Question

我想在按下按钮时打印一些东西（而不是在它被释放后）。我有这个，但它只能工作一次......

button.setOnTouchListener(new View.OnTouchListener() {
    public boolean onTouch(View v, MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN) {
            System.out.println("pressed");
            return true;
        }
        return false;
    }
});

Answer 1

尝试按此按钮时连续打印按下的信息。

button.setOnTouchListener(new View.OnTouchListener() {
    public boolean onTouch(View v, MotionEvent event) {
            System.out.println("pressed");
            return false;
    }
});

Answer 2

System.out在Android设备中不起作用（不会在设备上显示任何内容）如果您有文本视图，则可以在MotionEvent.ACTION_DOWN上设置文本，并在MotionEvent.ACTION_UP上设置文本视图的文本为空。像这样：

public class TestActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        final TextView textView = (TextView) findViewById(R.id.textview);
        final Button button = (Button) findViewById(R.id.button);
        button.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_DOWN){
                    textView.setText("Button Pressed");
                }
                if(event.getAction() == MotionEvent.ACTION_UP){
                    textView.setText(""); //finger was lifted
                }
                return true;
            }

        });
    }

}

按下按钮android

2 个答案: