Android实现顶部悬浮效果

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 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 ARouter.getInstance().inject(this);
 setContentView(R.layout.activity_new_personal_card);
 ButterKnife.bind(this);
 setSupportActionBar(toolBar);
 getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 getSupportActionBar().setDisplayShowTitleEnabled(false);
 toolBar.setNavigationOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 onBackPressed();
 }
 });
 initData();
 }

　　private void initRefresh() {
 appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
 @Override
 public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
 if (verticalOffset >= 0) {
  swipeRefreshLayout.setEnabled(true);
 } else {
  swipeRefreshLayout.setEnabled(false);
 }
 }
 });
 swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
 @Override
 public void onRefresh() {
 initData();
 swipeRefreshLayout.setRefreshing(false);
 }
 });
 }

android:theme="@style/personalCard"

compileSdkVersion 24
//------------------ 在线依赖开始 ----------------
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:recyclerview-v7:24.2.0'
compile 'com.android.support:cardview-v7:24.2.0'
compile 'com.android.support:design:24.2.0'