| package com.example.android.constraintapi; |
| |
| //BEGIN_INCLUDE(Example) |
| import android.content.Context; |
| import android.os.Bundle; |
| import android.support.constraint.ConstraintLayout; |
| import android.support.constraint.ConstraintSet; |
| import android.support.transition.TransitionManager; |
| import android.support.v7.app.AppCompatActivity; |
| import android.view.View; |
| |
| public class MainActivity extends AppCompatActivity { |
| ConstraintSet mConstraintSet1 = new ConstraintSet(); // create a Constraint Set |
| ConstraintSet mConstraintSet2 = new ConstraintSet(); // create a Constraint Set |
| ConstraintLayout mConstraintLayout; // cache the ConstraintLayout |
| boolean mOld = true; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| Context context = this; |
| mConstraintSet2.clone(context, R.layout.state2); // get constraints from layout |
| setContentView(R.layout.state1); |
| mConstraintLayout = (ConstraintLayout) findViewById(R.id.activity_main); |
| mConstraintSet1.clone(mConstraintLayout); // get constraints from ConstraintSet |
| } |
| |
| public void foo(View view) { |
| TransitionManager.beginDelayedTransition(mConstraintLayout); |
| if (mOld = !mOld) { |
| mConstraintSet1.applyTo(mConstraintLayout); // set new constraints |
| } else { |
| mConstraintSet2.applyTo(mConstraintLayout); // set new constraints |
| } |
| } |
| } |
| //END_INCLUDE(Example) |