如何将微调器值发送到下一页？

Question

需要立即答复..

sem.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
            // TODO Auto-generated method stub
            sems = sem.getSelectedItem().toString();
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }

    });

然后是这个

pasa.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        //Starting a new Intent
        Intent nextScreen = new Intent(getApplicationContext(), semis.class);
        //Sending data to another Activity

        nextScreen.putExtra("semss", sems.toString());

        finish();
        startActivity(nextScreen);
    }
});

我遇到了困难.. 一个错误.. 我的模拟器在我点击按钮后被强制关闭.. 我该怎么办？ 谢谢

Answer 1

pasa.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        //Starting a new Intent
        Intent nextScreen = new Intent(getApplicationContext(), semis.class);
        //Sending data to another Activity
        nextScreen.putExtra("semss", sems.toString());
        startActivity(nextScreen);
        finish();  // this is the last statement ever
    }
});

Answer 2

您应该在开始新活动之后调用finish()，而不是之前。

像这样：

pasa.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        //Starting a new Intent
        Intent nextScreen = new Intent(getApplicationContext(), semis.class);
        //Sending data to another Activity

        nextScreen.putExtra("semss", sems.toString());
        startActivity(nextScreen);
        finish();

    }
});