我不知道为什么 Android/Java 会这样做,这很难想,因为我非常疲倦,目前无法独立思考。
我正在创建静态函数并以这种方式输入和执行代码,我认为这不是原因,因为它甚至还没有通过 if 语句;大家怎么看?我敢打赌这是一个简单的解决方案,我只是无法为我的生活弄明白。
代码:
public class LogIn extends Activity {
Button login;
EditText user;
EditText pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
TextView top = (TextView) findViewById(R.id.textView2);
EditText user = (EditText) findViewById(R.id.etUser);
EditText pass = (EditText) findViewById(R.id.etPass);
CheckBox stay = (CheckBox) findViewById(R.id.cBStay);
Button login = (Button) findViewById(R.id.btLogin);
Process();
}
private void Process() {
// TODO Auto-generated method stub
login.setOnClickListener( new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String user1 = user.getText().toString();
String pass1 = pass.getText().toString();
if(user1 !=null &user1.length()>=1 & pass1 !=null &pass1.length()>=1) {
ComHelper.SendLogin(user1, pass1);
}
}
});
}
}
日志猫:
06-03 22:34:01.178: E/AndroidRuntime(2599): FATAL EXCEPTION: main
06-03 22:34:01.178: E/AndroidRuntime(2599): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gta5news.qwuik/com.gta5news.qwuik.LogIn}: java.lang.NullPointerException
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.os.Handler.dispatchMessage(Handler.java:99)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.os.Looper.loop(Looper.java:137)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-03 22:34:01.178: E/AndroidRuntime(2599): at java.lang.reflect.Method.invokeNative(Native Method)
06-03 22:34:01.178: E/AndroidRuntime(2599): at java.lang.reflect.Method.invoke(Method.java:511)
06-03 22:34:01.178: E/AndroidRuntime(2599): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-03 22:34:01.178: E/AndroidRuntime(2599): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-03 22:34:01.178: E/AndroidRuntime(2599): at dalvik.system.NativeStart.main(Native Method)
06-03 22:34:01.178: E/AndroidRuntime(2599): Caused by: java.lang.NullPointerException
06-03 22:34:01.178: E/AndroidRuntime(2599): at com.gta5news.qwuik.LogIn.Process(LogIn.java:32)
06-03 22:34:01.178: E/AndroidRuntime(2599): at com.gta5news.qwuik.LogIn.onCreate(LogIn.java:26)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.Activity.performCreate(Activity.java:4465)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-03 22:34:01.178: E/AndroidRuntime(2599): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)