Android常用代码
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需要添加权限
需要添加权限
36个Android开发常用代码片段
拨打电话
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public
static
void
call(Context context, String phoneNumber) {
context.startActivity(
new
Intent(Intent.ACTION_CALL, Uri.parse(
"tel:"
+ phoneNumber)));
}
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跳转至拨号界面
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public
static
void
callDial(Context context, String phoneNumber) {
context.startActivity(
new
Intent(Intent.ACTION_DIAL, Uri.parse(
"tel:"
+ phoneNumber)));
}
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发送短信
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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);
}
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唤醒屏幕并解锁
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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();
}
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需要添加权限
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<uses-permission android:name=
"android.permission.WAKE_LOCK"
/>
<uses-permission android:name=
"android.permission.DISABLE_KEYGUARD"
/>
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判断当前App处于前台还是后台状态
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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
;
}
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需要添加权限
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<uses-permission
android:name=
"android.permission.GET_TASKS"
/>
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判断当前手机是否处于锁屏(睡眠)状态
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public
static
boolean
isSleeping(Context context) {
KeyguardManager kgMgr = (KeyguardManager) context
.getSystemService(Context.KEYGUARD_SERVICE);
boolean
isSleeping = kgMgr.inKeyguardRestrictedInputMode();
return
isSleeping;
}
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判断当前是否有网络连接
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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
;
}
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判断当前是否是WIFI连接状态
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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
;
}
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安装APK
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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);
}
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判断当前设备是否为手机
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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
;
}
}
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获取当前设备宽高，单位px
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@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();
}
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获取当前设备的IMEI，需要与上面的isPhone()一起使用
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@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;
}
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获取当前设备的MAC地址
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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;
}
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获取当前程序的版本号
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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;
}
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收集设备信息，用于信息统计分析
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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();
}
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是否有SD卡
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public
static
boolean
haveSDCard() {
return
android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
}
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动态隐藏软键盘
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@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
);
}
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动态显示软键盘
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@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
);
}
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动态显示或者是隐藏软键盘
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@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
);
}
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主动回到Home，后台运行
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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);
}
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获取状态栏高度
注意，要在onWindowFocusChanged中调用，在onCreate中获取高度为0
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@TargetApi
(Build.VERSION_CODES.CUPCAKE)
public
static
int
getStatusBarHeight(Activity activity) {
Rect frame =
new
Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
return
frame.top;
}
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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)
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public
static
int
getTopBarHeight(Activity activity) {
return
activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)
.getTop();
}
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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）
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public
static
String getNetworkOperator(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return
telephonyManager.getNetworkOperator();
}
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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)
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public
static
String getNetworkOperatorName(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return
telephonyManager.getNetworkOperatorName();
}
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返回移动终端类型
- PHONE_TYPE_NONE :0 手机制式未知
- PHONE_TYPE_GSM :1 手机制式为GSM，移动和联通
- PHONE_TYPE_CDMA :2 手机制式为CDMA，电信
- PHONE_TYPE_SIP:3
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public
static
int
getPhoneType(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return
telephonyManager.getPhoneType();
}
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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
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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
:
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