平時寫安卓代碼時，用到某個功能，其實也比較簡單，但經常疏忽忘記怎樣寫，所以將開發過程中經常用到的安卓示例代碼總結到下面，用的時候直接Copy過去就行。這樣開發時，做個優先的搬運工。

/*** 子線程更新UI示例*/ public void onClick(View v) {new Thread(new Runnable() {public void run() {// a potentially time consuming taskfinal Bitmap bitmap =processBitMap("image.png");imageView.post(new Runnable() {public void run() {imageView.setImageBitmap(bitmap);}});}}).start(); }

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/*** 弱引用使用*/ public void setData(String key, Object object) { WeakReference value =new WeakReference<>(object); dataList.put(key, value); }

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/*** 泛型示例*/ double a = FanTest1.MaxNum(2.3, 3.5, 5.4);public static <T extends Comparable<T>> T MaxNum(T x, T y, T z){T max = x;if(y.compareTo(max)>0){max = y;}return max;}

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/*** Thread帶Looper示例*/ class LooperThread extends Thread {public Handler mHandler; public void run() {Looper.prepare();mHandler = new Handler(Looper.myLooper()) {public void handleMessage(Message msg) {// process incoming messages here}}; Looper.loop();}}

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/*** 注解示例，編譯檢查用*/ public void setAlpha(@IntRange(from=0,to=255) int alpha) { ... } public void setAlpha(@FloatRange(from=0.0, to=1.0) float alpha) {...} @RequiresPermission(allOf = {Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.ACCESS_MEDIA_LOCATION}) public static final void copyImageFile(String dest, String source) {//... }

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/*** 升序 */ Collections.sort(list, new Comparator<CommoditysBean>() {@Overridepublic int compare(CommoditysBean o1, CommoditysBean o2) {return MyUtils.strToInt(o1.getDifferenceQty()) - MyUtils.strToInt(o2.getDifferenceQty());}});

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/*** 打開一個網頁*/ private void clickMall() { String requestURL = "http://applink.dossav.com/shop"; Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(requestURL)); startActivity(intent); }

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/*** 判斷時間差*/ public static Date g_LastDate = new Date(System.currentTimeMillis()); long diff = new Date(System.currentTimeMillis()).getTime()- g_LastDate.getTime(); if (diff < 5000) { //5秒return; }

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/*** Hadler發送消息示例*/ private static final int MSG_SHOW_NETWORKNOTACCESS = 200; private Handler mHandler = new Handler(Looper.getMainLooper()){@Overridepublic void handleMessage(Message msg){switch (msg.what){case MSG_SHOW_NETWORKACCESS://do somethingbreak; }}}; mHandler.sendEmptyMessage(MSG_SHOW_NETWORKACCESS);

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/*** UI線程執行*/ runOnUiThread(new Runnable() {@Overridepublic void run() { //刷新UI}});

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/*** 創建子線程*/ new Thread() {public void run() {System.out.println("Thread is running.");}}.start();

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/*** 判斷WIFI連接的是2.4G還是5G WIFI*/ WifiManager wifiManager = (WifiManager)getApplicationContext(). getSystemService(Context.WIFI_SERVICE);//注意用getApplicationContext可以避免android內存泄漏. WifiInfo wifiInfo= wifiManager.getConnectionInfo(); int frequency = wifiInfo.getFrequency();//以5開關是5G WIFI， 2開頭是2.4G Log.i(TAG, "frequency = " + frequency );//備注：AndroidManifest.xml權限要加 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

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/*** ExecutorService 示例* ExecutorService原代碼是個接口類*/ private ExecutorService mExecutor; mExecutor = Executors.newCachedThreadPool(); Runnable runnable = new Runnable() {@Overridepublic void run() {String threadName = Thread.currentThread().getName();Log.i("TAG", "runnable is running");Log.i("TAG", "threadName = " + threadName);}}; mExecutor.execute(runnable);//onDestroy里加下面代碼 if (null != mExecutor) {mExecutor.shutdown(); }

參考示例：
Android開發人員不得不收集的代碼(持續更新中)
https://blog.csdn.net/feelinghappy/article/details/105575062

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作者簡介：https://shimo.im/docs/rp3OVwxle2fJn7Am/
上海徐匯
2022年4月3日

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