android代码片段整理，持续更新中(二)。。。。。。

一.Volley请求post

RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
StringRequest stringRequest = new StringRequest(Method.POST, httpUrl, new Listener<String>() {

@Override
public void onResponse(String response) {
// TODO Auto-generated method stub
System.out.println(">>>>>>>>>>response" + response);
}
}, new Response.ErrorListener() {

@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
System.out.println(">>>>>>>>>>error" + error);
}
}) {
public Map<String, String> getParams() {
Map<String, String> map = new HashMap<String, String>();
map.put("name", "xiaoxiao");
map.put("id", "33");
return map;
}

public Map<String, String> getHeaders() {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Accept", "application/json");
headers.put("Content-Type", "application/json; charset=UTF-8");

return headers;
}
};
requestQueue.add(stringRequest);
}

二.httpclient请求传入json

public static void httpPostWithJSON(String url, String json) throws Exception {
// 将JSON进行UTF-8编码,以便传输中文
String encoderJson = URLEncoder.encode(json, HTTP.UTF_8);
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
StringEntity se = new StringEntity(encoderJson);
se.setContentType("text/json");
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,"application/json"));
httpPost.setEntity(se);
HttpResponse httpResponse =httpClient.execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的字符串
String strResult = EntityUtils.toString(httpResponse.getEntity());
System.out.println(">>>>>>>>>>" + strResult);

}
}

三.AsyncHttpClient工具类

public class HttpUtil {
private static AsyncHttpClient client = new AsyncHttpClient(); // 实例话对象
static {
client.setTimeout(10000); // 设置链接超时，如果不设置，默认为10s
}

// 用一个完整url获取一个string对象
public static void get(String urlString, AsyncHttpResponseHandler res) {
client.get(urlString, res);
}

// url里面带参数
public static void get(String urlString, RequestParams params, AsyncHttpResponseHandler res) {
client.get(urlString, params, res);
}

// 不带参数，获取json对象或者数组
public static void get(String urlString, JsonHttpResponseHandler res) {
client.get(urlString, res);
}

// 带参数，获取json对象或者数组
public static void get(String urlString, RequestParams params, JsonHttpResponseHandler res) {
client.get(urlString, params, res);
}

// 下载数据使用，会返回byte数据
public static void get(String uString, BinaryHttpResponseHandler bHandler) {
client.get(uString, bHandler);
}

public static AsyncHttpClient getClient() {
return client;
}

四.获得预览分辨率二

List<Size> preSize = parameters.getSupportedPreviewSizes();
previewWidth = preSize.get(0).width;
previewHeight = preSize.get(0).height;
for (int i = 1; i < preSize.size(); i++) {
//rotate 90
double diff2 = Math.abs((double) preSize.get(i).width
/ preSize.get(i).height - (double) screenHeight
/ screenWidth);
if(diff2<0.1)
{
int diff3 = Math.abs(previewHeight * previewWidth
- DEFAULT_RESOLUTION);
int diff4 = Math.abs(preSize.get(i).height
* preSize.get(i).width - DEFAULT_RESOLUTION);
if (diff3 > diff4)
{
previewWidth = preSize.get(i).width;
previewHeight = preSize.get(i).height;
}
}
}
//current only support landscape
parameters.setPreviewSize(previewWidth, previewHeight);

五.AudioRecord录音写入文件

while (isRecord == true) {
readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes);
if (AudioRecord.ERROR_INVALID_OPERATION != readsize && fos!=null) {
try {
fos.write(audiodata,0, readsize);  // 只从当前位置，写入到实际读到的字节数
} catch (IOException e) {
e.printStackTrace();
}
}
}

六.httpUrlconnection

Runnable runnable = new Runnable() {
@Override
public void run() {
try {
URL url = new URL(imgUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(10000);
if (conn.getResponseCode() == 200) {
InputStream in = conn.getInputStream();
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int length = -1;
while ((length = in.read(bytes)) != -1) {
out.write(bytes, 0, length);
}
picByte = out.toByteArray();
in.close();
out.close();
handler.sendEmptyMessage(0x123);
}

} catch (IOException e) {
e.printStackTrace();
}
}
};

七安全转换为int

public final static int convertToInt(Object value, int defaultValue) {
if (value == null || "".equals(value.toString().trim())) {
return defaultValue;
}
try {
return Integer.valueOf(value.toString());
} catch (Exception e) {
try {
return Double.valueOf(value.toString()).intValue();
} catch (Exception e1) {
return defaultValue;
}
}
}

八防止被重复点击

/*
* 防止按钮被重复点击
*/
private static long lastClickTime;

public synchronized static boolean isFastClick()
{
long time = System.currentTimeMillis();
if (time - lastClickTime < 1000)
{
//			LogUtils.i("kkkk", "time - lastClickTime：" + (time - lastClickTime));
return true;
}
lastClickTime = time;
return false;
}

九显示隐藏键盘

//弹出键盘
protected void showInputMethod(final EditText editText)
{
// 弹出键盘
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
editText.setFocusableInTouchMode(true);
editText.setFocusable(true);
editText.requestFocus();
editText.setSelection(editText.getText().length());
((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).showSoftInput(
editText, 0);
}
}, 300);
}

//关闭键盘
protected void closeInputMethod(EditText editText)
{
((InputMethodManager) getSystemService(
Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(editText.getWindowToken(),
0);
}<

十.gradle各个版本

点击打开链接