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36个Android开发常用代码片段

作者:网络 发表于: 2016-07-10 点击: 399 次

36个Android开发常用代码片段

拨打电话

public static void call(Context context, String phoneNumber) {

context.startActivity( new Intent(Intent.ACTION_CALL, Uri.parse( “tel:” + phoneNumber)));

}

跳转至拨号界面

public static void callDial(Context context, String phoneNumber) {

context.startActivity( new Intent(Intent.ACTION_DIAL, Uri.parse( “tel:” + phoneNumber)));

}

发送短信

public static void sendSms(Context context, String phoneNumber,

String content) {

Uri uri = Uri.parse( “smsto:”

+ (TextUtils.isEmpty(phoneNumber) ? “” : phoneNumber));

Intent intent = new Intent(Intent.ACTION_SENDTO, uri);

intent.putExtra( “sms_body” , TextUtils.isEmpty(content) ? “” : content);

context.startActivity(intent);

}

唤醒屏幕并解锁

public static void wakeUpAndUnlock(Context context){

KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);

KeyguardManager.KeyguardLock kl = km.newKeyguardLock( “unLock” );

//解锁

kl.disableKeyguard();

//获取电源管理器对象

PowerManager pm=(PowerManager) context.getSystemService(Context.POWER_SERVICE);

//获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag

PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, “bright” );

//点亮屏幕

wl.acquire();

//释放

wl.release();

}

需要添加权限

<uses-permission android:name= “android.permission.WAKE_LOCK” />

<uses-permission android:name= “android.permission.DISABLE_KEYGUARD” />

判断当前App处于前台还是后台状态

public static boolean isApplicationBackground( final Context context) {

ActivityManager am = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

@SuppressWarnings ( “deprecation” )

List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks( 1 );

if (!tasks.isEmpty()) {

ComponentName topActivity = tasks.get( 0 ).topActivity;

if (!topActivity.getPackageName().equals(context.getPackageName())) {

return true ;

}

}

return false ;

}

需要添加权限

&lt;uses-permission

android:name= “android.permission.GET_TASKS” />

判断当前手机是否处于锁屏(睡眠)状态

public static boolean isSleeping(Context context) {

KeyguardManager kgMgr = (KeyguardManager) context

.getSystemService(Context.KEYGUARD_SERVICE);

boolean isSleeping = kgMgr.inKeyguardRestrictedInputMode();

return isSleeping;

}

判断当前是否有网络连接

public static boolean isOnline(Context context) {

ConnectivityManager manager = (ConnectivityManager) context

.getSystemService(Activity.CONNECTIVITY_SERVICE);

NetworkInfo info = manager.getActiveNetworkInfo();

if (info != null && info.isConnected()) {

return true ;

}

return false ;

}

判断当前是否是WIFI连接状态

public static boolean isWifiConnected(Context context) {

ConnectivityManager connectivityManager = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo wifiNetworkInfo = connectivityManager

.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

if (wifiNetworkInfo.isConnected()) {

return true ;

}

return false ;

}

安装APK

public static void installApk(Context context, File file) {

Intent intent = new Intent();

intent.setAction( “android.intent.action.VIEW” );

intent.addCategory( “android.intent.category.DEFAULT” );

intent.setType( “application/vnd.android.package-archive” );

intent.setDataAndType(Uri.fromFile(file),

“application/vnd.android.package-archive” );

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(intent);

}

判断当前设备是否为手机

public static boolean isPhone(Context context) {

TelephonyManager telephony = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_NONE) {

return false ;

} else {

return true ;

}

}

获取当前设备宽高,单位px

@SuppressWarnings ( “deprecation” )

public static int getDeviceWidth(Context context) {

WindowManager manager = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

return manager.getDefaultDisplay().getWidth();

}

@SuppressWarnings ( “deprecation” )

public static int getDeviceHeight(Context context) {

WindowManager manager = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

return manager.getDefaultDisplay().getHeight();

}

获取当前设备的IMEI,需要与上面的isPhone()一起使用

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static String getDeviceIMEI(Context context) {

String deviceId;

if (isPhone(context)) {

TelephonyManager telephony = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

deviceId = telephony.getDeviceId();

} else {

deviceId = Settings.Secure.getString(context.getContentResolver(),

Settings.Secure.ANDROID_ID);

}

return deviceId;

}

获取当前设备的MAC地址

public static String getMacAddress(Context context) {

String macAddress;

WifiManager wifi = (WifiManager) context

.getSystemService(Context.WIFI_SERVICE);

WifiInfo info = wifi.getConnectionInfo();

macAddress = info.getMacAddress();

if ( null == macAddress) {

return “” ;

}

macAddress = macAddress.replace( “:” , “” );

return macAddress;

}

获取当前程序的版本号

public static String getAppVersion(Context context) {

String version = “0” ;

try {

version = context.getPackageManager().getPackageInfo(

context.getPackageName(), 0 ).versionName;

} catch (PackageManager.NameNotFoundException e) {

e.printStackTrace();

}

return version;

}

收集设备信息,用于信息统计分析

public static Properties collectDeviceInfo(Context context) {

Properties mDeviceCrashInfo = new Properties();

try {

PackageManager pm = context.getPackageManager();

PackageInfo pi = pm.getPackageInfo(context.getPackageName(),

PackageManager.GET_ACTIVITIES);

if (pi != null ) {

mDeviceCrashInfo.put(VERSION_NAME,

pi.versionName == null ? “not set” : pi.versionName);

mDeviceCrashInfo.put(VERSION_CODE, pi.versionCode);

}

} catch (PackageManager.NameNotFoundException e) {

Log.e(TAG, “Error while collect package info” , e);

}

Field[] fields = Build. class .getDeclaredFields();

for (Field field : fields) {

try {

field.setAccessible( true );

mDeviceCrashInfo.put(field.getName(), field.get( null ));

} catch (Exception e) {

Log.e(TAG, “Error while collect crash info” , e);

}

}

return mDeviceCrashInfo;

}

public static String collectDeviceInfoStr(Context context) {

Properties prop = collectDeviceInfo(context);

Set deviceInfos = prop.keySet();

StringBuilder deviceInfoStr = new StringBuilder( “{\n” );

for (Iterator iter = deviceInfos.iterator(); iter.hasNext();) {

Object item = iter.next();

deviceInfoStr.append( “\t\t\t” + item + “:” + prop.get(item)

+ “, \n” );

}

deviceInfoStr.append( “}” );

return deviceInfoStr.toString();

}

是否有SD卡

public static boolean haveSDCard() {

return android.os.Environment.getExternalStorageState().equals(

android.os.Environment.MEDIA_MOUNTED);

}

动态隐藏软键盘

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static void hideSoftInput(Activity activity) {

View view = activity.getWindow().peekDecorView();

if (view != null ) {

InputMethodManager inputmanger = (InputMethodManager) activity

.getSystemService(Context.INPUT_METHOD_SERVICE);

inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0 );

}

}

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static void hideSoftInput(Context context, EditText edit) {

edit.clearFocus();

InputMethodManager inputmanger = (InputMethodManager) context

.getSystemService(Context.INPUT_METHOD_SERVICE);

inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0 );

}

动态显示软键盘

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static void showSoftInput(Context context, EditText edit) {

edit.setFocusable( true );

edit.setFocusableInTouchMode( true );

edit.requestFocus();

InputMethodManager inputManager = (InputMethodManager) context

.getSystemService(Context.INPUT_METHOD_SERVICE);

inputManager.showSoftInput(edit, 0 );

}

动态显示或者是隐藏软键盘

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static void toggleSoftInput(Context context, EditText edit) {

edit.setFocusable( true );

edit.setFocusableInTouchMode( true );

edit.requestFocus();

InputMethodManager inputManager = (InputMethodManager) context

.getSystemService(Context.INPUT_METHOD_SERVICE);

inputManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0 );

}

主动回到Home,后台运行

public static void goHome(Context context) {

Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);

mHomeIntent.addCategory(Intent.CATEGORY_HOME);

mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK

| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

context.startActivity(mHomeIntent);

}

获取状态栏高度

注意,要在onWindowFocusChanged中调用,在onCreate中获取高度为0

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static int getStatusBarHeight(Activity activity) {

Rect frame = new Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

return frame.top;

}

获取状态栏高度+标题栏(ActionBar)高度

(注意,如果没有ActionBar,那么获取的高度将和上面的是一样的,只有状态栏的高度)

public static int getTopBarHeight(Activity activity) {

return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)

.getTop();

}

获取MCC+MNC代码 (SIM卡运营商国家代码和运营商网络代码)

仅当用户已在网络注册时有效, CDMA 可能会无效(中国移动:46000 46002, 中国联通:46001,中国电信:46003)

public static String getNetworkOperator(Context context) {

TelephonyManager telephonyManager = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

return telephonyManager.getNetworkOperator();

}

返回移动网络运营商的名字

(例:中国联通、中国移动、中国电信) 仅当用户已在网络注册时有效, CDMA 可能会无效)

public static String getNetworkOperatorName(Context context) {

TelephonyManager telephonyManager = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

return telephonyManager.getNetworkOperatorName();

}

返回移动终端类型

  1. PHONE_TYPE_NONE :0 手机制式未知
  2. PHONE_TYPE_GSM :1 手机制式为GSM,移动和联通
  3. PHONE_TYPE_CDMA :2 手机制式为CDMA,电信
  4. PHONE_TYPE_SIP:3
public static int getPhoneType(Context context) {

TelephonyManager telephonyManager = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

return telephonyManager.getPhoneType();

}

判断手机连接的网络类型(2G,3G,4G)

联通的3G为UMTS或HSDPA,移动和联通的2G为GPRS或EGDE,电信的2G为CDMA,电信的3G为EVDO

public class Constants {

/**

* Unknown network class

*/

public static final int NETWORK_CLASS_UNKNOWN = 0 ;

/**

* wifi net work

*/

public static final int NETWORK_WIFI = 1 ;

/**

* “2G” networks

*/

public static final int NETWORK_CLASS_2_G = 2 ;

/**

* “3G” networks

*/

public static final int NETWORK_CLASS_3_G = 3 ;

/**

* “4G” networks

*/

public static final int NETWORK_CLASS_4_G = 4 ;

}

public static int getNetWorkClass(Context context) {

TelephonyManager telephonyManager = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

switch (telephonyManager.getNetworkType()) {

case TelephonyManager.NETWORK_TYPE_GPRS:

case TelephonyManager.NETWORK_TYPE_EDGE:

case TelephonyManager.NETWORK_TYPE_CDMA:

case TelephonyManager.NETWORK_TYPE_1xRTT:

case TelephonyManager.NETWORK_TYPE_IDEN:

return Constants.NETWORK_CLASS_2_G;

case TelephonyManager.NETWORK_TYPE_UMTS:

case TelephonyManager.NETWORK_TYPE_EVDO_0:

case TelephonyManager.NETWORK_TYPE_EVDO_A:

case TelephonyManager.NETWORK_TYPE_HSDPA:

case TelephonyManager.NETWORK_TYPE_HSUPA:

case TelephonyManager.NETWORK_TYPE_HSPA:

case TelephonyManager.NETWORK_TYPE_EVDO_B:

case TelephonyManager.NETWORK_TYPE_EHRPD:

case TelephonyManager.NETWORK_TYPE_HSPAP:

return Constants.NETWORK_CLASS_3_G;

case TelephonyManager.NETWORK_TYPE_LTE:

return Constants.NETWORK_CLASS_4_G;

default :

return Constants.NETWORK_CLASS_UNKNOWN;

}

}

判断当前手机的网络类型(WIFI还是2,3,4G)

需要用到上面的方法

public static int getNetWorkStatus(Context context) {

int netWorkType = Constants.NETWORK_CLASS_UNKNOWN;

ConnectivityManager connectivityManager = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected()) {

int type = networkInfo.getType();

if (type == ConnectivityManager.TYPE_WIFI) {

netWorkType = Constants.NETWORK_WIFI;

} else if (type == ConnectivityManager.TYPE_MOBILE) {

netWorkType = getNetWorkClass(context);

}

}

return netWorkType;

}

px-dp转换

public static int dip2px(Context context, float dpValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return ( int ) (dpValue * scale + 0 .5f);

}

public static int px2dip(Context context, float pxValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return ( int ) (pxValue / scale + 0 .5f);

}

px-sp转换

public static int px2sp(Context context, float pxValue) {

final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;

return ( int ) (pxValue / fontScale + 0 .5f);

}

public static int sp2px(Context context, float spValue) {

final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;

return ( int ) (spValue * fontScale + 0 .5f);

}

把一个毫秒数转化成时间字符串

格式为小时/分/秒/毫秒(如:24903600 –> 06小时55分03秒600毫秒)

/**

* @param millis

*            要转化的毫秒数。

* @param isWhole

*            是否强制全部显示小时/分/秒/毫秒。

* @param isFormat

*            时间数字是否要格式化,如果true:少位数前面补全;如果false:少位数前面不补全。

* @return 返回时间字符串:小时/分/秒/毫秒的格式(如:24903600 –> 06小时55分03秒600毫秒)。

*/

public static String millisToString( long millis, boolean isWhole,

boolean isFormat) {

String h = “” ;

String m = “” ;

String s = “” ;

String mi = “” ;

if (isWhole) {

h = isFormat ? “00小时” : “0小时” ;

m = isFormat ? “00分” : “0分” ;

s = isFormat ? “00秒” : “0秒” ;

mi = isFormat ? “00毫秒” : “0毫秒” ;

}

long temp = millis;

long hper = 60 * 60 * 1000 ;

long mper = 60 * 1000 ;

long sper = 1000 ;

if (temp / hper > 0 ) {

if (isFormat) {

h = temp / hper < 10 ? “0” + temp / hper : temp / hper + “” ;

} else {

h = temp / hper + “” ;

}

h += “小时” ;

}

temp = temp % hper;

if (temp / mper > 0 ) {

if (isFormat) {

m = temp / mper < 10 ? “0” + temp / mper : temp / mper + “” ;

} else {

m = temp / mper + “” ;

}

m += “分” ;

}

temp = temp % mper;

if (temp / sper > 0 ) {

if (isFormat) {

s = temp / sper < 10 ? “0” + temp / sper : temp / sper + “” ;

} else {

s = temp / sper + “” ;

}

s += “秒” ;

}

temp = temp % sper;

mi = temp + “” ;

if (isFormat) {

if (temp < 100 && temp >= 10 ) {

mi = “0” + temp;

}

if (temp < 10 ) {

mi = “00” + temp;

}

}

mi += “毫秒” ;

return h + m + s + mi;

}

格式为小时/分/秒/毫秒(如:24903600 –> 06小时55分03秒)。

/**

*

* @param millis

*            要转化的毫秒数。

* @param isWhole

*            是否强制全部显示小时/分/秒/毫秒。

* @param isFormat

*            时间数字是否要格式化,如果true:少位数前面补全;如果false:少位数前面不补全。

* @return 返回时间字符串:小时/分/秒/毫秒的格式(如:24903600 –> 06小时55分03秒)。

*/

public static String millisToStringMiddle( long millis, boolean isWhole,

boolean isFormat) {

return millisToStringMiddle(millis, isWhole, isFormat, “小时” , “分钟” , “秒” );

}

public static String millisToStringMiddle( long millis, boolean isWhole,

boolean isFormat, String hUnit, String mUnit, String sUnit) {

String h = “” ;

String m = “” ;

String s = “” ;

if (isWhole) {

h = isFormat ? “00” + hUnit : “0” + hUnit;

m = isFormat ? “00” + mUnit : “0” + mUnit;

s = isFormat ? “00” + sUnit : “0” + sUnit;

}

long temp = millis;

long hper = 60 * 60 * 1000 ;

long mper = 60 * 1000 ;

long sper = 1000 ;

if (temp / hper > 0 ) {

if (isFormat) {

h = temp / hper < 10 ? “0” + temp / hper : temp / hper + “” ;

} else {

h = temp / hper + “” ;

}

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