我正在尝试实施一个投掷手势。最终它将具有与原生Android联系人应用程序相同的功能，您将刷卡列表视图，它将打开拨号器。我有一个问题，但一切都100％。截至目前，listview正在加载，但经过大量谷歌搜索和教程后，我想出了这个并需要帮助。
SimpleGestureFilter
public final static int SWIPE_UP = 1;
public final static int SWIPE_DOWN = 2;
public final static int SWIPE_LEFT = 3;
public final static int SWIPE_RIGHT = 4;
public final static int MODE_TRANSPARENT = 0;
public final static int MODE_SOLID = 1;
public final static int MODE_DYNAMIC = 2;
private final static int ACTION_FAKE = -13; //just an unlikely number
private int swipe_Min_Distance = 100;
private int swipe_Max_Distance = 350;
private int swipe_Min_Velocity = 100;
private int mode = MODE_DYNAMIC;
private boolean running = true;
private boolean tapIndicator = false;
private Activity context;
private GestureDetector detector;
private SimpleGestureListener listener;
public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {
this.context = context;
this.detector = new GestureDetector(context, this);
this.listener = sgl;
}
public void onTouchEvent(MotionEvent event){
if(!this.running)
return;
boolean result = this.detector.onTouchEvent(event);
if(this.mode == MODE_SOLID)
event.setAction(MotionEvent.ACTION_CANCEL);
else if (this.mode == MODE_DYNAMIC) {
if(event.getAction() == ACTION_FAKE)
event.setAction(MotionEvent.ACTION_UP);
else if (result)
event.setAction(MotionEvent.ACTION_CANCEL);
else if(this.tapIndicator){
event.setAction(MotionEvent.ACTION_DOWN);
this.tapIndicator = false;
}
}
//else just do nothing, it's Transparent
}
public void setMode(int m){
this.mode = m;
}
public int getMode(){
return this.mode;
}
public void setEnabled(boolean status){
this.running = status;
}
public void setSwipeMaxDistance(int distance){
this.swipe_Max_Distance = distance;
}
public void setSwipeMinDistance(int distance){
this.swipe_Min_Distance = distance;
}
public void setSwipeMinVelocity(int distance){
this.swipe_Min_Velocity = distance;
}
public int getSwipeMaxDistance(){
return this.swipe_Max_Distance;
}
public int getSwipeMinDistance(){
return this.swipe_Min_Distance;
}
public int getSwipeMinVelocity(){
return this.swipe_Min_Velocity;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
final float xDistance = Math.abs(e1.getX() - e2.getX());
final float yDistance = Math.abs(e1.getY() - e2.getY());
if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
return false;
velocityX = Math.abs(velocityX);
velocityY = Math.abs(velocityY);
boolean result = false;
if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
if(e1.getX() > e2.getX()) // right to left
this.listener.onSwipe(SWIPE_LEFT);
else
this.listener.onSwipe(SWIPE_RIGHT);
result = true;
}
else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
if(e1.getY() > e2.getY()) // bottom to up
this.listener.onSwipe(SWIPE_UP);
else
this.listener.onSwipe(SWIPE_DOWN);
result = true;
}
return result;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
this.tapIndicator = true;
return false;
}
@Override
public boolean onDoubleTap(MotionEvent arg0) {
this.listener.onDoubleTap();;
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent arg0) {
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent arg0) {
if(this.mode == MODE_DYNAMIC){ // we owe an ACTION_UP, so we fake an
arg0.setAction(ACTION_FAKE); //action which will be converted to an ACTION_UP later.
this.context.dispatchTouchEvent(arg0);
}
return false;
}
static interface SimpleGestureListener{
void onSwipe(int direction);
void onDoubleTap();
}
}
DisplayCompanies.java
public class DisplayCompanies extends ListActivity {
//JSONArrays?
JSONArray directory;
private SimpleGestureFilter detector;
//JSON Node names
private static String TAG_ID = "id";
private static String TAG_COMPANY= "organization";
private static String TAG_PHONE= "number";
private static String TAG_CATEGORY= "companies";
private final static String url= "API URL BASE HERE";
JSONObject json;
CompanyListJSONParser jParser = new CompanyListJSONParser();
ArrayList<HashMap<String, String>> directoryList;
@SuppressLint("NewApi")
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.service);
directoryList = new ArrayList<HashMap<String, String>>();
Request request = new Request();
request.execute();
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
setTitle("Available Companies");
}
}// end of onCreate Method
@SuppressWarnings("unused")
public class Request extends AsyncTask<String, Void, JSONObject> {
private static final int REGISTRATION_TIMEOUT = 3 * 1000;
private static final int WAIT_TIMEOUT = 30 * 1000;
private ProgressDialog dialog =
new ProgressDialog(DisplayCompanies.this);
protected void onPreExecute() {
dialog = new ProgressDialog(DisplayCompanies.this);
dialog.setMessage("Getting Available Companies... Please wait...");
dialog.show();
}
protected JSONObject doInBackground(String... params) {
String cat = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
cat = extras.getString("catID");
}
String fullUrl = url + cat;
json = jParser.getJSONfromURL(fullUrl);
return json;
}
protected void onPostExecute(JSONObject s) {
super.onPostExecute(s);
String name = null;
String id = null;
String phone = null;
dialog.dismiss();
try {
directory = s.getJSONArray(TAG_CATEGORY);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for(int i = 0; i < directory.length(); i++){;
try {
id = directory.getJSONObject(i).getString(TAG_ID);
name = directory.getJSONObject(i).getString(TAG_COMPANY);
phone = directory.getJSONObject(i).getString(TAG_PHONE);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
displayCatList(id, name, phone);
}
}
}
public void displayCatList(String id, String name, String phone){
//create new HashMap
HashMap<String,String> map = new HashMap<String, String>();
//add each child node to HashMap key
map.put(TAG_ID, id);
map.put(TAG_COMPANY, name);
map.put(TAG_PHONE, phone);
//adding HashList to ArrarList
directoryList.add(map);
MySimpleAdapter adapter = new MySimpleAdapter(this, R.layout.list_item, android.R.id.text1, directoryList);
setListAdapter(adapter);
adapter.notifyDataSetChanged();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
public class MySimpleAdapter extends ArrayAdapter<HashMap<String, String>> {
List<HashMap<String, String>> listItems;
public MySimpleAdapter(Context context, int resource,
int textViewResourceId, List<HashMap<String, String>> objects) {
super(context, resource, textViewResourceId, objects);
listItems = objects;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView == null) {
LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflator.inflate(R.layout.list_item, null);
}
TextView listName = (TextView) convertView.findViewById(R.id.listName);
listName.setTag(listItems.get(position).get(TAG_ID));
listName.setText(listItems.get(position).get(TAG_COMPANY));
//for use with onClick
listName.setOnClickListener(new OnClickListener() {
@Override
/**
* Method provides action when the selected item in list view is clicked.
*/
public void onClick(View v){
Log.i("Click", "id # " + listItems.get(position).get(TAG_ID) + " Company: " + listItems.get(position).get(TAG_COMPANY)+ " Phone #: " + listItems.get(position).get(TAG_PHONE));
//Intent DisplayCompanies = new Intent (DisplayServiceActivity.this, DisplayCompanies.class);
//DisplayServiceActivity.this.startActivity(DisplayCompanies);
}
});
//Gesture or fling implementation
detector = new SimpleGestureFilter(this,this);
return convertView;
}
public boolean dispatchTouchEvent(MotionEvent me){
detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
public void onSwipe(int direction) {
String str = "";
switch (direction) {
case SimpleGestureFilter.SWIPE_RIGHT : str = "Swipe Right";
break;
case SimpleGestureFilter.SWIPE_LEFT : str = "Swipe Left";
break;
case SimpleGestureFilter.SWIPE_DOWN : str = "Swipe Down";
break;
case SimpleGestureFilter.SWIPE_UP : str = "Swipe Up";
break;
}
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
public void onDoubleTap() {
Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show();
}
}
}
}
此时Eclipse将无法编译，这些是带下划线的内容：
public boolean dispatchTouchEvent(MotionEvent me){
detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
因为：方法dispatchTouchEvent（MotionEvent）未定义类型ArrayAdapter＆gt;
和
Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show();
因为：Toast类型中的方法makeText（Context，CharSequence，int）不适用于参数（DisplayCompanies.MySimpleAdapter，String，int）
对此的任何帮助都会很棒。提前谢谢你们！
答案 0 :(得分：0)
您不断制作新的手势过滤器，并使用此代码一遍又一遍地分配它们。
//Gesture or fling implementation
detector = new SimpleGestureFilter(this,this);
您应该为每个视图制作一个手势检测器，而不是ListView