小編這次要給大家分享的是Android中如何實(shí)現(xiàn)自定義LineLayout實(shí)現(xiàn)滿屏任意拖動功能，文章內(nèi)容豐富，感興趣的小伙伴可以來了解一下，希望大家閱讀完這篇文章之后能夠有所收獲。
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1.前言
在開發(fā)中，會有需求實(shí)現(xiàn)控件在屏幕隨意拖動，這就需要自定義View,然后在OnTouchEvent事件中，處理MotionEvent.ACTION_MOVE事件，然后通過坐標(biāo)點(diǎn)傳值給onlayout方法,來實(shí)現(xiàn)控件的任意拖動，具體代碼如下：
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import android.content.Context;
import android.util.AttributeSet;
import android.view.Display;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.LinearLayout;
public class DragLineLayout extends LinearLayout {
private int mWidth;
private int mHeight;
private int mScreenWidth;
private int mScreenHeight;
private Context mContext;
private onLocationListener mLocationListener;/*listen to the Rect */
//是否拖動
private boolean isDrag = false;
public boolean isDrag() {
return isDrag;
}
public DragView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
mScreenWidth = getScreenWidth(mContext);
mScreenHeight = getScreenHeight(mContext) - getStatusBarHeight();
}
public int getStatusBarHeight() {
int resourceId = mContext.getResources().getIdentifier("status_bar_height", "dimen", "android");
return mContext.getResources().getDimensionPixelSize(resourceId);
}
public int getScreenWidth(Context context) {
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
return display.getWidth();
}
public int getScreenHeight(Context context) {
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
return display.getHeight();
}
private float mDownX;
private float mDownY;
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
if (this.isEnabled()) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrag = false;
mDownX = event.getX();
mDownY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
final float mXdistance = event.getX() - mDownX;
final float mYdistance = event.getY() - mDownY;
int l, r, t, b;
//當(dāng)水平或者垂直滑動距離大于10,才算是拖動事件
if (Math.abs(mXdistance) > 10 || Math.abs(mYdistance) > 10) {
isDrag = true;
l = (int) (getLeft() + mXdistance);
r = l + mWidth;
t = (int) (getTop() + mYdistance);
b = t + mHeight;
//邊界判斷,不讓布局滑出界面
if (l < 0) {
l = 0;
r = l + mWidth;
} else if (r > mScreenWidth) {
r = mScreenWidth;
l = r - mWidth;
}
if (t < 0) {
t = 0;
b = t + mHeight;
} else if (b > mScreenHeight) {
b = mScreenHeight;
t = b - mHeight;
}
//回調(diào)移動后的坐標(biāo)點(diǎn)
if(mLocationListener!=null){
mLocationListener.locationRect((l+r)/2,(t+b)/2);
}
this.layout(l, t, r, b);
}
break;
case MotionEvent.ACTION_UP:
setPressed(false);
break;
case MotionEvent.ACTION_CANCEL:
setPressed(false);
break;
}
return true;
}
return false;
}
public void setLocationListener(onLocationListener LocationListener) {
this.mLocationListener = LocationListener;
}
public interface onLocationListener {
void locationRect(float locationX, float locationY);
}
}2.在代碼中的運(yùn)用
3.這樣就可以在Activity 加載這個xml 來實(shí)現(xiàn)任意拖動功能
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