Android TV 开发（4）
本文来自网易云社区
作者：孙有军
最后我们再来看看好友界面，改界面本地是没有xml的，因此我们直接来看看代码：
这里将使用到数据bean，与数据源的代码也贴出来如下：
public class Contact implements Parcelable {
private String phone;
private int headResId;
private String name;
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public int getHeadResId() {
return headResId;
}
public void setHeadResId(int headResId) {
this.headResId = headResId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Contact() {
}
public Contact(Parcel in) {
phone = in.readString();
headResId = in.readInt();
name = in.readString();
}
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(phone);
dest.writeInt(headResId);
dest.writeString(name);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(200);
sb.append("Contact{");
sb.append("phone='" + phone + '\'');
sb.append(", headResId='" + headResId + '\'');
sb.append(", name='" + name + '\'');
sb.append('}');
return sb.toString();
}
public static final Creator CREATOR = new Creator() {
public Contact createFromParcel(Parcel in) {
return new Contact(in);
}
public Contact[] newArray(int size) {
return new Contact[size];
}
};
}
//////
public class ContactProvider {
private static List<Contact> contactList;
private static Context sContext;
private static int[] head = {R.drawable.avater1, R.drawable.avater2, R.drawable.avater3, R.drawable.avater4, R
.drawable.avater5, R.drawable.avater6, R.drawable.avater7, R.drawable.avater8, R.drawable.avater9, R
.drawable.avater10, R.drawable.avater11, R.drawable.avater12};
private static String[] names = {"梦洁", "雅静", "韵寒", "莉姿", "沛玲", "欣妍", "歆瑶", "凌菲", "靖瑶", "瑾萱", "芳蕤", "若华"};
private static String[] phones = {"18618188630", "18158103936", "18620145337", "15116333186", "18618188630",
"18158103936", "18620145337", "15116333186", "18618188630", "18158103936", "18620145337", "18767106408"};
public static void setContext(Context context) {
if (sContext == null)
sContext = context;
}
public static List<Contact> getContactList() {
buildContact();
return contactList;
}
public static List<Contact> buildContact() {
if (null != contactList) {
return contactList;
}
contactList = new ArrayList<Contact>();
for (int i = 0; i < 12; ++i) {
contactList.add(buildContactInfo(phones[i], names[i], head[i]));
}
return contactList;
}
private static Contact buildContactInfo(String phone, String name, int resId) {
Contact contact = new Contact();
contact.setPhone(phone);
contact.setName(name);
contact.setHeadResId(resId);
return contact;
}
}/*
* VerticalGridFragment shows a grid of videos
*/
public class VerticalGridFragment extends android.support.v17.leanback.app.VerticalGridFragment {
private static final String TAG = "VerticalGridFragment";
private static final int DEFAULT_COLUMNS = 4;
private int numColumns = DEFAULT_COLUMNS;
private ArrayObjectAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate");
super.onCreate(savedInstanceState);
//setTitle(getString(R.string.vertical_grid_title));
getParams();
setupFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = super.onCreateView(inflater, container, savedInstanceState);
return root;
}
private void setupFragment() {
VerticalGridPresenter gridPresenter = new VerticalGridPresenter(FocusHighlight.ZOOM_FACTOR_NONE);
gridPresenter.setNumberOfColumns(numColumns);
//gridPresenter.setShadowEnabled(false);
setGridPresenter(gridPresenter);
mAdapter = new ArrayObjectAdapter(new ContactPresenter());
List<Contact> contacts = ContactProvider.getContactList();
mAdapter.addAll(0, contacts);
setAdapter(mAdapter);
setOnItemViewClickedListener(new ItemViewClickedListener());
setOnItemViewSelectedListener(new ItemViewSelectedListener());
}
public void getParams() {
if (getArguments() != null) {
numColumns = getArguments().getInt(Extra.COLUMNS);
}
}
private final class ItemViewClickedListener implements OnItemViewClickedListener {
@Override
public void onItemClicked(Presenter.ViewHolder itemViewHolder, Object item, RowPresenter.ViewHolder
rowViewHolder, Row row) {
if (item instanceof Contact) {
Contact contact = (Contact) item;
// TODO
}
}
}
private final class ItemViewSelectedListener implements OnItemViewSelectedListener {
@Override
public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item, RowPresenter.ViewHolder
rowViewHolder, Row row) {
}
}
}在Fragment中我们自己实现了一个ContactPresenter，该Presenter是仿照官方的CardPresenter，但是CardPresenter中使用的ImageCardView是系统support包中提供的控件，而ContactPresenter中使用的是自己自定义的控件， 代码如下：
public class ContactPresenter extends Presenter {
private static final String TAG = "CardPresenter";
private static int sSelectedBackgroundColor;
private static int sDefaultBackgroundColor;
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent) {
Log.d(TAG, "onCreateViewHolder");
sDefaultBackgroundColor = parent.getResources().getColor(R.color.white_35_transparent);
sSelectedBackgroundColor = parent.getResources().getColor(R.color.white_60_transparent);
ContactView contactView = new ContactView(parent.getContext()) {
@Override
public void setSelected(boolean selected) {
updateCardBackgroundColor(this, selected);
super.setSelected(selected);
}
};
contactView.setFocusable(true);
contactView.setFocusableInTouchMode(true);
updateCardBackgroundColor(contactView, false);
return new ViewHolder(contactView);
}
private static void updateCardBackgroundColor(ContactView view, boolean selected) {
int color = selected ? sSelectedBackgroundColor : sDefaultBackgroundColor;
view.setBackgroundColor(color);
//view.findViewById(R.id.info_field).setBackgroundColor(color);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, Object item) {
Contact contact = (Contact) item;
ContactView contactView = (ContactView) viewHolder.view;
Log.d(TAG, "onBindViewHolder");
contactView.setHead(contact.getHeadResId());
contactView.setName(contact.getName());
contactView.setPhone(contact.getPhone());
}
@Override
public void onUnbindViewHolder(ViewHolder viewHolder) {
Log.d(TAG, "onUnbindViewHolder");
ContactView contactView = (ContactView) viewHolder.view;
// Remove references to images so that the garbage collector can free up memory
contactView.setHead(0);
}
}ContactView是一个继承自LinearLayout的自定义控件，包含了一个ImageView和两个TextView。
到此整个界面的代码就完成了，接下来我们来看看遇到的问题。
问题列表
问题1：控件遥控器不能选中，不能导航
出现这种问题往往是控件没有设置android:focusable="true"属性，只有默认能够选中焦点的才不需要设置改属性，比如Button，EditText。
问题2：控件选中后，看不出选中效果
由于默认选中是没有视觉效果的，因此你需要对控件设置选中效果，比如说背景图片，以前在手机上可能只需要设置selector中的pressed属性，或者selected属性，现在针对TV你必须要设置focused属性，比如拨号键盘选中后会出现一个圆形的选中背景框,
要实现上述效果，因此对每一键盘输入按钮添加如下的selector。
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/key_board_hover" android:state_focused="true"></item> <item android:drawable="@drawable/key_board_hover" android:state_pressed="true"></item> <item android:drawable="@drawable/key_board_hover" android:state_checked="true"></item> <item android:drawable="@color/transparent"></item> </selector> key_board_hover.xml <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <solid android:color="@color/white_35_transparent"></solid> <size android:width="40dp" android:height="40dp"/> </shape>
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