##上圖

ConstraintUtil.java

import android.support.annotation.IdRes;

import android.support.constraint.ConstraintLayout;

import android.support.constraint.ConstraintSet;

import android.transition.TransitionManager;

/**

* Created by xiaolei on 2017/9/8.

*/

public class ConstraintUtil

{

private ConstraintLayout constraintLayout;

private ConstraintBegin begin;

private ConstraintSet applyConstraintSet = new ConstraintSet();

private ConstraintSet resetConstraintSet = new ConstraintSet();

public ConstraintUtil(ConstraintLayout constraintLayout)

{

this.constraintLayout = constraintLayout;

resetConstraintSet.clone(constraintLayout);

}

/**

* 開始修改

* @return

*/

public ConstraintBegin begin()

{

synchronized (ConstraintBegin.class)

{

if (begin == null)

{

begin = new ConstraintBegin();

}

}

applyConstraintSet.clone(constraintLayout);

return begin;

}

/**

* 帶動畫的修改

* @return

*/

public ConstraintBegin beginWithAnim()

{

TransitionManager.beginDelayedTransition(constraintLayout);

return begin();

}

/**

* 重置

*/

public void reSet()

{

resetConstraintSet.applyTo(constraintLayout);

}

/**

* 帶動畫的重置

*/

public void reSetWidthAnim()

{

TransitionManager.beginDelayedTransition(constraintLayout);

resetConstraintSet.applyTo(constraintLayout);

}

public class ConstraintBegin

{

/**

* 清除關系

* 注意：這里不僅僅會清除關系，還會清除對應控件的寬高為 w:0,h:0

* @param viewIds

* @return

*/

public ConstraintBegin clear(@IdRes int... viewIds)

{

for (int viewId : viewIds)

{

applyConstraintSet.clear(viewId);

}

return this;

}

/**

* 清除某個控件的，某個關系

* @param viewId

* @param anchor

* @return

*/

public ConstraintBegin clear(int viewId,int anchor)

{

applyConstraintSet.clear(viewId,anchor);

return this;

}

/**

* 為某個控件設置 margin

* @param viewId 某個控件ID

* @param left marginLeft

* @param top marginTop

* @param right marginRight

* @param bottom marginBottom

* @return

*/

public ConstraintBegin setMargin(@IdRes int viewId, int left, int top, int right, int bottom)

{

setMarginLeft(viewId,left);

setMarginTop(viewId,top);

setMarginRight(viewId,right);

setMarginBottom(viewId,bottom);

return this;

}

/**

* 為某個控件設置 marginLeft

* @param viewId 某個控件ID

* @param left marginLeft

* @return

*/

public ConstraintBegin setMarginLeft(@IdRes int viewId, int left)

{

applyConstraintSet.setMargin(viewId, ConstraintSet.LEFT, left);

return this;

}

/**

* 為某個控件設置 marginRight

* @param viewId 某個控件ID

* @param right marginRight

* @return

*/

public ConstraintBegin setMarginRight(@IdRes int viewId, int right)

{

applyConstraintSet.setMargin(viewId, ConstraintSet.RIGHT, right);

return this;

}

/**

* 為某個控件設置 marginTop

* @param viewId 某個控件ID

* @param top marginTop

* @return

*/

public ConstraintBegin setMarginTop(@IdRes int viewId, int top)

{

applyConstraintSet.setMargin(viewId, ConstraintSet.TOP, top);

return this;

}

/**

* 為某個控件設置marginBottom

* @param viewId 某個控件ID

* @param bottom marginBottom

* @return

*/

public ConstraintBegin setMarginBottom(@IdRes int viewId, int bottom)

{

applyConstraintSet.setMargin(viewId, ConstraintSet.BOTTOM, bottom);

return this;

}

/**

* 為某個控件設置關聯關系 left_to_left_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Left_toLeftOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.LEFT, endId, ConstraintSet.LEFT);

return this;

}

/**

* 為某個控件設置關聯關系 left_to_right_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Left_toRightOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.LEFT, endId, ConstraintSet.RIGHT);

return this;

}

/**

* 為某個控件設置關聯關系 top_to_top_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Top_toTopOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.TOP, endId, ConstraintSet.TOP);

return this;

}

/**

* 為某個控件設置關聯關系 top_to_bottom_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Top_toBottomOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.TOP, endId, ConstraintSet.BOTTOM);

return this;

}

/**

* 為某個控件設置關聯關系 right_to_left_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Right_toLeftOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.RIGHT, endId, ConstraintSet.LEFT);

return this;

}

/**

* 為某個控件設置關聯關系 right_to_right_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Right_toRightOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.RIGHT, endId, ConstraintSet.RIGHT);

return this;

}

/**

* 為某個控件設置關聯關系 bottom_to_bottom_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Bottom_toBottomOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.BOTTOM, endId, ConstraintSet.BOTTOM);

return this;

}

/**

* 為某個控件設置關聯關系 bottom_to_top_of

* @param startId

* @param endId

* @return

*/

public ConstraintBegin Bottom_toTopOf(@IdRes int startId, @IdRes int endId)

{

applyConstraintSet.connect(startId, ConstraintSet.BOTTOM, endId, ConstraintSet.TOP);

return this;

}

/**

* 為某個控件設置寬度

* @param viewId

* @param width

* @return

*/

public ConstraintBegin setWidth(@IdRes int viewId, int width)

{

applyConstraintSet.constrainWidth(viewId, width);

return this;

}

/**

* 某個控件設置高度

* @param viewId

* @param height

* @return

*/

public ConstraintBegin setHeight(@IdRes int viewId, int height)

{

applyConstraintSet.constrainHeight(viewId, height);

return this;

}

/**

* 提交應用生效

*/

public void commit()

{

applyConstraintSet.applyTo(constraintLayout);

}

}

}

使用

public void onApplyClick(View view)

{

constraintUtil = new ConstraintUtil(constraintLayout);

ConstraintUtil.ConstraintBegin begin = constraintUtil.beginWithAnim();

begin.clear(R.id.button1,R.id.button2,R.id.button3);

begin.Left_toLeftOf(R.id.button1,R.id.main);

begin.Left_toRightOf(R.id.button2,R.id.button1);

begin.Right_toLeftOf(R.id.button2,R.id.button3);

begin.Right_toRightOf(R.id.button3,R.id.main);

begin.setWidth(R.id.button1, ConstraintSet.WRAP_CONTENT);

begin.setWidth(R.id.button2, ConstraintSet.WRAP_CONTENT);

begin.setWidth(R.id.button3, ConstraintSet.WRAP_CONTENT);

begin.setHeight(R.id.button1, ConstraintSet.WRAP_CONTENT);

begin.setHeight(R.id.button2, ConstraintSet.WRAP_CONTENT);

begin.setHeight(R.id.button3, ConstraintSet.WRAP_CONTENT);

begin.commit();

}

總結

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