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我在我的表单中实现了验证码，但是我得到了getImage（）方法的空指针异常。验证码中的空指针异常
我有两个验证码在项目中一个工作正常，但另一个显示以下错误。我不知道为什么它没有将验证码作为参数。
我在下面提供了logcat和mainactivity.java。
logcat的
FATAL EXCEPTION: main
Process: com.mws.tms_application, PID: 6983
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mws.tms_application/com.mws.tms_application.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap com.mws.tms_application.TextCaptcha.getImage()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap com.mws.tms_application.TextCaptcha.getImage()' on a null object reference
at com.mws.tms_application.MainActivity.onCreate(MainActivity.java:41)
at android.app.Activity.performCreate(Activity.java:6980)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
主要activity.java
package com.mws.tms_application;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView Registerlink;
Button Submit_btn ,Reset_btn,Link_btn;
EditText Username,Usermob,UserAddress,Usermailid,Userpass,Usercapt;
ActionBar actionBar;
ImageView imageView1;
TextCaptcha textCaptcha1;
//#2eb82e
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
Registerlink = (TextView) findViewById(R.id.loginlink);
Submit_btn=(Button)findViewById(R.id.Submit_btn);
Reset_btn=(Button)findViewById(R.id.Main_Reset_btn);
Username=(EditText)findViewById(R.id.username_edtext);
Usermob=(EditText)findViewById(R.id.usermob_no_edtext);
UserAddress=(EditText)findViewById(R.id.userAddresss_edtext);
Usermailid=(EditText)findViewById(R.id.usermailid_edtext);
Userpass=(EditText)findViewById(R.id.userpass_edtext);
Usercapt=(EditText)findViewById(R.id.usercapt_edtext);
Link_btn=(Button)findViewById(R.id.Link_btn);
imageView1=(ImageView)findViewById(R.id.register_capt_imageview);
imageView1.setImageBitmap(textCaptcha1.getImage());
actionBar=getSupportActionBar();
actionBar.show();
actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#2eb82e")));
MainLogic();
}
private void MainLogic()
{ Link_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(MainActivity.this,Home_Navigation_Activity.class);
startActivity(i);
}
});
Submit_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isValidData();
}
});
Reset_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
claredata();
}
});
Registerlink.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(MainActivity.this,Login_Activity.class);
startActivity(i);
}
});
}
/* Userid,Username,usermob,userAddress,usermailid,userpass,usercapt;*/
public boolean isValidData()
{
String id,name,mobile,address,email,password,captch;
name=Username.getText().toString();
mobile=Usermob.getText().toString();
address=UserAddress.getText().toString();
email=Usermailid.getText().toString();
password=Userpass.getText().toString();
/*captch=Usercapt.getText().toString();*/
if (!name.equals("")&&!mobile.equals("")&&mobile.length()>=10&&mobile.length()<=13&&!address.equals("")&&!email.equals("")&&!password.equals(""))
{
if (validEmail((email)))
{
return true;
}
else
{
AlertDialog.Builder alt=new AlertDialog.Builder(MainActivity.this);
alt.setMessage("Invalid Email_Id");
alt.setCancelable(true);
alt.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog=alt.create();
alertDialog.show();
return false;
}
}
else
{
AlertDialog.Builder alt=new AlertDialog.Builder(MainActivity.this);
alt.setMessage("Please fill all details");
alt.setCancelable(true);
alt.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alertDialog=alt.create();
alertDialog.show();
}
return false;
}
public boolean claredata()
{
Username.setText("");
Usermob.setText("");
UserAddress.setText("");
Usermailid.setText("");
Userpass.setText("");
/*captch=Usercapt.getText().toString();*/
return false;
}
private boolean validEmail(String email) {
final String emailPattern = "[a-zA-Z0-9._-][email protected][a-z]+\\.+[a-z]+";
if (email.trim().matches(emailPattern))
{
return true;
}
return false;
}
}