android - 如何在android中设置手指触摸功能？

Question

我正在 android 中开发一个小应用程序，其中我的应用程序中几乎没有图像我想要当用户用一根手指触摸时图像可以向左或向右移动，当用户可以用两根手指触摸时它可以缩放我怎么能这样做请为我引用一些教程代码。这是我的代码我在 xml v fdjf 中使用了 view flipper

public class Jaap extends Activity implements OnTouchListener{

float downXValue;
int counter = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);

// Set main.XML as the layout for this Activity
setContentView(R.layout.jaap);

// Add these two lines
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this); 

// Add a few countries to the spinner

}

public boolean onTouch(View arg0, MotionEvent arg1) {

// Get the action that was done on this touch event
switch (arg1.getAction())
{
case MotionEvent.ACTION_DOWN:
{
// store the X value when the user's finger was pressed down
downXValue = arg1.getX();
break;
}

case MotionEvent.ACTION_UP:
{
// Get the X value when the user released his/her finger
float currentX = arg1.getX(); 

// going backwards: pushing stuff to the right
if (downXValue < currentX)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
// vf.setAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
// Flip!
if(counter > 0){
vf.showPrevious();
counter--;
}
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
// vf.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
// Flip!
if(counter < 131){
vf.showNext();
counter++;
}
}
break;
}
}

// if you return false, these actions will not be recorded
return true;
}
}

Answer 1

查看 this分步教程，它包含如何放大/缩小图片并四处移动的代码示例。