android - Toast 和 onOnclick，toast k 不会显示

Question

有谁知道为什么这个程序不显示 toast 消息？

public class Main extends Activity implements OnClickListener{
/** Called when the activity is first created. */


  ImageButton x = (ImageButton) findViewById(R.id.imageButton1);
  ImageButton i = (ImageButton) findViewById(R.id.imageButton2);
  ImageButton question = (ImageButton) findViewById(R.id.imageButton3);

我创建了一些 ImageButons 和其他元素并创建了 onClick 函数

public void onClick(View v) {
            if(v.getId() == R.id.button1) // this works 
            {
                Intent intent = new Intent(this, Second.class);
                intent.putExtra("thetext", et1.getText().toString());
                intent.putExtra("thesize", et2.getText().toString());
                startActivity(intent);
            }
            if(v.getId() == R.id.imageButton2) // this wont work 
            {
                Toast toastI = Toast.makeText(this, "Testing", 5000);
                toastI.setGravity(Gravity.CENTER, 0, 0);
                toastI.show();
            }

当我点击 ImageButton i(在我运行程序之后)时，toast 不会显示？

Answer 1

希望你已经在 imagebuttons 上设置了 onclickListener..

  i.setOnClickListener(this);

试试这个

Toast.makeText(getApplication(), "Testing", 5000).show();