android--(http协议、显示网络中的图片、https)

https:
android httpClient 支持HTTPS的访问方式 - http://mobile.51cto.com/aprogram-447714.htm

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void checkNet(View view) {        boolean newWork = isNetworkConnected(this);        boolean wifi = isWiffiConnected(this);        boolean mobile = isMobileConnected(this);       int t =  getConnectedType(this);        if (newWork) {            Toast.makeText(this, "网络可用", Toast.LENGTH_SHORT).show();        } else {            Toast.makeText(this, "网络不可用", Toast.LENGTH_SHORT).show();        }        if (wifi) {            Toast.makeText(this, "wifi可用", Toast.LENGTH_SHORT).show();        } else {            Toast.makeText(this, "wifi不可用", Toast.LENGTH_SHORT).show();        }        if (mobile) {            Toast.makeText(this, "mobile可用", Toast.LENGTH_SHORT).show();        } else {            Toast.makeText(this, "mobile不可用", Toast.LENGTH_SHORT).show();        }        Toast.makeText(this, "网络类型："+t, Toast.LENGTH_SHORT).show();    }    /**     * 判断网络是否可用     *     * @param context     * @return     */    public boolean isNetworkConnected(Context context) {        if (context != null) {            ConnectivityManager connectivityManager =                    (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();            if (networkInfo != null) {                return networkInfo.isAvailable();            }        }        return false;    }    /**     * 判断 wifi 是否可用     *     * @param context     * @return     */    public boolean isWiffiConnected(Context context) {        if (context != null) {            ConnectivityManager connectivityManager =                    (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);            //根据网络的类型，获取相就类型的网络信息            NetworkInfo wifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);            if (wifi != null) {                return wifi.isAvailable();            }        }        return false;    }    /**     * 判断 Mobile 网络是不可用     *     * @param context     * @return     */    public boolean isMobileConnected(Context context) {        if (context != null) {            ConnectivityManager connectivityManager =                    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo mobileNet = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);            if (mobileNet != null) {                return mobileNet.isAvailable();            }        }        return false;    }    /**     * 获取当前网络链接的类型信息     *     * @param context     * @return     */    public static int getConnectedType(Context context) {        if (context != null) {            ConnectivityManager connectivityManager =                    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();            if (networkInfo != null && networkInfo.isAvailable()) {                return networkInfo.getType();            }        }        return -1;    }}

/** * 访问的网络必须在 线程中完成，显示网络中的图片 */public class Img extends AppCompatActivity {    private static ImageView imageView;    private final MyHandler myHandler = new MyHandler(this);    private static final int LOAD_SUCESS = 0x1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_img);        imageView = (ImageView) findViewById(R.id.imageView);        showImg();    }    /**     * 线程之间进行通信处理     */    private static class MyHandler extends Handler {        //软引用对象        private final WeakReference<Img> weakReference;        public MyHandler(Img img) {            this.weakReference = new WeakReference<Img>(img);        }        @Override        public void handleMessage(Message msg) {            Img img = weakReference.get();            if (img != null) {                switch (msg.what) {                    case LOAD_SUCESS:                        // 在图片视图中显示 图片                        imageView.setImageBitmap((Bitmap) msg.obj);                        break;                }            }        }    }    /**     * 网络显示图片 需要在线程中进行，防止网络阻塞     */    public void showImg() {        new Thread(new Runnable() {            @Override            public void run() {                String path = "http://img2.imgtn.bdimg.com/it/u=2655910209,3235656411&fm=21&gp=0.jpg";                try {                    URL url = new URL(path);                    InputStream in = url.openStream();                    //以什么形式解码                    Bitmap bitmap = BitmapFactory.decodeStream(in);                    //数据存入 handler的message                    Message message = myHandler.obtainMessage(LOAD_SUCESS, bitmap);                    //发送                    myHandler.sendMessage(message);                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }}activity.xml <uses-permission android:name="android.permission.INTERNET"></uses-permission>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".Img"            android:label="@string/title_activity_img" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>

public class HttpUrl extends AppCompatActivity {    private TextView tv_info;    private EditText et_username, et_password;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_http_url);        tv_info = (TextView) findViewById(R.id.tv_info);        et_username = (EditText) findViewById(R.id.editText_username);        et_password = (EditText) findViewById(R.id.editText_password);    }    public void logIn(View view) {        String username = et_username.getText().toString();        String password = et_password.getText().toString();        if (TextUtils.isEmpty(username)) {            Toast.makeText(this, "用户名不能为空", Toast.LENGTH_SHORT).show();            return;        }        if (TextUtils.isEmpty(password)) {            Toast.makeText(this, "密码不能为空", Toast.LENGTH_SHORT).show();            return;        }        new Thread(new Runnable() {            @Override            public void run() {                //这个路径为本地的 web服务器应用路径                String path = "http://10.0.2.2:8080/";                try {                    URL url = new URL(path);                    //建立http链接                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    //请求方式                    conn.setRequestMethod("POST");                    //因为是post请求                    conn.setDoOutput(true);                    //因为是HttpURLConnection                    conn.setDoInput(true);                    //链接超时 时间毫秒                    conn.setConnectTimeout(1000 * 30);                    //数据超时                    conn.setReadTimeout(1000 * 30);                    //不缓存                    conn.setUseCaches(false);                    //请求的属性                    conn.setRequestProperty("Content-type", "application/x-www-form-urlencoded");                    //对服务器端读取或写入数据（使用输入输出流）                    //获取链接的输出流                    DataOutputStream out = new DataOutputStream(conn.getOutputStream());                    //往服务端写入参数数据                    out.writeBytes("username=" + URLEncoder.encode(et_username.getText().toString(), "gbk"));                    out.writeBytes("&password=" + URLEncoder.encode(et_password.getText().toString(), "gbk"));                    out.flush();                    out.close();                    /***********从服务端获取数据***********************/                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));//字节流转字符流                    String result = br.readLine();                    br.close();                    conn.disconnect();//关闭http链接                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }}

//先将参数放入List，再对参数进行URL编码  List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();  params.add(new BasicNameValuePair("param1", "中国"));  params.add(new BasicNameValuePair("param2", "value2"));  //对参数编码  String param = URLEncodedUtils.format(params, "UTF-8");  //baseUrl             String baseUrl = "http://ubs.free4lab.com/php/method.php";  //将URL与参数拼接  HttpGet getMethod = new HttpGet(baseUrl + "?" + param);  HttpClient httpClient = new DefaultHttpClient();  try {      HttpResponse response = httpClient.execute(getMethod); //发起GET请求      Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码      Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//获取服务器响应内容  } catch (ClientProtocolException e) {      // TODO Auto-generated catch block      e.printStackTrace();  } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();  }  

/和GET方式一样，先将参数放入List  params = new LinkedList<BasicNameValuePair>();  params.add(new BasicNameValuePair("param1", "Post方法"));  params.add(new BasicNameValuePair("param2", "第二个参数"));  try {      HttpPost postMethod = new HttpPost(baseUrl);      postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将参数填入POST Entity中      HttpResponse response = httpClient.execute(postMethod); //执行POST方法      Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码      Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //获取响应内容  } catch (UnsupportedEncodingException e) {      // TODO Auto-generated catch block      e.printStackTrace();  } catch (ClientProtocolException e) {      // TODO Auto-generated catch block      e.printStackTrace();  } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();  }