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Android TouchListener實現拖拽刪實例代碼
如果為一個控件設置了該觸摸監聽， 控件會隨著用戶的拖動而移動， 如果拖動的距離大過設置的臨界值， 那么當松開手指時會有回調onDragComplete, 用戶可在該方法中將該控件從父布局中刪除， 或這進行其他操作。 如果用戶拖拽的距離小于臨界值， 那么當用戶松開手指時控件會回談到原來的初始位置。這時會觸發onDragRebound回調。 如果用戶觸摸控件之后沒有拖拽而是直接松開手指， 會觸發onClick回調， 這樣用戶就不用為該控件設置onClick監聽。
源碼如下：
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by zhangjg on 14-10-10.
*/
public class DragTouchListener implements View.OnTouchListener {
/**
* drag directions
*/
public static final int DIRECTION_UP = 0;
public static final int DIRECTION_DOWN = 1;
public static final int DIRECTION_LEFT = 2;
public static final int DIRECTION_RIGHT = 3;
private int mDragDirection = -1;
private int mDragDistance = -1;
private ViewGroup.MarginLayoutParams mParams;
private ViewGroup.MarginLayoutParams mOriginParams;
private int viewOriginMargin = -1000;
private float mStartY = 0;
private float mStartX = 0;
private boolean isTouched = false;
public DragTouchListener(int dragDirection, int dragDistance){
mDragDirection = dragDirection;
mDragDistance = dragDistance;
}
protected void onClick(View view){
}
protected void onDragComplete(View view){
}
protected void onDragRebound(View view){
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (viewOriginMargin == -1000){
mParams = (ViewGroup.MarginLayoutParams)view.getLayoutParams();
if (mDragDirection == DIRECTION_UP) {
viewOriginMargin = mParams.bottomMargin;
}else if (mDragDirection == DIRECTION_DOWN){
viewOriginMargin = mParams.topMargin;
}else if (mDragDirection == DIRECTION_LEFT){
viewOriginMargin = mParams.rightMargin;
}else if (mDragDirection == DIRECTION_RIGHT){
viewOriginMargin = mParams.leftMargin;
}
}
int action = motionEvent.getAction();
switch (action){
case MotionEvent.ACTION_DOWN:
isTouched = true;
mStartY = motionEvent.getY();
mStartX = motionEvent.getX();
return true;
case MotionEvent.ACTION_MOVE:
float y = motionEvent.getY();
float x = motionEvent.getX();
if (mDragDirection == DIRECTION_UP){
if(y < mStartY){
mParams.bottomMargin = viewOriginMargin +(int) (mStartY - y);
}
}else if (mDragDirection == DIRECTION_DOWN){
if (y > mStartY){
mParams.topMargin = viewOriginMargin + (int) (y - mStartY);
}
}else if (mDragDirection == DIRECTION_LEFT){
if (x < mStartX){
mParams.rightMargin = viewOriginMargin + (int) (mStartX - x);
}
}else if (mDragDirection == DIRECTION_RIGHT){
if (x > mStartX){
mParams.leftMargin = viewOriginMargin + (int) (x - mStartX);
}
}
view.setLayoutParams(mParams);
break;
case MotionEvent.ACTION_UP:
float nowY = motionEvent.getY();
float nowX = motionEvent.getX();
int deltaX = (int)nowX - (int)mStartX;
int deltaY = (int)nowY - (int)mStartY;
if (isTouched && Math.abs(deltaX) < 5 && Math.abs(deltaY) < 5){
onClick(view);
break;
}
if (mDragDirection == DIRECTION_UP){
if (isTouched && mStartY - nowY > mDragDistance){
// Log.i("test-drag", "direction up , startY = " + mStartY + ", nowY = " + nowY +
// ", startY - nowY = " + (mStartY - nowY) + ", dragDistance : " + mDragDistance);
onDragComplete(view);
}else if (mStartY - nowY > 0 && mStartY - nowY < mDragDistance ){
mParams.bottomMargin = viewOriginMargin;
view.setLayoutParams(mParams);
onDragRebound(view);
}
}else if (mDragDirection == DIRECTION_DOWN){
if (isTouched && nowY - mStartY > mDragDistance){
onDragComplete(view);
}else if ( nowY - mStartY > 0 && nowY - mStartY < mDragDistance ){
mParams.topMargin = viewOriginMargin;
view.setLayoutParams(mParams);
onDragRebound(view);
}
}else if (mDragDirection == DIRECTION_LEFT){
if (isTouched && mStartX - nowX > mDragDistance){
onDragComplete(view);
}else if ( mStartX - nowX > 0 && mStartX - nowX < mDragDistance ){
mParams.rightMargin = viewOriginMargin;
view.setLayoutParams(mParams);
onDragRebound(view);
}
}else if (mDragDirection == DIRECTION_RIGHT){
if (isTouched && nowX - mStartX > mDragDistance){
onDragComplete(view);
}else if ( nowX - mStartX > 0 && nowX - mStartX < mDragDistance ){
mParams.leftMargin = viewOriginMargin;
view.setLayoutParams(mParams);
onDragRebound(view);
}
}
isTouched = false;
break;
}
return false;
}
}
在使用時繼承該類， 并覆蓋三個回調方法， 就可以在合適的時機得到回調。
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