How i can change postion of the button randomly in

问题:

It gives me an error here that setX(int) is not defined though it is button type.

public class TouchMe extends Activity implements View.OnClickListener {

    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.tuchme);

            btn = (Button) findViewById(R.id.btn);

            btn.setOnClickListener(this);

    }

    public void onClick(View v) {
            // TODO Auto-generated method stub
            switch (v.getId()) {
            case (R.id.btn): {
                    Random r = new Random();
                    int x = r.nextInt(480 - buttonWidth);
                    int y = r.nextInt(800 - buttonHeight);

                    btn.setX(x);   // give me error here that setX(int) is not defined      
                    btn.setY(y);   // is button type.

            }

            }

It gives me error here that setX(int) is not defined is button type. please help me.

回答1:

View.setX() and View.setY() are only available as of API level 11 (Android 3.0 Honeycomb). You have to set minSdkVersion and targetSdkVersion accordingly and compile against API level 11 if you want to use these methods.