单击按钮时在 startActivity 上崩溃

Question

Having the same issue. The button is initialized at the right time but for some reason, it crashes on click. The xml file says the onClick handler is missing the related activity.

xml

<Button
    android:id="@+id/start_reg_btn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="216dp"
    android:onClick="onClick"
    android:text="@string/need_a_new_account" />

Java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_start);

    mRegBtn = (Button) findViewById(R.id.start_reg_btn);

    mRegBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent reg_intent = new Intent(StartActivity.this, RegisterActivity.class);
            startActivity(reg_intent);
        }
    });
}

Very new to android programming. Any help is appreciated

Answer 1

There are two ways of solving your issue:

1. When you declare onClick handler in your XML, you need to implement the method in your activity.

In your case, you have declared an onClick handler for your button on XML with this line:

 android:onClick="onClick"

So, you now have to create a method name onClick() in your activity and do your code there like this:

public void onClick(View v) {
  Intent reg_intent = new Intent( StartActivity.this, RegisterActivity.class);
  startActivity(reg_intent);
}

2. Remove this line from your XML:

 android:onClick="onClick"

and do what you did already:

mRegBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent reg_intent = new Intent( StartActivity.this, RegisterActivity.class);
                startActivity(reg_intent);
            }
        });

So, the main concept is this you can't use android:onClick and setOnClickListener together. You have to use one at a time.

Answer 2

android:onClick and `setOnClickListener` can not used simultaneous.

To use android:onClick correctly, you could refer to the official link

Answer 3

Try getting current context using getContext() and implement as.

public void onClick(View v) {
    Intent reg_intent = new Intent(v.getContext(), RegisterActivity.class);
    v.getContext().startActivity(reg_intent);
}

And either define onClick from xml file or define it programmatically using View.setOnClickListener . Both can not co-exist.

Answer 4

Just Remove onClick from your Xml and try to run once again

Answer 5

Found the error that the TextEditinput.= TextInputLayout and that's why it was crashing. It was also working either by the onClick Method or SetuponClickListener so thank you for everyone and their help