【发布时间】：2013-01-20 06:40:13
【问题描述】：
我为 Name 、 body weight 和 height 创建了三个编辑文本视图 姓名采用 PersonName 值，体重和身高采用数字值 我正在使用以下代码来检查 EditText 视图是否为空的天气。正如您在下面看到的那样，如果代码块为空，我尝试了所有方法，但是当我将 editText 视图留空时，应用程序仍然崩溃。可能会出什么问题？
if(getName.equals("") || getName.length()<=2 || getName.equals(null) || getName.trim().length()<1)
{
NameWarning.setText("Please Enter Your Name Correctly");
}
else if(heightcm.getText().toString().equals("") || heightcm.getText()==null || heightcm.getText().toString().equals(null) || heightcm.getText().toString().trim().length()<1)
{
HeightWarning.setText("Please Enter Your Height Correctly");
}
else if(getWeight.getText().toString().equals("") || getWeight.getText().toString()==null || getWeight.getText().toString().equals(null) || getWeight.getText().toString().trim().length()<1)
{
WeightWarning.setText("Please Enter Your Weight Correctly");
}
else if (getName.equals("") || heightcm.getText().toString().equals("") || getWeight.getText().toString().equals("") || getName==null || heightcm.getText().toString()==null || getWeight.getText().toString()==null || getName.equals(null) || heightcm.getText().toString().equals(null) || getWeight.getText().toString().equals(null)
|| getName.trim().length()<1 || heightcm.getText().toString().trim().length()<1 || getWeight.getText().toString().trim().length()<1)
{
NameWarning.setText("Please Fill Your Details Correctly !!");
HeightWarning.setText("Please Fill Your Details Correctly !!");
WeightWarning.setText("Please Fill Your Details Correctly !!");
}
当应用程序崩溃时我正在获取此文件
// Compiled from Integer.java (version 1.5 : 49.0, super bit)
// Signature: Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;
public final class java.lang.Integer extends java.lang.Number implements java.lang.Comparable {
// Field descriptor #11 I
public static final int MAX_VALUE = 2147483647;
// Field descriptor #11 I
public static final int MIN_VALUE = -2147483648;
// Field descriptor #11 I
public static final int SIZE = 32;
// Field descriptor #19 Ljava/lang/Class;
// Signature: Ljava/lang/Class<Ljava/lang/Integer;>;
public static final java.lang.Class TYPE;
// Method descriptor #23 (I)V
// Stack: 3, Locals: 2
public Integer(int value);
0 aload_0 [this]
1 invokespecial java.lang.Number() [1]
4 new java.lang.RuntimeException [2]
7 dup
8 ldc <String "Stub!"> [3]
10 invokespecial java.lang.RuntimeException(java.lang.String) [4]
13 athrow
Line numbers:
[pc: 0, line: 6]
Local variable table:
[pc: 0, pc: 14] local: this index: 0 type: java.lang.Integer
[pc: 0, pc: 14] local: value index: 1 type: int
// Method descriptor #30 (Ljava/lang/String;)V
// Stack: 3, Locals: 2
public Integer(java.lang.String string) throws java.lang.NumberFormatException;
0 aload_0 [this]
1 invokespecial java.lang.Number() [1]
4 new java.lang.RuntimeException [2]
7 dup
8 ldc <String "Stub!"> [3]
10 invokespecial java.lang.RuntimeException(java.lang.String) [4]
13 athrow
Line numbers:
[pc: 0, line: 7]
Local variable table:
[pc: 0, pc: 14] local: this index: 0 type: java.lang.Integer
[pc: 0, pc: 14] local: string index: 1 type: java.lang.String
// Method descriptor #36 ()B
// Stack: 3, Locals: 1
public byte byteValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 8]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #38 (Ljava/lang/Integer;)I
// Stack: 3, Locals: 2
public int compareTo(java.lang.Integer object);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 9]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
[pc: 0, pc: 10] local: object index: 1 type: java.lang.Integer
// Method descriptor #41 (Ljava/lang/String;)Ljava/lang/Integer;
// Stack: 3, Locals: 1
public static java.lang.Integer decode(java.lang.String string) throws java.lang.NumberFormatException;
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 10]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
// Method descriptor #43 ()D
// Stack: 3, Locals: 1
public double doubleValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 11]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #45 (Ljava/lang/Object;)Z
// Stack: 3, Locals: 2
public boolean equals(java.lang.Object o);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 12]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
[pc: 0, pc: 10] local: o index: 1 type: java.lang.Object
// Method descriptor #49 ()F
// Stack: 3, Locals: 1
public float floatValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 13]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #41 (Ljava/lang/String;)Ljava/lang/Integer;
// Stack: 3, Locals: 1
public static java.lang.Integer getInteger(java.lang.String string);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 14]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
// Method descriptor #51 (Ljava/lang/String;I)Ljava/lang/Integer;
// Stack: 3, Locals: 2
public static java.lang.Integer getInteger(java.lang.String string, int defaultValue);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 15]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
[pc: 0, pc: 10] local: defaultValue index: 1 type: int
// Method descriptor #53 (Ljava/lang/String;Ljava/lang/Integer;)Ljava/lang/Integer;
// Stack: 3, Locals: 2
public static java.lang.Integer getInteger(java.lang.String string, java.lang.Integer defaultValue);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 16]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
[pc: 0, pc: 10] local: defaultValue index: 1 type: java.lang.Integer
// Method descriptor #55 ()I
// Stack: 3, Locals: 1
public int hashCode();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 17]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #55 ()I
// Stack: 3, Locals: 1
public int intValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 18]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #58 ()J
// Stack: 3, Locals: 1
public long longValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 19]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #60 (Ljava/lang/String;)I
// Stack: 3, Locals: 1
public static int parseInt(java.lang.String string) throws java.lang.NumberFormatException;
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 20]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
// Method descriptor #61 (Ljava/lang/String;I)I
// Stack: 3, Locals: 2
public static int parseInt(java.lang.String string, int radix) throws java.lang.NumberFormatException;
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 21]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
[pc: 0, pc: 10] local: radix index: 1 type: int
// Method descriptor #64 ()S
// Stack: 3, Locals: 1
public short shortValue();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 22]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #66 (I)Ljava/lang/String;
// Stack: 3, Locals: 1
public static java.lang.String toBinaryString(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 23]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #66 (I)Ljava/lang/String;
// Stack: 3, Locals: 1
public static java.lang.String toHexString(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 24]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #66 (I)Ljava/lang/String;
// Stack: 3, Locals: 1
public static java.lang.String toOctalString(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 25]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #71 ()Ljava/lang/String;
// Stack: 3, Locals: 1
public java.lang.String toString();
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 26]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type: java.lang.Integer
// Method descriptor #66 (I)Ljava/lang/String;
// Stack: 3, Locals: 1
public static java.lang.String toString(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 27]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #72 (II)Ljava/lang/String;
// Stack: 3, Locals: 2
public static java.lang.String toString(int i, int radix);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 28]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
[pc: 0, pc: 10] local: radix index: 1 type: int
// Method descriptor #41 (Ljava/lang/String;)Ljava/lang/Integer;
// Stack: 3, Locals: 1
public static java.lang.Integer valueOf(java.lang.String string) throws java.lang.NumberFormatException;
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 29]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
// Method descriptor #51 (Ljava/lang/String;I)Ljava/lang/Integer;
// Stack: 3, Locals: 2
public static java.lang.Integer valueOf(java.lang.String string, int radix) throws java.lang.NumberFormatException;
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 30]
Local variable table:
[pc: 0, pc: 10] local: string index: 0 type: java.lang.String
[pc: 0, pc: 10] local: radix index: 1 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int highestOneBit(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 31]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int lowestOneBit(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 32]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int numberOfLeadingZeros(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 33]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int numberOfTrailingZeros(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 34]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int bitCount(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 35]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #81 (II)I
// Stack: 3, Locals: 2
public static int rotateLeft(int i, int distance);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 36]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
[pc: 0, pc: 10] local: distance index: 1 type: int
// Method descriptor #81 (II)I
// Stack: 3, Locals: 2
public static int rotateRight(int i, int distance);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 37]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
[pc: 0, pc: 10] local: distance index: 1 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int reverseBytes(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 38]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int reverse(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 39]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #75 (I)I
// Stack: 3, Locals: 1
public static int signum(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 40]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #87 (I)Ljava/lang/Integer;
// Stack: 3, Locals: 1
public static java.lang.Integer valueOf(int i);
0 new java.lang.RuntimeException [2]
3 dup
4 ldc <String "Stub!"> [3]
6 invokespecial java.lang.RuntimeException(java.lang.String) [4]
9 athrow
Line numbers:
[pc: 0, line: 41]
Local variable table:
[pc: 0, pc: 10] local: i index: 0 type: int
// Method descriptor #88 (Ljava/lang/Object;)I
// Stack: 2, Locals: 2
public bridge synthetic int compareTo(java.lang.Object x0);
0 aload_0 [this]
1 aload_1 [x0]
2 checkcast java.lang.Integer [5]
5 invokevirtual java.lang.Integer.compareTo(java.lang.Integer) : int [6]
8 ireturn
Line numbers:
[pc: 0, line: 2]
Local variable table:
[pc: 0, pc: 9] local: this index: 0 type: java.lang.Integer
[pc: 0, pc: 9] local: x0 index: 1 type: java.lang.Object
// Method descriptor #91 ()V
// Stack: 1, Locals: 0
static {};
0 aconst_null
1 putstatic java.lang.Integer.TYPE : java.lang.Class [7]
4 return
Line numbers:
[pc: 0, line: 47]
}
【问题讨论】：
-
“崩溃”不是对问题的有用描述。与其尝试许多 [随机] 事物，不如先确定什么问题是什么，以便确定具体的解决方案（针对实际问题）；可能存在异常和相关的堆栈跟踪。使用它。
-
另外 1. 一个有效的
toString将永远返回 null，因此检查它是没有意义的。 -
还有 2.
getNames.equals("") || getName == null很傻。它要么是错误的，要么是无效的；布尔运算符是左结合的；到应用空值检查时，已经为时已晚，无法阻止 NPE。