从另一个工作活动复制的onClickListener不工作

Question

I have created a new activity, added it to my manifest file and copy and pasted code from another fully functioning activity yet my buttons do not work when I click on them. Here is my activity:

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;    

public class test extends Activity {

private Button btnChangeDate;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.salesticketoilui);
    mainProgram();
    }

public void mainProgram() {
    btnChangeDate = (Button) findViewById(R.id.btnChangeDate);
    btnChangeDate.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            showDialog(DATE_DIALOG_ID);
        } // end onClick
    }); // end setOnClickListener

    Button buttonExit = (Button)findViewById(R.id.buttonExit);
    buttonExit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
             exitActivity();          
        } // end onClick
    }); // end OnClickListener

    // setup button listener for saving data and exit to main
    Button buttonSaveExit = (Button) findViewById(R.id.buttonSaveExit);
    buttonSaveExit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            saveExit();
        } // end onClick
    }); // end OnClickListener

} // end MainProgram ()

    public void saveExit() {
        // does stuff
    }

    public void exitActivity () {
        // does stuff
    }

} // end class 

any thoughts?

Answer 1

Based on the code you have shown, it doesn't appear that you ever call the method mainProgram so your click listeners will never actually get setup. Either call mainProgram from onCreate or just put that code directly into onCreate .

Answer 2

我相信onClickListeners需要进入您的onCreate方法。

Answer 3

Listen to Scott

and looks like your missing the @Override

new View.OnClickListener() {
    @Override
    public void onClick(View view) {
         exitActivity();          
    } // end onClick
}

Make sure your java settings are to 1.6 to avoid code completion missing this.

Answer 4

I had the same problem copying OnClickListener with ImageButtons from a class to another class, and renaming then with bulk copy/paste. To make it work, I had to create new buttons in my layout and declare the events manually. Weird!