我制作了一个注册表单，其中包含一组文本字段和一个注册按钮。单击注册按钮时，它会检查任何空文本字段，如果存在，则返回 0 并再次启动活动。但问题是按钮点击事件只工作一次。下次单击按钮时，应用程序将关闭。
这是代码，
public class Register extends Activity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
Button btnRegister=(Button) findViewById(R.id.btnRegisterMe);
btnRegister.setOnClickListener(Register.this);
}
@Override
public void onClick(View v) {
if(v.getId()==R.id.btnRegisterMe)
{
int controlsCheck=CheckForEmptyTextBox();
if(controlsCheck==0)
{
Toast toastSome=Toast.makeText(Register.this, "Check the error", Toast.LENGTH_SHORT);
toastSome.show();
}
}
}
protected int CheckForEmptyTextBox()
{
int check;
EditText txtMobile=(EditText) findViewById(R.id.txtMobile);
EditText txtUsername=(EditText) findViewById(R.id.txtUsername);
EditText txtPassword=(EditText) findViewById(R.id.txtPassword);
if(txtMobile.length()==0)
{
txtMobile.setBackgroundColor(Color.RED);
Toast toastMobile=Toast.makeText(Register.this, "Enter Mobile Number", Toast.LENGTH_SHORT);
toastMobile.show();
check=0;
}
else if(txtUsername.length()==0)
{
txtUsername.setBackgroundColor(Color.RED);
Toast toastUsername=Toast.makeText(Register.this, "Enter Username", Toast.LENGTH_SHORT);
toastUsername.show();
check=0;
}
else if(txtPassword.length()==0)
{
txtPassword.setBackgroundColor(Color.RED);
Toast toastPassword=Toast.makeText(Register.this, "Enter Password", Toast.LENGTH_SHORT);
toastPassword.show();
check=0;
}
else
{
check=1;
}
if(check==0)
{
return check;
}
else
{
return check;
}
}
}
我想向用户保证他填写了所有字段。请告诉我如何处理android中同一个按钮的多次点击事件。
日志数据::
06-29 18:16:51.997: E/AndroidRuntime(5523): FATAL EXCEPTION: main
06-29 18:16:51.997: E/AndroidRuntime(5523): java.lang.NullPointerException
06-29 18:16:51.997: E/AndroidRuntime(5523): at com.example.restaurants.Register.CheckForEmptyTextBox(Register.java:74)
06-29 18:16:51.997: E/AndroidRuntime(5523): at com.example.restaurants.Register.onClick(Register.java:37)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.view.View.performClick(View.java:3534)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.view.View$PerformClick.run(View.java:14263)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.os.Handler.handleCallback(Handler.java:605)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.os.Handler.dispatchMessage(Handler.java:92)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.os.Looper.loop(Looper.java:137)
06-29 18:16:51.997: E/AndroidRuntime(5523): at android.app.ActivityThread.main(ActivityThread.java:4441)
06-29 18:16:51.997: E/AndroidRuntime(5523): at java.lang.reflect.Method.invokeNative(Native Method)
06-29 18:16:51.997: E/AndroidRuntime(5523): at java.lang.reflect.Method.invoke(Method.java:511)
06-29 18:16:51.997: E/AndroidRuntime(5523): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-29 18:16:51.997: E/AndroidRuntime(5523): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-29 18:16:51.997: E/AndroidRuntime(5523): at dalvik.system.NativeStart.main(Native Method)
06-29 18:23:27.667: D/TextLayoutCache(5704): Using debug level: 0 - Debug Enabled: 0
06-29 18:23:27.737: D/libEGL(5704): loaded /system/lib/egl/libGLES_android.so
06-29 18:23:27.797: D/libEGL(5704): loaded /system/lib/egl/libEGL_adreno200.so
06-29 18:23:27.867: D/libEGL(5704): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
06-29 18:23:27.877: D/libEGL(5704): loaded /system/lib/egl/libGLESv2_adreno200.so
06-29 18:23:28.117: D/OpenGLRenderer(5704): Enabling debug mode 0