动画 --- 添加 和 移除 按钮

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

    private LinearLayout rootView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        rootView = (LinearLayout) findViewById(R.id.rootView);
    }

    // 添加按钮
    private void addButton() {
        Button btn = new Button(this);
        btn.setText("Remove me");
        rootView.addView(btn);
        // rootView.setLayoutTransition(transition);
        btn.setOnClickListener(btn_onclicklistener);
    }

    // 删除按钮
    private OnClickListener btn_onclicklistener = new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            rootView.removeView(arg0);
        }
    };

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.action_add:  
            addButton();
            break;
        }
        return super.onOptionsItemSelected(item);
    }

}

 

R.layout.fragment_main

<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"
    android:id="@+id/rootView"
    android:animateLayoutChanges="true"
    tools:context="com.l02layoutchangeanim.MainActivity$PlaceholderFragment" >
</LinearLayout>

R.menu.main

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.l02layoutchangeanim.MainActivity" >
    <item
        android:id="@+id/action_add"
        android:showAsAction="always"
        android:icon="@android:drawable/ic_input_add"/>
</menu>