Question

我正在使用下面的代码在listview中显示来自手机的联系人，这很正常。

public class ContactList extends ListActivity {
    ListView contactlist;
    Cursor cursor1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact_list);

        cursor1 = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
        startManagingCursor(cursor1);

        String [] from = {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.CommonDataKinds.Phone._ID};
        int [] to = { android.R.id.text1,android.R.id.text2};

        SimpleCursorAdapter listadAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_expandable_list_item_2, cursor1, from, to);
        setListAdapter(listadAdapter);
        contactlist = getListView();
        contactlist.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        contactlist.setItemsCanFocus(false);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.contact_list, menu);
        return true;
    }

    @Override
    public long getSelectedItemId() {
        // TODO Auto-generated method stub
        return super.getSelectedItemId();
    }

    @Override
    public int getSelectedItemPosition() {
        // TODO Auto-generated method stub
        return super.getSelectedItemPosition();
    }

    @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.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

现在我想用recyclerview显示它，直到现在我使用下面的代码将一些字符串添加到我的recyclerview

public class MainActivity extends ActionBarActivity {
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private ArrayList<String> myDataset ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

        // use this setting to improve performance if you know that changes
        // in content do not change the layout size of the RecyclerView
        mRecyclerView.setHasFixedSize(true);

        // use a linear layout manager
        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);

        myDataset = new ArrayList<String>();
        myDataset.add("A");
        myDataset.add("B");
        myDataset.add("C");
        // specify an adapter (see also next example)
        mAdapter = new MyAdapter(myDataset);
        mRecyclerView.setAdapter(mAdapter);
    }...
}

显示如下 enter image description here

任何人都可以指导，推荐和真正的方式来完成这项任务。

日Thnx

Answer 1

编辑1： Fowlow这些步骤： 1.创建活动布局

<RelativeLayout 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"
tools:context="${relativePackage}.${activityClass}" >

<!-- A RecyclerView with some commonly used attributes -->

<android.support.v7.widget.RecyclerView
    android:id="@+id/my_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scrollbars="vertical" />

为每个项目视图创建布局

<ImageView
    android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_alignParentBottom="true"
    android:layout_alignParentTop="true"
    android:layout_marginRight="6dip"
    android:contentDescription="TODO"
    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/secondLine"
    android:layout_width="fill_parent"
    android:layout_height="26dip"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_toRightOf="@id/icon"
    android:ellipsize="marquee"
    android:singleLine="true"
    android:text="Description"
    android:textSize="12sp" />

<TextView
    android:id="@+id/firstLine"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_above="@id/secondLine"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:layout_alignWithParentIfMissing="true"
    android:layout_toRightOf="@id/icon"
    android:gravity="center_vertical"
    android:text="Example application"
    android:textSize="16sp" />

像其他适配器一样创建适配器

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

    private ArrayList<String> mDataset;
    // Provide a reference to the views for each data item   
    // Complex data items may need more than one view per item, and you provide 
    //access to all the views for a data item in a view holder   
    public class ViewHolder extends RecyclerView.ViewHolder {
    // each data item is just a string in this case
    public TextView txtHeader;
    public TextView txtFooter;

    public ViewHolder(View v) {
        super(v);
        txtHeader = (TextView) v.findViewById(R.id.firstLine);
        txtFooter = (TextView) v.findViewById(R.id.secondLine);
    }   

    public void add(int position, String item) {
        mDataset.add(position, item);
        notifyItemInserted(position);   
    }

    public void remove(String item) {
        int position = mDataset.indexOf(item);
        mDataset.remove(position);
        notifyItemRemoved(position);   
    }
    // Provide a suitable constructor (depends on the kind of dataset)  
    public MyAdapter(ArrayList<String> myDataset) {
        mDataset = myDataset;   
    }

    // Create new views (invoked by the layout manager)   
    @Override  
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
        // create a new view
        View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.rowlayout,parent, false);
        // set the view's size, margins, paddings and layout parameters
        ViewHolder vh = new ViewHolder(v);
        return vh;   
    }

    // Replace the contents of a view (invoked by the layout manager)  
    @Override   
    public void onBindViewHolder(ViewHolder holder, int position) {
        // - get element from your dataset at this position
        // - replace the contents of the view with that element
        final String name = mDataset.get(position);
        holder.txtHeader.setText(mDataset.get(position));
        holder.txtHeader.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                    remove(name);
                }
            });

            holder.txtFooter.setText("Footer: " + mDataset.get(position)); 
    }

    // Return the size of your dataset (invoked by the layout manager)  
    @Override   
    public int getItemCount() {
        return mDataset.size();   
    }
}

创建活动以将它们全部链接在一起

公共类MyActivity扩展了Activity { private RecyclerView mRecyclerView; private RecyclerView.Adapter mAdapter; private RecyclerView.LayoutManager mLayoutManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_activity);
    mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

    // use this setting to improve performance if you know that changes
    // in content do not change the layout size of the RecyclerView
    mRecyclerView.setHasFixedSize(true);

    // use a linear layout manager
    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // specify an adapter (see also next example)
    mAdapter = new MyAdapter(myDataset);
    mRecyclerView.setAdapter(mAdapter);
}

}

见this tutorial。那就是你所需要的一切！

使用RecyclerView显示联系人列表

1 个答案: