CoordinatorLayout + AppBarLayout 的簡單使用及解決滑動抖動問題

第一步： 導入相應的design包

dependencies {
   ......
    implementation 'com.android.support:design:27.1.0'
}

第二步：布局文件

<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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="#EFF3F7"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="200dp"
            app:layout_behavior="com.sun.testpopu.FixAppBarLayout"
            app:elevation="0dp">

            <View
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:background="#000000"
                app:layout_scrollFlags="scroll|enterAlwaysCollapsed"/>
        </android.support.design.widget.AppBarLayout>
        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="1000dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
    </android.support.design.widget.CoordinatorLayout>
</LinearLayout>

第二步：初始化 Recyclerview

/**
 * @author Sigal
 * on 2018/10/28
 * note:
 */
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ArrayList<String> mDataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        initRecycView();
    }

    private void initRecycView() {
        recyclerView = findViewById(R.id.recyclerview);
        recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this,
                LinearLayoutManager.VERTICAL, false));
        recyclerView.setAdapter(new TextviewAdapter());

    }

    private void initData() {
        mDataList = new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            mDataList.add("測試數據" + i);
        }
    }

    public class TextviewAdapter extends RecyclerView.Adapter<TextviewAdapter.ViewHolder>{

        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycleview_item, parent, false);
            return new ViewHolder(view);
        }

        @Override
        public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
            holder.mText.setText(mDataList.get(position));
        }

        @Override
        public int getItemCount() {
            return mDataList.size();
        }

        class ViewHolder extends RecyclerView.ViewHolder{
            private final TextView mText;

            public ViewHolder(View itemView) {
                super(itemView);
                mText = itemView.findViewById(R.id.textview);
            }
        }
    }
}

 

第三步：解決滑動抖動問題

/**
 * @author Sigal
 * on 2018/11/26
 * note: 解決AppBarLayout滑動時抖動問題
 */
public class FixAppBarLayout extends AppBarLayout.Behavior {
    private static final String TAG = "AppBarLayoutBehavior";

    public FixAppBarLayout() {
        super();
    }

    public FixAppBarLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
        if (ev.getAction() == ACTION_DOWN) {
            Object scroller = getSuperSuperField(this, "mScroller");
            if (scroller != null && scroller instanceof OverScroller) {
                OverScroller overScroller = (OverScroller) scroller;
                overScroller.abortAnimation();
            }
        }

        return super.onInterceptTouchEvent(parent, child, ev);
    }

    private Object getSuperSuperField(Object paramClass, String paramString) {
        Field field = null;
        Object object = null;
        try {
            field = paramClass.getClass().getSuperclass().getSuperclass().getDeclaredField(paramString);
            field.setAccessible(true);
            object = field.get(paramClass);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return object;
    }
}

注：在布局文件中引用：app:layout_behavior="com.sun.testpopu.FixAppBarLayout"