Android 开发常用接口
android常用接口
常见的一些调用接口 更多阅读全文后star，实时更、更新收集到的接口
dip转px
public int convertDipOrPx(int dip) {
float scale = MarketApplication.getMarketApplicationContext().getResources().getDisplayMetrics().density;
return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
}获取当前窗体,并添加自定义view:
getWindowManager().addView(overlay, new WindowManager.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,PixelFormat.TRANSLUCENT));自定义fastScrollBar图片样式：
try { Field f = AbsListView.class.getDeclaredField("mFastScroller");
f.setAccessible(true); Object o = f.get(listView);
f = f.getType().getDeclaredField("mThumbDrawable");
f.setAccessible(true); Drawable drawable = (Drawable) f.get(o);
drawable = getResources().getDrawable(R.drawable.ic_launcher);
f.set(o, drawable); Toast.makeText(this, f.getType().getName(), 1000).show();
} catch (Exception e) { throw new RuntimeException(e);
}=网络=
判断网络是否可用：
/** * 网络是否可用 * * @param context * @return */
public static boolean isNetworkAvailable(Context context) { ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo[] info = mgr.getAllNetworkInfo(); if (info != null) { for (int i = 0; i < info.length; i++) { if (info[i].getState() == NetworkInfo.State.CONNECTED) { return true;
}
}
} return false;
}方法二：
/* * 判断网络连接是否已开 2012-08-20true 已打开 false 未打开 */
public static boolean isConn(Context context) { boolean bisConnFlag = false; ConnectivityManager conManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo network = conManager.getActiveNetworkInfo(); if (network != null) {
bisConnFlag = conManager.getActiveNetworkInfo().isAvailable();
} return bisConnFlag;
}判断是不是Wifi连接
public static boolean isWifiActive(Context icontext) { Context context = icontext.getApplicationContext(); ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo[] info; if (connectivity != null) {
info = connectivity.getAllNetworkInfo(); if (info != null) { for (int i = 0; i < info.length; i++) { if (info[i].getTypeName().equals("WIFI") && info[i].isConnected()) { return true;
}
}
}
} return false;
}判断当前网络类型
/** * 网络方式检查 */
private static int netCheck(Context context) { ConnectivityManager conMan = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE); State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
.getState(); State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.getState(); if (wifi.equals(State.CONNECTED)) { return DO_WIFI;
} else if (mobile.equals(State.CONNECTED)) { return DO_3G;
} else { return NO_CONNECTION;
}
}获取下载文件的真实名字
public String getReallyFileName(String url) { StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads().detectDiskWrites().detectNetwork() // 这里可以替换为detectAll()
// 就包括了磁盘读写和网络I/O
.penaltyLog() // 打印logcat，当然也可以定位到dropbox，通过文件保存相应的log
.build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects() // 探测SQLite数据库操作
.penaltyLog() // 打印logcat
.penaltyDeath().build()); String filename = ""; URL myURL; HttpURLConnection conn = null; if (url == null || url.length() < 1) { return null;
} try {
myURL = new URL(url);
conn = (HttpURLConnection) myURL.openConnection();
conn.connect();
conn.getResponseCode(); URL absUrl = conn.getURL();// 获得真实Url
// 打印输出服务器Header信息
// Map<String, List<String>> map = conn.getHeaderFields();
// for (String str : map.keySet()) {
// if (str != null) {
// Log.e("H3c", str + map.get(str));
// }
// }
filename = conn.getHeaderField("Content-Disposition");// 通过Content-Disposition获取文件名，这点跟服务器有关，需要灵活变通
if (filename == null || filename.length() < 1) {
filename = URLDecoder.decode(absUrl.getFile(), "UTF-8");
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally { if (conn != null) {
conn.disconnect();
conn = null;
}
} return filename;
}=图片==========================
bitmap转Byte数组(微信分享就需要用到)
public byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) { ByteArrayOutputStream output = new ByteArrayOutputStream();
bmp.compress(CompressFormat.PNG, 100, output); if (needRecycle) {
bmp.recycle();
} byte[] result = output.toByteArray(); try {
output.close();
} catch (Exception e) {
e.printStackTrace();
} return result;
}Resources转Bitmap
public Bitmap loadBitmap(Resources res, int id) { BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inPreferredConfig = Bitmap.Config.RGB_565;
opt.inPurgeable = true;
opt.inInputShareable = true; InputStream is = res.openRawResource(id);// 获取资源图片
return BitmapFactory.decodeStream(is, null, opt);
}保存图片到SD卡
public void saveBitmapToFile(String url, String filePath) { File iconFile = new File(filePath); if (!iconFile.getParentFile().exists()) {
iconFile.getParentFile().mkdirs();
} if (iconFile.exists() && iconFile.length() > 0) { return;
} FileOutputStream fos = null; InputStream is = null; try {
fos = new FileOutputStream(filePath);
is = new URL(url).openStream(); int data = is.read(); while (data != -1) {
fos.write(data);
data = is.read();
}
} catch (IOException e) {
e.printStackTrace();
} finally { try { if (is != null) {
is.close();
} if (fos != null) {
fos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}=系统==============================
#根据包名打开一个应用程序 public boolean openApp(String packageName) { PackageInfo pi = null; try {
pi = mPM.getPackageInfo(packageName, 0);
} catch (NameNotFoundException e) {
e.printStackTrace(); return false;
} if (pi == null) { return false;
} Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resolveIntent.setPackage(pi.packageName); List<ResolveInfo> apps = mPM.queryIntentActivities(resolveIntent, 0); ResolveInfo ri = null; try {
ri = apps.iterator().next();
} catch (Exception e) { return true;
} if (ri != null) { String tmpPackageName = ri.activityInfo.packageName; String className = ri.activityInfo.name; Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER); ComponentName cn = new ComponentName(tmpPackageName, className);
intent.setComponent(cn);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); MarketApplication.getMarketApplicationContext().startActivity(
intent);
} else { return false;
} return true;
}判断是否APK是否安装过
public boolean checkApkExist(Context context, String packageName) { if (packageName == null || "".equals(packageName)) return false; try { ApplicationInfo info = context.getPackageManager()
.getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES); return true;
} catch (NameNotFoundException e) { return false;
} catch (NullPointerException e) { return false;
}
}
```
#安装APK```java public void installApk(Context context, String strFileAllName) { File file = new File(strFileAllName); Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_VIEW); String type = "application/vnd.android.package-archive";
intent.setDataAndType(Uri.fromFile(file), type);
context.startActivity(intent);
}卸载APK
public void UninstallApk(Context context, String strPackageName) { Uri packageURI = Uri.parse("package:" + strPackageName); Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
context.startActivity(uninstallIntent);
}判断SD卡是否可用
public boolean CheckSD() { if (android.os.Environment.getExternalStorageState().equals( android.os.Environment.MEDIA_MOUNTED)) { return true;
} else { return false;
}
}创建快捷方式：
public void createShortCut(Context contxt) { // if (isInstallShortcut()) {// 如果已经创建了一次就不会再创建了
// return;
// }
Intent sIntent = new Intent(Intent.ACTION_MAIN);
sIntent.addCategory(Intent.CATEGORY_LAUNCHER);// 加入action,和category之后，程序卸载的时候才会主动将该快捷方式也卸载
sIntent.setClass(contxt, Login.class); Intent installer = new Intent();
installer.putExtra("duplicate", false);
installer.putExtra("android.intent.extra.shortcut.INTENT", sIntent);
installer.putExtra("android.intent.extra.shortcut.NAME", "名字");
installer.putExtra("android.intent.extra.shortcut.ICON_RESOURCE", Intent.ShortcutIconResource
.fromContext(contxt, R.drawable.icon));
installer.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
contxt.sendBroadcast(installer);
}判断快捷方式是否创建：
private boolean isInstallShortcut() { boolean isInstallShortcut = false; final ContentResolver cr = MarketApplication
.getMarketApplicationContext().getContentResolver(); String AUTHORITY = "com.android.launcher.settings"; Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY
+ "/favorites?notify=true"); Cursor c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" }, "title=?", new String[] { "名字" }, null); if (c != null && c.getCount() > 0) {
isInstallShortcut = true;
} if (c != null) {
c.close();
} if (isInstallShortcut) { return isInstallShortcut;
} AUTHORITY = "com.android.launcher2.settings"; CONTENT_URI = Uri.parse("content://" + AUTHORITY
+ "/favorites?notify=true");
c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" }, "title=?", new String[] { "名字" }, null); if (c != null && c.getCount() > 0) {
isInstallShortcut = true;
} if (c != null) {
c.close();
} AUTHORITY = "com.baidu.launcher"; CONTENT_URI = Uri.parse("content://" + AUTHORITY
+ "/favorites?notify=true");
c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" }, "title=?", new String[] { "名字" }, null); if (c != null && c.getCount() > 0) {
isInstallShortcut = true;
} if (c != null) {
c.close();
} return isInstallShortcut;
}过滤特殊字符：
private String StringFilter(String str) throws PatternSyntaxException { // 只允许字母和数字
// String regEx = "[^a-zA-Z0-9]";
// 清除掉所有特殊字符
String regEx = "[`~!@#$%^&*()+=|{}':;',//[//].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]"; Pattern p = Pattern.compile(regEx); Matcher m = p.matcher(str); return m.replaceAll("").trim();
}执行shell语句：
public int execRootCmdSilent(String cmd) { int result = -1; DataOutputStream dos = null; try { Process p = Runtime.getRuntime().exec("su");
dos = new DataOutputStream(p.getOutputStream());
dos.writeBytes(cmd + "\n");
dos.flush();
dos.writeBytes("exit\n");
dos.flush();
p.waitFor();
result = p.exitValue();
} catch (Exception e) {
e.printStackTrace();
} finally { if (dos != null) { try {
dos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} return result;
}获得文件MD5值：
public String getFileMD5(File file) { if (!file.isFile()) { return null;
} MessageDigest digest = null; FileInputStream in = null; byte buffer[] = new byte[1024]; int len; try {
digest = MessageDigest.getInstance("MD5");
in = new FileInputStream(file); while ((len = in.read(buffer, 0, 1024)) != -1) {
digest.update(buffer, 0, len);
}
} catch (Exception e) {
e.printStackTrace(); return null;
} finally { if (in != null) { try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} BigInteger bigInt = new BigInteger(1, digest.digest()); return bigInt.toString(16);
} 本文参与 腾讯云自媒体分享计划，分享自微信公众号。
原始发表：2016-07-01，如有侵权请联系 cloudcommunity@tencent.com 删除
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