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Added in API level 7

SignalStrength

public class SignalStrength
extends Object implements Parcelable

java.lang.Object
   ↳ android.telephony.SignalStrength


包含手机信号强度相关信息。

Summary

Inherited constants

From interface android.os.Parcelable

Public methods

int describeContents()

describeContents()

boolean equals(Object o)

指示其他某个对象是否“等于”这一个。

int getCdmaDbm()

以dBm为单位获取CDMA RSSI值

int getCdmaEcio()

获取以dB * 10为单位的CDMA Ec / Io值

int getEvdoDbm()

获取以dBm为单位的EVDO RSSI值

int getEvdoEcio()

获取以dB * 10为单位的EVDO Ec / Io值

int getEvdoSnr()

获得信噪比。

int getGsmBitErrorRate()

获取TS 27.007 8.5中定义的GSM误码率(0-7,99)

int getGsmSignalStrength()

获得GSM信号强度,有效值为(0-31,99),如TS 27.007 8.5中定义

int getLevel()

检索整体信号强度的抽象等级值。

int hashCode()

返回对象的哈希码值。

boolean isGsm()
String toString()

返回对象的字符串表示形式。

void writeToParcel(Parcel out, int flags)

writeToParcel(Parcel, int)

Inherited methods

From class java.lang.Object
From interface android.os.Parcelable

Public methods

describeContents

Added in API level 7
int describeContents ()

describeContents()

Returns
int a bitmask indicating the set of special object types marshaled by this Parcelable object instance.

equals

Added in API level 7
boolean equals (Object o)

指示其他某个对象是否“等于”这一个。

equals方法在非空对象引用上实现等价关系:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

Objectequals方法实现了对象上最可能的等价关系; 也就是说,对于任何非空参考值xy ,此方法返回true当且仅当xy引用同一对象( x == y具有值true )。

请注意,无论何时重写此方法,通常都必须重写 hashCode方法,以便维护 hashCode方法的常规协定,该方法声明等同对象必须具有相同的哈希码。

Parameters
o Object: the reference object with which to compare.
Returns
boolean true if the signal strengths are the same

getCdmaDbm

Added in API level 7
int getCdmaDbm ()

以dBm为单位获取CDMA RSSI值

Returns
int

getCdmaEcio

Added in API level 7
int getCdmaEcio ()

获取以dB * 10为单位的CDMA Ec / Io值

Returns
int

getEvdoDbm

Added in API level 7
int getEvdoDbm ()

获取以dBm为单位的EVDO RSSI值

Returns
int

getEvdoEcio

Added in API level 7
int getEvdoEcio ()

获取以dB * 10为单位的EVDO Ec / Io值

Returns
int

getEvdoSnr

Added in API level 7
int getEvdoSnr ()

获得信噪比。 有效值是0-8。 8是最高的。

Returns
int

getGsmBitErrorRate

Added in API level 7
int getGsmBitErrorRate ()

获取TS 27.007 8.5中定义的GSM误码率(0-7,99)

Returns
int

getGsmSignalStrength

Added in API level 7
int getGsmSignalStrength ()

获得GSM信号强度,有效值为(0-31,99),如TS 27.007 8.5中定义

Returns
int

getLevel

Added in API level 23
int getLevel ()

检索整体信号强度的抽象等级值。

Returns
int a single integer from 0 to 4 representing the general signal quality. This may take into account many different radio technology inputs. 0 represents very poor signal strength while 4 represents a very strong signal strength.

hashCode

Added in API level 7
int hashCode ()

返回对象的哈希码值。 为了散列表的好处而支持此方法,例如由HashMap提供的HashMap

hashCode的总合同是:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

尽可能合理实用,类Object定义的hashCode方法确实为不同的对象返回不同的整数。 (这通常通过将对象的内部地址转换为整数来实现,但Java TM编程语言不需要此实现技术。)

Returns
int hash code

isGsm

Added in API level 7
boolean isGsm ()

Returns
boolean true if this is for GSM

toString

Added in API level 7
String toString ()

返回对象的字符串表示形式。 通常, toString方法返回一个字符串,用于“文本地表示”此对象。 结果应该是一个简洁但内容丰富的表述,对于一个人来说很容易阅读。 建议所有子类重写此方法。

ObjecttoString方法返回一个字符串,其中包含对象为实例的类的名称,符号字符“ @ ”以及对象的哈希代码的无符号十六进制表示形式。 换句话说,这个方法返回一个字符串,其值等于:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Returns
String string representation.

writeToParcel

Added in API level 7
void writeToParcel (Parcel out, 
                int flags)

writeToParcel(Parcel, int)

Parameters
out Parcel: The Parcel in which the object should be written.
flags int: Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE.

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