Question

我的.java文件确实令人费解：当用户触摸屏幕时，我希望发生两件事。

首先，必须出现触摸事件的坐标
其次，必须出现textView的坐标

在我的代码中，只会出现其中一个。以下是我的.java文件。

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    //**Part 1 begins here
        final TextView textView = (TextView)findViewById(R.id.textView1);
        final View touchLayout = findViewById(R.id.touchLayout);
        touchLayout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                textView.setText("Touch coordinates : " +
                    String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));
                    return true;
            }
            });
    //**Part 1 ends here

    //**Part 2 begins here      
        final TextView touchView = (TextView) findViewById(R.id.touchView);
        final TextView viewLocat = (TextView)findViewById(R.id.viewLocat);
        touchLayout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                    int[] viewLocation = new int[2];
                    touchView.getLocationOnScreen(viewLocation);
                    viewLocat.setText(String.valueOf(viewLocation[0]) + "x" + String.valueOf(viewLocation[1]));
                return true;
            }
            });
    }
    //**Part 2 ends here

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
    return true;
        }

    }

如果我运行这样的代码，则只发生第2部分（显示TextView坐标，但未显示接触点坐标）。如果我使用//使第2部分静音，第1部分就完美了。我完全不知道为什么会发生这种情况，是否有人碰巧知道如何解决这个问题？

Answer 1

您通过两次调用touchLayout.setOnTouchListener来覆盖OnTouchListener。也许将代码从第一个监听器移到第二个监听器？

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final TextView textView = (TextView)findViewById(R.id.textView1);
    final View touchLayout = findViewById(R.id.touchLayout);
    final TextView touchView = (TextView) findViewById(R.id.touchView);
    final TextView viewLocat = (TextView)findViewById(R.id.viewLocat);
    touchLayout.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Touch coordinates : " +
                String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));

            int[] viewLocation = new int[2];
            touchView.getLocationOnScreen(viewLocation);
            viewLocat.setText(String.valueOf(viewLocation[0]) + "x" +     String.valueOf(viewLocation[1]));
            return true;
        }
    });
}

只有一部分代码一次工作 - onTouchListener的问题？

1 个答案: