnCheck;
    private TextView mTv_content;

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
//            super.handleMessage(msg);
            String content = (String) msg.obj;
            mTv_content.setText(content);
        }
    };


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

        urlCentent = (EditText) findViewById(R.id.et_Url);
        mBtnCheck = (Button) findViewById(R.id.btn_check);
        mTv_content = (TextView) findViewById(R.id.tv_content);
    }

    public void getSourceCode(View v) {
        new Thread(){
            public void run(){
                try {
                    String path = urlCentent.getText().toString().trim();
                    URL url = new URL(path);
                    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                    httpURLConnection.setRequestMethod("GET");
                    httpURLConnection.setConnectTimeout(5000);
                    int responseCode = httpURLConnection.getResponseCode();
                    if(responseCode == 200){
                        InputStream is = httpURLConnection.getInputStream();
                        String content = StreamTools.streamToString(is);


                        Message msg = new Message();
                        msg.obj = content;
                        handler.sendMessage(msg);

                    }
                } catch (Exception e){
                    e.printStackTrace();
                }
            }
        }.start();


    }
}

• activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/et_Url"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:hint="请输入网址"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/btn_check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="查看"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        android:onClick="getSourceCode"
        app:layout_constraintTop_toBottomOf="@+id/et_Url" />

    <ScrollView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btn_check">

        <TextView
            android:id="@+id/tv_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="源代码"
            android:textAlignment="viewStart"
            android:textSize="16sp"
            tools:layout_editor_absoluteX="47dp"
            tools:layout_editor_absoluteY="147dp"
            tools:text="源代码" />
    </ScrollView>

</android.support.constraint.ConstraintLayout>

• 配置文件 AndroidMainifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.www.checkcode">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>