Android中实现地址栏输入网址能浏览该地址网页源码并操作访问网络

 
首先实现简单布局：


代码如下:

<EditText
android:id="@+id/et_url"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ems="10"
android:text="@string/url_text" >
<requestFocus android:layout_width="match_parent" />
</EditText>
<Button
android:id="@+id/btn_ie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/et_url"
android:onClick="sendHttp"
android:text="@string/btn_text" />
<ScrollView
android:id="@+id/sv_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/btn_ie" >
<TextView
android:id="@+id/tv_ie"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/ie_text" />
</ScrollView>

在Stirng中


代码如下:

<string name="url_text">http://luochuang.iteye.com/blog/1606231</string>
<string name="btn_text">浏览</string>
<string name="ie_text">显示浏览网页内容</string>

新建类文件 ：
 
首先MainActivity 中代码 ：


代码如下:

public class MainActivity extends Activity {
// 声明控件
public EditText et_url;
public TextView tv_ie;
// 网路操作类
public NetWorkUtils netWorkUtils;
private Handler handler;
public String content;
public static final int TEXT = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取et_url对象
et_url = (EditText) findViewById(R.id.et_url);
tv_ie = (TextView) findViewById(R.id.tv_ie);
// 实例化
netWorkUtils = new NetWorkUtils(this);
// 实例化这个处理者
handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case TEXT:
tv_ie.setText(content);// 设置显示的文本
break;
default:
break;
}
}
};
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void sendHttp(View v) {
// 设置网络
boolean flag = netWorkUtils.setActiveNetWork();
if (flag) {
// run方法 执行完毕 这个线程就消耗了
// 子线程
new Thread(new Runnable() {
@Override
public void run() {
send();
handler.sendEmptyMessage(TEXT);
}
}).start();
}
}
// 发送请求操作
@SuppressLint("NewApi")
public void send() {

// 获取url的path路径
String path = et_url.getText().toString();
if (path.isEmpty()) {
Toast.makeText(MainActivity.this, "访问 的url地址不能为空",
Toast.LENGTH_LONG).show();
} else {
content = HttpUtils.sendGet(path);
}

/*// 设置网络
netWorkUtils.setActiveNetWork();
// 获取url的path路径
String path = et_url.getText().toString();
if (path.isEmpty()) {
Toast.makeText(MainActivity.this, "访问 的url地址不能为空",
Toast.LENGTH_LONG).show();
} else {
try {
// 设置访问的url
URL url = new URL(path);
// 打开请求
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
// 设置请求的信息
httpURLConnection.setRequestMethod("GET");
// 判断服务器是否响应成功
if (httpURLConnection.getResponseCode() == 200) {
// 获取响应的输入流对象
InputStream is = httpURLConnection.getInputStream();
// 字节输出流
ByteArrayOutputStream bops = new ByteArrayOutputStream();
// 读取数据的缓存区
byte buffer[] = new byte[1024];
// 读取长度记录
int len = 0;
// 循环读取
while ((len = is.read(buffer)) != -1) {
bops.write(buffer, 0, len);
}
// 把读取的内容转换成byte数组
byte data[] = bops.toByteArray();
// 把转换成字符串
content = new String(data);
} else {
Toast.makeText(MainActivity.this, "服务器响应错误",
Toast.LENGTH_LONG).show();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}*/
}
}

代码如下:

public class HttpUtils {

public static String sendGet(String path) {
String content = null;
try {
// 设置访问url
URL url = new URL(path);
// 打开请求
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
// 设置请求的信息
httpURLConnection.setRequestMethod("GET");
// 设置请求是否超时时间
httpURLConnection.setConnectTimeout(5000);
// 判断服务器是否响应成功
if (httpURLConnection.getResponseCode() == 200) {
// 获取响应的输入流对象
InputStream is = httpURLConnection.getInputStream();
byte data[] = StreamTools.isToData(is);
// 把转换成字符串
content = new String(data);
// 内容编码方式
if (content.contains("gb2312")) {
content = new String(data, "gb2312");
}
}
// 断开连接
httpURLConnection.disconnect();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return content;
}
}

代码如下:

public class StreamTools {
public static byte[] isToData(InputStream is) throws IOException{

//字节输出流
ByteArrayOutputStream bops = new ByteArrayOutputStream();
//读取数据的缓存区
byte buffer[] = new byte[1024];
//读取长度 的记录
int len = 0;
//循环读取
while((len = is.read(buffer)) != -1){
bops.write(buffer, 0, len);
}
//把读取的内容转换成 byte数组
byte data[] = bops.toByteArray();

return data;

}
}

代码如下:

public class NetWorkUtils {
private Context context;
// 网路链接管理对象
public ConnectivityManager connectivityManager;
public NetWorkUtils(Context context) {
this.context = context;
// 获取网络链接的对象
connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
}
//public void setActiveNetWork() {
public boolean setActiveNetWork() {
boolean flag = false;
// 获取可用的网络链接对象
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo == null) {
new AlertDialog.Builder(context)
.setTitle("网络不可用")
.setMessage("可以设置网络?")
.setPositiveButton("确认",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(context, "点击确认",
Toast.LENGTH_LONG).show();
// 声明意图
Intent intent = new Intent();
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory("android.intent.category.LAUNCHER");
intent.setComponent(new ComponentName(
"com.android.settings",
"com.android.settings.Settings"));
intent.setFlags(0x10200000);
// 执行意图
context.startActivity(intent);
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
// 必须.show();
}).show();
}
//判断网络是否可用
if(networkInfo!=null){
flag=true;
}
return flag;
}
}

然后就是要在AndroidManifest.xml中添加 可以访问网络的权限


代码如下:

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