1、Include

將 其他的xml文件包含的當(dāng)前xml文件中來(lái)

common_nav.xml

activity_main.xml

2、merge

目的是通過(guò)刪減多余或者額外的層級(jí)，從而優(yōu)化整個(gè)Android Layout的結(jié)構(gòu)。核心功能就是減少冗余的層次從而達(dá)到優(yōu)化UI的目的！—轉(zhuǎn)載

3、ViewStub

延時(shí)加載view

package?com.example.administrator.layoutoptimize;

import?android.support.v7.app.ActionBarActivity;
import?android.os.Bundle;
import?android.view.Menu;
import?android.view.MenuItem;
import?android.view.View;
import?android.view.ViewStub;
import?android.widget.Button;


public?class?MainActivity?extends?ActionBarActivity?{
????private?boolean?inflated?=?false;
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);

????????Button?btn?=?(Button)findViewById(R.id.btn);
????????btn.setOnClickListener(new?View.OnClickListener()?{
????????????@Override
????????????public?void?onClick(View?v)?{
????????????????ViewStub?viewStub?=?(ViewStub)findViewById(R.id.viewStub);
????????????????if(!inflated){
????????????????????inflated?=?true;
????????????????????viewStub.inflate();
????????????????}
????????????}
????????});
????}
}