首页 > 代码库 > 关于机顶盒焦点的获取,及事件响应!!
关于机顶盒焦点的获取,及事件响应!!
记得刚做机顶盒开发的时候</span>,真的把我坑惨了,网上又找都不什么资料,所以只能自己慢慢摸索了。在其中也是学到了一些知识,当然也遇到过许多的问题,so。。。就希望把这些经验分享给其他刚开始步入机顶盒开发的程序猿。。。。。</span>
做机顶盒这块了,最麻烦的就是这个焦点问题了,因为机顶盒都是用遥控操作的,所以在界面上都需要有一个用户操作的焦点!!!下面就带大家写一个在机顶盒中经常用到的界面切换的程序。。。
程序有四个界面,按遥控的左右键,能切换到不同界面,下面是布局。(注:布局最好是新建一个layout-land文件夹存放)
activity_main:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/launch_bg" android:layout_width="match_parent" android:layout_height="match_parent" > <RadioGroup android:id="@+id/title_group" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="60dip" android:orientation="horizontal" android:paddingLeft="120dip" android:paddingRight="60dip" > <RadioButton android:id="@+id/l1" style="@style/TitleButton" android:layout_width="180dip" android:layout_height="wrap_content" android:button="@null" android:focusable="true" android:focusableInTouchMode="true" android:gravity="center" android:nextFocusLeft="@+id/tv_show" android:text="第一" /> <RadioButton android:id="@+id/l2" style="@style/TitleButton" android:layout_width="180dip" android:layout_height="wrap_content" android:button="@null" android:focusable="true" android:focusableInTouchMode="true" android:gravity="center" android:text="第二" /> <RadioButton android:id="@+id/l3" style="@style/TitleButton" android:layout_width="180dip" android:layout_height="wrap_content" android:button="@null" android:focusable="true" android:focusableInTouchMode="true" android:gravity="center" android:text="第三" /> <RadioButton android:id="@+id/l4" style="@style/TitleButton" android:layout_width="180dip" android:layout_height="wrap_content" android:button="@null" android:focusable="true" android:focusableInTouchMode="true" android:gravity="center" android:nextFocusRight="@+id/settings" android:text="第四" /> </RadioGroup> <android.support.v4.view.ViewPager android:id="@+id/main_layout_pager" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center_horizontal" android:layout_marginTop="100dp" /> </RelativeLayout>
RadioGroup的样式:定义了选中和未选中radiogroup的背景及颜色的改变。
<style name="TitleButton"> <item name="android:background">@drawable/title_button_selector</item> <item name="android:textColor">@drawable/title_textcolor_selector</item> <item name="android:textSize">25sp</item> </style>
layout1:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="这是第一个界面" /> </LinearLayout>其他的三个布局文件都差不多,就不一一列举了。。。
接下来看 view1的编写:
import android.content.Context; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.widget.LinearLayout; public class View1 extends LinearLayout { private Context mContext; public View1(Context context) { super(context); mContext = context; } public void initView() { setLayoutParams(new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); setGravity(Gravity.CENTER_HORIZONTAL); View root = LayoutInflater.from(mContext).inflate(R.layout.layout1, null); addView(root); } }这里我继承了LinerrLayout,是为了能在mainactivity把我的view填充进去,其他的都比较简单了,后面的几个view也是这样,只不过就是布局不一样而已。
然后是我们的MainActivity:
import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.view.View.OnFocusChangeListener; import android.widget.RadioButton; import android.widget.RadioGroup; public class MainActivity extends Activity { private View1 v1; private View2 v2; private View3 v3; private View4 v4; private ArrayList<View> pages = new ArrayList<View>(); private ViewPager centerPager; private RadioGroup titleGroup;// 标签组 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); v1 = new View1(this); v2 = new View2(this); v3 = new View3(this); v4 = new View4(this); pages.add(v1); pages.add(v2); pages.add(v3); pages.add(v4); // 添加页面 initView(); initListener(); } private void initView() { titleGroup = (RadioGroup) findViewById(R.id.title_group); titleGroup.check(R.id.l1); centerPager = (ViewPager) findViewById(R.id.main_layout_pager); centerPager.setAdapter(new AllPagesAdapter(pages)); // 当前显示第一页 centerPager.setCurrentItem(0); v1.initView();//加载页面 v2.initView(); v3.initView(); v4.initView(); } <span style="white-space:pre"> </span>//对radiogroup的焦点监听,进行页面的切换 public void initListener() { OnFocusChangeListener focusListener = new OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if (hasFocus) { int position = (Integer) v.getTag(); centerPager.setCurrentItem(position, true); } } }; for (int i = 0; i < titleGroup.getChildCount(); i++) { View view = titleGroup.getChildAt(i); view.setTag(i); view.setOnFocusChangeListener(focusListener); } centerPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { if (arg0 < titleGroup.getChildCount()) { ((RadioButton) titleGroup.getChildAt(arg0)) .setChecked(true); } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { } }); } }适配器代码:
import java.util.ArrayList; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.view.View; import android.view.ViewGroup; public class AllPagesAdapter extends PagerAdapter { private ArrayList<View> views; public AllPagesAdapter(ArrayList<View> views) { super(); this.views = views; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public void setPrimaryItem(ViewGroup container, int position, Object object) { } @Override public Object instantiateItem(ViewGroup container, int position) { View child = views.get(position); container.addView(child); return child; } @Override public int getCount() { return views.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO Auto-generated method stub return arg0 == arg1; } @Override public Parcelable saveState() { return null; } public void dataChanged(ArrayList<View> views) { this.views = views; notifyDataSetChanged(); } }代码都比较简单,就到这里了,以后还会继续编写一些有关机顶盒的开发的程序。。。。看下效果图:
关于机顶盒焦点的获取,及事件响应!!
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