Android 常見工具類封裝

加密解密 Bitmap 安卓開發 · 發表 2019-01-25 00:20:47

摘要： 1，MD5工具類： public class MD5Util { public final static String MD5(String s) { char hexDigits[] = { '0', '1', '2...

1，MD5工具類：

public class MD5Util {
public final static String MD5(String s) {
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f' };
try {
byte[] btInput = s.getBytes();
// 獲得MD5摘要演算法的 MessageDigest 物件
MessageDigest mdInst = MessageDigest.getInstance("MD5");
// 使用指定的位元組更新摘要
mdInst.update(btInput);
// 獲得密文
byte[] md = mdInst.digest();
// 把密文轉換成十六進位制的字串形式
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
} catch (Exception e) {
return null;
}
}

public static void main(String[] args) {
System.out.print(MD5Util.MD5("password"));
}
}

2，執行緒睡眠

public class CSleep {
public static final long DEFAULT_SLEEP_TIME = 500;

private booleanisRuning= false;

public boolean isRuning() {
return isRuning;
}

public void runWithTime(final long defaultSleepTime) {
isRuning = true;
new Thread() {

@Override
public void run() {
try {
sleep(defaultSleepTime, 0);
} catch (InterruptedException e) {
e.printStackTrace();
}
isRuning = false;
super.run();
}
}.start();
}
}

3，檢查網路是否連通

/**
* 檢查網路是否連通
* 
* @return boolean
* @since V1.0
*/
public boolean isNetworkAvailable(Context context) {
// 建立並初始化連線物件
ConnectivityManager connMan = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
// 判斷初始化是否成功並作出相應處理
if (connMan != null) {
// 呼叫getActiveNetworkInfo方法建立物件,如果不為空則表明網路連通，否則沒連通
NetworkInfo info = connMan.getActiveNetworkInfo();
if (info != null) {
return info.isAvailable();
}
}
return false;
}

4，異常類捕捉

/**
 * UncaughtException處理類,當程式發生Uncaught異常的時候,由該類來接管程式,並記錄傳送錯誤報告. 需要在Application中註冊，為了要在程式啟動器就監控整個程式。
 */
public class CrashHandler implements UncaughtExceptionHandler {
/** TAG */
public static final StringTAG= "CrashHandler";
/** 系統預設的UncaughtException處理類 */
private Thread.UncaughtExceptionHandler mDefaultHandler;
/** CrashHandler例項 */
private static CrashHandlermCrashHandler;
/** 程式的Context物件 */
private ContextmContext;
/** 用來儲存裝置資訊和異常資訊 */
private Map<String, String>infos= new HashMap<String, String>();
/** 用於格式化日期,作為日誌檔名的一部分 */
private DateFormatformatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

/**
* 私有建構函式
*/
private CrashHandler() {

}

/**
* 獲取CrashHandler例項 ,單例模式
* 
* @return
* @since V1.0
*/
public static CrashHandler getInstance() {
if (mCrashHandler == null)
mCrashHandler = new CrashHandler();
return mCrashHandler;
}

/**
* 初始化
* 
* @param context
* @since V1.0
*/
public void init(Context context) {
mContext = context;
// 獲取系統預設的UncaughtException處理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
// 設定該CrashHandler為程式的預設處理器
Thread.setDefaultUncaughtExceptionHandler(this);
}

/**
* 當UncaughtException發生時會轉入該函式來處理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
if (!handleException(ex) && mDefaultHandler != null) {
// 如果使用者沒有處理則讓系統預設的異常處理器來處理
mDefaultHandler.uncaughtException(thread, ex);
} else {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
CLog.e(TAG, "uncaughtException() InterruptedException:" + e);
}
// 退出程式
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
}

/**
* 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成.
* 
* @param ex
* @return true:如果處理了該異常資訊;否則返回false.
* @since V1.0
*/
private boolean handleException(Throwable ex) {
if (ex == null) {
return false;
}

// 收集裝置引數資訊
collectDeviceInfo(mContext);

// 使用Toast來顯示異常資訊
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(mContext, "很抱歉,程式出現異常,即將退出.", Toast.LENGTH_SHORT).show();
Looper.loop();
}
}.start();

// 儲存日誌檔案
saveCatchInfo2File(ex);
return true;
}

/**
* 收集裝置引數資訊
* 
* @param ctx
* @since V1.0
*/
public void collectDeviceInfo(Context ctx) {
try {
PackageManager pm = ctx.getPackageManager();
PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
if (pi != null) {
String versionName = pi.versionName == null ? "null" : pi.versionName;
String versionCode = pi.versionCode + "";
infos.put("versionName", versionName);
infos.put("versionCode", versionCode);
}
} catch (NameNotFoundException e) {
CLog.e(TAG, "collectDeviceInfo() an error occured when collect package info NameNotFoundException:", e);
}
Field[] fields = Build.class.getDeclaredFields();
for (Field field : fields) {
try {
field.setAccessible(true);
infos.put(field.getName(), field.get(null).toString());
CLog.d(TAG, field.getName() + " : " + field.get(null));
} catch (Exception e) {
CLog.e(TAG, "collectDeviceInfo() an error occured when collect crash info Exception:", e);
}
}
}

/**
* 儲存錯誤資訊到檔案中
* 
* @param ex
* @return 返回檔名稱,便於將檔案傳送到伺服器
*/
private String saveCatchInfo2File(Throwable ex) {
StringBuffer sb = new StringBuffer();
for (Map.Entry<String, String> entry : infos.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key + "=" + value + "\n");
}

Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
sb.append(result);
try {
long timestamp = System.currentTimeMillis();
String time = formatter.format(new Date());
String fileName = "crash-" + time + "-" + timestamp + ".log";
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String path = FilePathUtil.getiVMSDirPath() + "/crash/";
File dir = new File(path);
if (!dir.exists()) {
dir.mkdirs();
}
FileOutputStream fos = new FileOutputStream(path + fileName);
fos.write(sb.toString().getBytes());
// 傳送給開發人員
sendCrashLog2PM(path + fileName);
fos.close();
}
return fileName;
} catch (Exception e) {
CLog.e(TAG, "saveCatchInfo2File() an error occured while writing file... Exception:", e);
}
return null;
}

/**
* 將捕獲的導致崩潰的錯誤資訊傳送給開發人員 目前只將log日誌儲存在sdcard 和輸出到LogCat中，並未傳送給後臺。
* 
* @param fileName
* @since V1.0
*/
private void sendCrashLog2PM(String fileName) {
if (!new File(fileName).exists()) {
CLog.e(TAG, "sendCrashLog2PM() 日誌檔案不存在");
return;
}
FileInputStream fis = null;
BufferedReader reader = null;
String s = null;
try {
fis = new FileInputStream(fileName);
reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
while (true) {
s = reader.readLine();
if (s == null)
break;
// 由於目前尚未確定以何種方式傳送，所以先打出log日誌。
CLog.e(TAG, s);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally { // 關閉流
try {
reader.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

5，圖片API類

public class ImageAPI {

public static Bitmap getImageByFilePath(String filePath, int scale) {
Bitmap res = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
options.inJustDecodeBounds = false;
options.inSampleSize = scale;
options.inPreferredConfig = Bitmap.Config.ARGB_4444;
return res;
}

public static Bitmap getImageByFilePath(String filePath, int Towidth, int ToHeight) {
Bitmap res = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
if (!new File(filePath).exists())
return res;
BitmapFactory.decodeFile(filePath, options);

int origionalWidth = options.outHeight;
int origionalHeight = options.outWidth;
options.inJustDecodeBounds = false;
int scale = Math.max(origionalWidth / Towidth, origionalHeight / ToHeight);
options.inSampleSize = scale;
options.inPreferredConfig = Bitmap.Config.ARGB_4444;
try {
res = BitmapFactory.decodeFile(filePath, options);
} catch (Exception e) {
e.printStackTrace();
return null;
} catch (OutOfMemoryError e) {
e.printStackTrace();
return null;
}
return res;
}

}

6，提醒封裝類

public static void showToast(Context ctx, int id, String str) {
if (str == null) {
return;
}

Toast toast = Toast.makeText(ctx, ctx.getString(id) + str, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}

public static void showToast(Context ctx, String errInfo) {
if (errInfo == null) {
return;
}

Toast toast = Toast.makeText(ctx, errInfo, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}

Android 常見工具類封裝

1，MD5工具類：

2，執行緒睡眠

3，檢查網路是否連通

4，異常類捕捉

5，圖片API類

6，提醒封裝類

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