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Android ConstraintLayout 布局约束
实践过程
代码修改约束
public class ActivityJavaConstraintLayout extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_java_constraint);
ConstraintLayout idConstraintLayout = findViewById(R.id.idConstraintLayout);
findViewById(R.id.idBtn).setOnClickListener(v -> {
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(idConstraintLayout);
//设置相对父布局剧中
constraintSet.centerHorizontally(R.id.idTxt, ConstraintSet.PARENT_ID);
constraintSet.centerVertically(R.id.idTxt, ConstraintSet.PARENT_ID);
//可以添加动画
TransitionManager.beginDelayedTransition(idConstraintLayout);
constraintSet.applyTo(idConstraintLayout);
});
//还有其他形式 控件A底部和空间B顶部对其 等同于xml中属性 app:layout_constraintBottom_toTopOf
// constraintSet.connect(R.id.idTxtA, ConstraintSet.BOTTOM, R.id.idTxtB, ConstraintSet.TOP);
}
}
除了上面的效果，我们还能实现切换布局的时候，相同控件动画化。我们准备两个布局，布局内id一致，但是位置不同。
布局A如下：
布局B如下：
public class ActivityJavaConstraintLayout extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_java_constraint);
ConstraintLayout idConstraintLayout = findViewById(R.id.idConstraintLayout);
//变化
findViewById(R.id.idBtn).setOnClickListener(v ->{
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(this,R.layout.activity_java_constraint_b);
TransitionManager.beginDelayedTransition(idConstraintLayout);
constraintSet.applyTo(idConstraintLayout);
});
//恢复
findViewById(R.id.idBtnBack).setOnClickListener(v->{
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(this,R.layout.activity_java_constraint);
TransitionManager.beginDelayedTransition(idConstraintLayout);
constraintSet.applyTo(idConstraintLayout);
});
}
}
