安卓給佈局中添加：android:animateLayoutChanges="true"，就可以讓佈局中的控件顯示與隱藏有一個動畫效果
public class MainActivity extends Activity {
private LinearLayout rootView;private OnClickListener btn_onclicklistener=new OnClickListener() {
@Override
public void onClick(View arg0) {
rootView.removeView(arg0);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
rootView = (LinearLayout) findViewById(R.id.rootView);
}
private void addButton(){
Button btn = new Button(this);
btn.setText("Remove me");
rootView.addView(btn);
//rootView.setLayoutTransition(transition);
btn.setOnClickListener(btn_onclicklistener);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch (item.getItemId()) {
case R.id.action_settings:
return true;
case R.id.action_add:
addButton();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
}
佈局文件代碼：
<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.jikexueyuan.l02layoutchangeanim.MainActivity$PlaceholderFragment" >
</LinearLayout>
菜單佈局文件代碼：
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.jikexueyuan.l02layoutchangeanim.MainActivity" >
<item
android:id="@+id/action_settings"
android:orderInCategory="100"
android:showAsAction="never"
android:title="@string/action_settings"/>
<item
android:id="@+id/action_add"
android:showAsAction="always"
android:icon="@android:drawable/ic_input_add"/>
</menu>