到目前为止，我可以从图库中检索图像，我可以滑动。但是我希望滑动功能可以到达左侧的画廊的下一个图像。请帮帮我。
import java.io.InputStream;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;
import com.application.arkhid.SimpleGestureFilter.SimpleGestureListener;
public class MainActivity extends Activity implements SimpleGestureListener, OnClickListener{
private SimpleGestureFilter detector;
private static final int REQUEST_ID = 1;
private static final int HALF = 2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.browse_button).setOnClickListener(this);
detector = new SimpleGestureFilter(this,this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(intent, REQUEST_ID);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
InputStream stream = null;
if (requestCode == REQUEST_ID && resultCode == Activity.RESULT_OK) {
try {
stream = getContentResolver().openInputStream(data.getData());
Bitmap original = BitmapFactory.decodeStream(stream);
((ImageView)findViewById(R.id.image_holder)).setImageBitmap(Bitmap.createScaledBitmap(original,
original.getWidth()/HALF, original.getHeight()/HALF, true));
}
catch (Exception e) {
e.printStackTrace();
}
if (stream != null) {
try {
stream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent me){
// Call onTouchEvent of SimpleGestureFilter class
this.detector.onTouchEvent(me);
return super.dispatchTouchEvent(me);
}
@Override
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();
}
@Override
public void onDoubleTap() {
Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show();
}
}
import android.app.Activity;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
public class SimpleGestureFilter extends SimpleOnGestureListener{
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 = 50;
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 arg) {
this.listener.onDoubleTap();;
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent arg) {
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent arg) {
if(this.mode == MODE_DYNAMIC){ // we owe an ACTION_UP, so we fake an
arg.setAction(ACTION_FAKE); //action which will be converted to an ACTION_UP later.
this.context.dispatchTouchEvent(arg);
}
return false;
}
static interface SimpleGestureListener{
void onSwipe(int direction);
void onDoubleTap();
}
}