我有一个List类和一个Viewflipper类，如何知道在Viewflipper类的List类中点击了哪个Item，如果可能的话，我还想将每个视图链接到Viewflipper的特定视图。这是我到目前为止所尝试的：
列表类：
public class List extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// storing string resources into Array
String[] service_list = getResources().getStringArray(R.array.List);
// Binding resources Array to ListAdapter
this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list, R.id.list, service_list));
}
@Override
protected void onListItemClick(ListView parent, View v, int position, long id) {
// TODO Auto-generated method stub
String name = (String) parent.getItemAtPosition(position);
//Toast.makeText(this, "you have clicked " + name, Toast.LENGTH_SHORT).show();
switch (position) {
case 0:
Intent i = new Intent(List.this, Viewflipper.class);
Bundle b = new Bundle();
b.putString("a", "apple");
i.putExtras(b);
startActivity(i);
break;
case 1:
Intent a = new Intent(List.this, Viewflipper.class);
Bundle aa = new Bundle();
aa.putString("b", "banana");
a.putExtras(aa);
startActivity(a);
break;
case 2:
Intent ab = new Intent(List.this, Viewflipper.class);
Bundle bb = new Bundle();
bb.putString("m", "mango");
ab.putExtras(bb);
startActivityForResult(ab, 2);
break;
case 3:
Intent c = new Intent(List.this, Viewflipper.class);
Bundle cc = new Bundle();
cc.putString("o", "orange");
c.putExtras(cc);
startActivity(c);
break;
default:
break;
}
super.onListItemClick(parent, v, position, id);
}
}
ViewFlipper类：
public class Viewflipper extends Activity implements OnClickListener,
OnGestureListener {
private ViewFlipper viewflipper;
private Button btnNext, btnPrevious;
private GestureDetector gesturedetector = null;
TextView txt;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewflipper);
viewflipper = (ViewFlipper) findViewById(R.id.viewSwitcher);
btnNext = (Button) findViewById(R.id.btnNext);
btnPrevious = (Button) findViewById(R.id.btnPrevious);
txt = (TextView) findViewById(R.id.txtview);
txt.setOnClickListener(this);
btnNext.setOnClickListener(this);
btnPrevious.setOnClickListener(this);
gesturedetector = new GestureDetector(this, this);
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
if (bundle.getString("a").equals("apple")) {
Toast.makeText(this, " the first Item was clicked ",
Toast.LENGTH_LONG).show();
} else if (bundle.getString("b").equals("banana")) {
Toast.makeText(this, "the second Item was clicked",
Toast.LENGTH_LONG).show();
} else if (bundle.getString("m").equals("mango")) {
Toast.makeText(this, "the fourth Item was clicked",
Toast.LENGTH_LONG).show();
} else if (bundle.getString("o").equals("orange")) {
Toast.makeText(this, "the fifth Item was clicked",
Toast.LENGTH_LONG).show();
}
else {
} // Toast.makeText(this, b , Toast.LENGTH_SHORT).show() ;
}
}
// Animation
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnNext:
// Button Next Style
Animation animationNext = AnimationUtils.loadAnimation(this,
R.anim.btn_style_next);
btnNext.startAnimation(animationNext);
nextView();
break;
case R.id.btnPrevious:
// Button Previous Style
Animation animationPrevious = AnimationUtils.loadAnimation(this,
R.anim.btn_style_previous);
btnPrevious.startAnimation(animationPrevious);
previousView();
break;
case R.id.txtview:
Toast.makeText(this, "dail contact or visit website",
Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return gesturedetector.onTouchEvent(event);
}
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
int SWIPE_MIN_VELOCITY = 100;
int SWIPE_MIN_DISTANCE = 100;
// Sự kiện khi bạn vuốt màn hình đưa sang một bên nào đó
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// Get Position
float ev1X = e1.getX();
float ev2X = e2.getX();
// Get distance of X (e1) to X (e2)
final float xdistance = Math.abs(ev1X - ev2X);
// Get veclocity of cusor
// Vận tốc = số điểm ảnh (px) / giây
final float xvelocity = Math.abs(velocityX);
// Vận tốc chuyển đổi X > 100 và khoảng cách từ điểm kéo đầu đến điểm
// kéo cuối > 100
if ((xvelocity > SWIPE_MIN_VELOCITY)
&& (xdistance > SWIPE_MIN_DISTANCE)) {
if (ev1X > ev2X)// Switch Left
{
previousView();
} else// Switch Right
{
nextView();
}
}
return false;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
// Next, Previous Views
private void previousView() {
// Previous View
viewflipper.setInAnimation(this, R.anim.in_animation1);
viewflipper.setOutAnimation(this, R.anim.out_animation1);
viewflipper.showPrevious();
}
private void nextView() {
// Next View
viewflipper.setInAnimation(this, R.anim.in_animation);
viewflipper.setOutAnimation(this, R.anim.out_animation);
viewflipper.showNext();
}
}
请帮忙。谢谢。
答案 0 :(得分：0)
首先，我建议您更改List代码，如下所示：
switch (position) {
Intent i = new Intent(List.this, Viewflipper.class);
case 0:
i.putExtra ("key", "apple");
startActivity(i);
break;
case 1:
i.putExtra ("key", "banana");
startActivity(i);
break;
case 2:
i.putExtra ("key", "mango");
startActivity(i);
break;
case 3:
i.putExtra ("key", "orange");
startActivity(i);
break;
default:
break;
}
然后在Viewflipper中，更改您的代码，使其如下所示：
if (getIntent().hasExtra("key")) {
String extra = getIntent().getStringExtra ("key");
if ("apple".equals (extra)){
Toast.makeText(this, " the first Item was clicked ",
Toast.LENGTH_LONG).show();
} else if ("banana".equals (extra)){
Toast.makeText(this, "the second Item was clicked",
Toast.LENGTH_LONG).show();
} else if ("mango".equals (extra)){
Toast.makeText(this, "the fourth Item was clicked",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "the fifth Item was clicked",
Toast.LENGTH_LONG).show();
}
}
我改变了什么：
Intent，以保存一些代码。Intent#putExtra()和Intent#getStringExtra()没问题。"string".equals (stringVariable)方法String#equals()以来，null方法可以处理NPE值而不会抛出{{1}}。