自定义添加View

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="添加按钮"/>
    <LinearLayout
        android:id="@+id/linearlayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"></LinearLayout>

</LinearLayout>

animator.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <objectAnimator
        android:valueFrom="0.5"
        android:valueTo="1.0"
        android:duration="1000"
        android:propertyName="scaleX"></objectAnimator>
    <objectAnimator
        android:valueFrom="0.5"
        android:valueTo="1.0"
        android:duration="1000"
        android:propertyName="scaleY"></objectAnimator>

</set>

MainActivity

public class MainActivity extends AppCompatActivity {
    private Button mButton;
    private LinearLayout mLinearLayout;
    private int count;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mLinearLayout= (LinearLayout) findViewById(R.id.linearlayout);
        LayoutTransition transition=new LayoutTransition();
        transition.getDuration(3000);
        transition.setAnimator(LayoutTransition.APPEARING, AnimatorInflater.loadAnimator(getApplicationContext(),R.animator.animator));
        transition.setAnimator(LayoutTransition.CHANGE_APPEARING,transition.getAnimator(LayoutTransition.CHANGE_APPEARING));
        transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,transition.getAnimator(LayoutTransition.CHANGE_DISAPPEARING));
        transition.setAnimator(LayoutTransition.DISAPPEARING,transition.getAnimator(LayoutTransition.DISAPPEARING));
        mLinearLayout.setLayoutTransition(transition);
        mButton= (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                count++;
                Button but=new Button(MainActivity.this);
                ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
                but.setLayoutParams(params);
                but.setText("按钮"+count);
                mLinearLayout.addView(but);
            }
        });
    }
}