博客

public class MoveDemoActivity extends Activity {

	private TextView tv;
	private Button bt;
	private boolean isEditMode;
	private ViewGroup root;

	private int startX;
	private int startY;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		root = (ViewGroup) findViewById(R.id.root);
		tv = (TextView) findViewById(R.id.tv);
		bt = (Button) findViewById(R.id.bt);

		bt.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				if (isEditMode) {
					bt.setText("点击模式");
				} else {
					bt.setText("编辑模式");
				}
				isEditMode = !isEditMode;
			}
		});

		tv.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				if (!isEditMode) {
					return false;
				}
				switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:
					// 获取手指按下的坐标
					startX = (int) event.getRawX();
					startY = (int) event.getRawY();
					break;
				case MotionEvent.ACTION_MOVE:
					// 获取手指移动到了哪个点的坐标
					int movingX = (int) event.getRawX();
					int movingY = (int) event.getRawY();
					// 相对于上一个点，手指在X和Y方向分别移动的距离
					int dx = movingX - startX;
					int dy = movingY - startY;
					// 获取TextView上一次上 下 左 右各边与父控件的距离
					int left = tv.getLeft();
					int right = tv.getRight();
					int top = tv.getTop();
					int bottom = tv.getBottom();
					// 设置本次TextView的上 下 左 右各边与父控件的距离
					tv.layout(left + dx, top + dy, right + dx, bottom + dy);
					// 本次移动的结尾作为下一次移动的开始
					startX = (int) event.getRawX();
					startY = (int) event.getRawY();
					break;
				case MotionEvent.ACTION_UP:
					break;
				}
				root.invalidate();
				return true;//如果返回true,从手指接触屏幕到手指离开屏幕，将不会触发点击事件。
			}
		});

		tv.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Toast.makeText(getApplicationContext(), "TextView Click", 0)
						.show();
			}
		});
	}

}