public?void?doClick(View?v)?{ switch?(v.getId())?{ case?R.id.network: if?(isNetWorkConnected(MainActivity.this)?==?true)?{ Toast.makeText(MainActivity.this,?"有網絡連接",?Toast.LENGTH_SHORT) .show(); }?else?{ Toast.makeText(MainActivity.this,?"網絡未連接",?Toast.LENGTH_SHORT) .show(); } break; case?R.id.enableOrDisable_WIFI: WifiManager?wifiManager?=?(WifiManager)?MainActivity.this .getSystemService(WIFI_SERVICE); if?(wifiManager.isWifiEnabled())?{ wifiManager.setWifiEnabled(false); Toast.makeText(MainActivity.this,?"Wifi已關閉",?Toast.LENGTH_SHORT) .show(); }?else?{ wifiManager.setWifiEnabled(true); Toast.makeText(MainActivity.this,?"Wifi已打開",?Toast.LENGTH_SHORT) .show(); } break; case?R.id.getvoice: AudioManager?mAudioManager?=?(AudioManager)?MainActivity.this .getSystemService(AUDIO_SERVICE); int?max?=?mAudioManager .getStreamMaxVolume(AudioManager.STREAM_SYSTEM); int?current?=?mAudioManager .getStreamVolume(AudioManager.STREAM_RING); Toast.makeText(MainActivity.this, "最大音量為："?+?max?+?",當前音量為："?+?current,?Toast.LENGTH_SHORT) .show(); break; case?R.id.getPackagename: ActivityManager?activityManager?=?(ActivityManager)?MainActivity.this .getSystemService(ACTIVITY_SERVICE); String?packageName?=?activityManager.getRunningTasks(1).get(0).topActivity .getPackageName(); Toast.makeText(MainActivity.this,?"當前的包名為：\n"?+?packageName, Toast.LENGTH_SHORT).show(); break; } }public?boolean?isNetWorkConnected(Context?context)?{ if?(context?!=?null)?{ ConnectivityManager?mConnectivityManager?=?(ConnectivityManager)?context .getSystemService(CONNECTIVITY_SERVICE); //?獲取當前網絡活動狀態 NetworkInfo?mNetworkInfo?=?mConnectivityManager .getActiveNetworkInfo(); if?(mNetworkInfo?!=?null)?{ return?mNetworkInfo.isAvailable();//?返回是否有網絡鏈接 } } return?false; }