[移动开发]利用RecyclerView做成搜索框的效果

目录

自定义一个继承RecyclerView的类

???????????????????运用到数据库（GreenDao）

以及用到适配器的MyAdapter类

最后的Activity类

文中用到的 APP类

单例的 数据库的Manager

用来传给适配器的item.xml

activity.xml

?

运用到数据库（GreenDao）

? ? ? ? 先创建一个这样的prosen类

@Entity
public class Search {

    @Id(autoincrement = true)
    private Long id;

    private String name;


}

自定义一个继承RecyclerView的类

public class MyRecycle extends RecyclerView {

    private boolean isFull = false;
    public MyRecycle(@NonNull Context context) {
        super(context);
    }

    public MyRecycle(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }


    @Override //100
    protected void onMeasure(int widthSpec, int heightSpec) {
        super.onMeasure(widthSpec, heightSpec);

//        int mode = MeasureSpec.getMode(100);
//        int size = MeasureSpec.getSize(100);
//        MeasureSpec.EXACTLY;//
//        MeasureSpec.AT_MOST;//

        //默认高,展开高
        if(isFull){
            int i = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
            super.onMeasure(widthSpec, i);
        }else{
            setMeasuredDimension(widthSpec,400);
        }

    }

    public boolean isFull() {
        return isFull;
    }

    public void setFull(boolean full) {
        isFull = full;
        requestLayout();
    }
}

以及用到适配器的MyAdapter类

public class MyAdapter extends BaseQuickAdapter<Search, BaseViewHolder> {

    @Override
    protected void convert(BaseViewHolder helper, Search item) {
        TextView name = helper.getView(R.id.name);
        name.setText(item.getName());
        helper.addOnClickListener(R.id.del_img);
    }

    public MyAdapter(int layoutResId, @Nullable List<Search> data) {
        super(layoutResId, data);
    }
}

最后的Activity类

public class MainActivity extends AppCompatActivity {
    private ScrollView scrollView;
    private LinearLayout ll;
    private EditText edit;
    private ImageView search;
    private MyRecycle myRecycle;
    private TextView showAll;
    private  List<Search> list;
    private MyAdapter myAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        scrollView = (ScrollView) findViewById(R.id.scrollView);
        ll = (LinearLayout) findViewById(R.id.ll);
        edit = (EditText) findViewById(R.id.edit);
        search = (ImageView) findViewById(R.id.search);
        myRecycle = (MyRecycle) findViewById(R.id.myRecycle);
        showAll = (TextView) findViewById(R.id.showAll);


        list = new ArrayList<>();

//        Search search = new Search();
//        search.setName("哈哈哈");
//
//        list.add(search);
//        list.add(search);
//        list.add(search);
//        list.add(search);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this){
            @Override
            public boolean canScrollVertically() {
                return false;
            }
        };

        myRecycle.setLayoutManager(linearLayoutManager);

        //从数据库先查询一次
        SearchDao searchDao = DaoManager.getInstance().getDaoSession().getSearchDao();
        List<Search> list1 = searchDao.queryBuilder().orderDesc(SearchDao.Properties.Id).limit(10).build().list();
        list.addAll(list1);
        myAdapter = new MyAdapter(R.layout.rv_layout, list);
        myRecycle.setAdapter(myAdapter);


        myAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {
            @Override
            public void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {
                Search item = myAdapter.getItem(position);

                //1
                list.remove(item);

                //2
                DaoManager.getInstance().getDaoSession().getSearchDao().delete(item);

                //3
                myAdapter.notifyDataSetChanged();
            }
        });

    }

    public void add(View view) {

        String string = edit.getText().toString();
        Search search = new Search();
        search.setName(string);
//        search.setId(1l);


        //1,到集合
//        list.add(search);
        //排序
//        Collections.sort(list, new Comparator<Search>() {
//            @Override
//            public int compare(Search o1, Search o2) { // 0 >0 <0
//                return (int) (o2.getId() - o1.getId());
//            }
//        });




        list.clear();

        //2,到数据库
        SearchDao searchDao = DaoManager.getInstance().getDaoSession().getSearchDao();
        searchDao.insert(search);
        List<Search> list1 = searchDao.queryBuilder().orderDesc(SearchDao.Properties.Id).limit(10).build().list();

        list.addAll(list1);

        //适配器刷新一下
        myAdapter.notifyDataSetChanged();

    }

    public void show(View view) {
        if(myRecycle.isFull()){
            //
            showAll.setText("展开所有");
            myRecycle.setFull(false);

            new AlertDialog.Builder(this).setTitle("删除").setMessage("确定吗?")
                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    })
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                            DaoManager.getInstance().getDaoSession().getSearchDao().deleteAll();

                            list.clear();
                            myAdapter.notifyDataSetChanged();
                        }
                    }).show();

        }else{
            showAll.setText("删除所有");
            myRecycle.setFull(true);
        }
    }
}

文中用到的 APP类

public class App extends Application {
    public static Context context;
    @Override
    public void onCreate() {
        super.onCreate();
        context = this;
    }
}

单例的 数据库的Manager

public class DaoManager {

    private DaoSession daoSession;
    private static DaoManager daoManger;
    private DaoManager(){
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(App.context, "search.db");
        SQLiteDatabase writableDatabase = devOpenHelper.getWritableDatabase();//
        DaoMaster daoMaster = new DaoMaster(writableDatabase);
        daoSession = daoMaster.newSession();
    }
    public static DaoManager getInstance(){
        if(daoManger == null){
            synchronized (DaoManager.class){
                if(daoManger == null){
                    daoManger = new DaoManager();
                }
            }
        }
        return daoManger;
    }

    public DaoSession getDaoSession() {
        return daoSession;
    }
}

用来传给适配器的item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/name"
        android:text="123"
        ></TextView>
    <ImageView
        android:layout_alignParentRight="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"
        android:layout_marginRight="@dimen/dp_72"
        android:id="@+id/del_img"></ImageView>
</RelativeLayout>

activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:layout_height="match_parent"
            android:id="@+id/ll">

            <LinearLayout
                android:layout_width="match_parent"
                android:orientation="horizontal"
                android:layout_height="56dp">

                <EditText
                    android:layout_width="0dp"
                    android:layout_weight="5"
                    android:layout_height="wrap_content"
                    android:id="@+id/edit"></EditText>
                <ImageView
                    android:layout_width="0dp"
                    android:layout_weight="1"
                    android:onClick="add"
                    android:layout_height="wrap_content"
                    android:src="@mipmap/ic_launcher"
                    android:id="@+id/search"></ImageView>

            </LinearLayout>

            <com.fenghongzhang.day014.MyRecycle
                android:layout_width="match_parent"
                android:id="@+id/myRecycle"
                android:layout_height="wrap_content">

            </com.fenghongzhang.day014.MyRecycle>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="展示所有"
                android:id="@+id/showAll"
                android:onClick="show"
                ></TextView>

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView><ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"></ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:src="@mipmap/ic_launcher"/>


        </LinearLayout>

    </ScrollView>

</LinearLayout>