Question

我的代码存在问题。我想使用提交按钮打开下一个活动，但我遇到了问题。任何人都可以帮助我解决我所犯的错误，以便我可以实现它吗？感谢

    public class Chairperson extends Activity implements        View.OnClickListener{
    TextView textView;
    Button submit_btn;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_chairperson);
    submit_btn = (Button) findViewById(R.id.submit_btn);
    submit_btn.setOnClickListener(this);
    textView = (TextView) findViewById(R.id.welcome_txt);
    String message = getIntent().getStringExtra("message");
    textView.setText(message);
    Button submit_btn = (Button) findViewById(R.id.submit_btn);
    final TextView submitTextView = (TextView)  findViewById(R.id.submitTextView);

    final RadioGroup rg1 = (RadioGroup) findViewById(R.id.rg1);

    submit_btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Get the checked Radio Button ID from Radio Grou[
            int selectedRadioButtonID = rg1.getCheckedRadioButtonId();

            // If nothing is selected from Radio Group, then it return -1
            if
                    (selectedRadioButtonID != -1) {
                RadioButton selectedRadioButton = (RadioButton) findViewById(selectedRadioButtonID);
                String selectedRadioButtonText = selectedRadioButton.getText().toString();
                submitTextView.setText(selectedRadioButtonText + "  selected.");

            } else {
                submitTextView.setText("Nothing selected .");
            }
          }

        });


    }

       @Override
       public void onClick(View v) {
       startActivity(new Intent(this, ViceChairperson.class));
        }
      }

Answer 1

我已经为您的按钮编写了代码，删除了代码中所有以前的submit_btn代码并替换为

 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addListenerOnButton();

public void addListenerOnButton() {
final Context context = this;
submit_btn = (Button) findViewById(R.id.submit_btn);

submit_btn.setOnClickListener(new OnClickListener() {
@Override
        public void onClick(View arg0) {
       if (radioGroup.getCheckedRadioButtonId() == -1)
 {
 Toast.makeText(context, "Select an option.", Toast.LENGTH_LONG).show();
 }
 else{
            Intent intent = new Intent(context, ViceChairperson.class);
            startActivity(intent);
            finish();

        }
 }
 });

}
}

如果您有任何问题，请告诉我。

Answer 2

移动线

startActivity(new Intent(getApplicationContext(), ViceChairperson.class));

在if (selectedRadioButtonID != -1)检查后

。
如果检查成功则启动新活动，如果没有，则不启动任何活动不需要第二个onClick方法，它不受任何约束，永远不会被调用。

打开下一个活动

2 个答案: