我的应用程序不打开，强制关闭

Question

我的应用程序一打开就关闭了，这是我的第一个应用程序，我试图查找错误，但是自从启动这个应用程序之后，我无法附加日志猫：

          12-03 16:04:54.040: W/dalvikvm(8798): threadid=1: thread exiting with uncaught exception (group=0x40018578)
          12-03 16:04:54.040: E/AndroidRuntime(8798): FATAL EXCEPTION: main
          12-03 16:04:54.040: E/AndroidRuntime(8798): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sditya.quadratic.equation/com.sditya.quadratic.equation.Quadratic}: java.lang.NullPointerException
          ...
          12-03 16:04:54.040: E/AndroidRuntime(8798): Caused by: java.lang.NullPointerException
          12-03 16:04:54.040: E/AndroidRuntime(8798):   at com.sditya.quadratic.equation.Quadratic.initialize(Quadratic.java:58)

初始化方法：

private void initialize() { 
// TODO Auto-generated method stub
tr = (TextView) findViewById(R.id.tvResults); 
xs = (EditText) findViewById(R.id.editText1);
x = (EditText) findViewById(R.id.editText2); 
c = (EditText) findViewById(R.id.editText3); 
b.setOnClickListener(this); 
} 

编辑：解决了，我忘了充气按钮'b‘。

Answer 1

在initialize方法中，需要在设置侦听器之前设置按钮变量。

private void initialize() { 
// TODO Auto-generated method stub
tr = (TextView) findViewById(R.id.tvResults); 
xs = (EditText) findViewById(R.id.editText1);
x = (EditText) findViewById(R.id.editText2); 
c = (EditText) findViewById(R.id.editText3); 

b = (Button) findViewById(R.id.button1); 
b.setOnClickListener(this); 
}