Android TV焦点框移动

 Tv开发，最重要的当然是焦点框的移动，有了焦点框我们才能知道当前选中的是哪一个，我们来看下效果图：

焦点框移动

那么它如何工作，让我们看一下.

在布局上使用视图. 背景是.9图像作为焦点框. 选择控件后，将视图移动到所选控件的位置. 怎么样，它很容易采取行动. 首先看一下布局

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
   android:background="@color/colorAccent"
   tools:context=".MainActivity">
   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="vertical">
       <FrameLayout
           android:id="@+id/id_fl"
           android:layout_width="880dp"
           android:layout_height="76dp"
           android:layout_marginLeft="208dp"
           android:layout_marginTop="9dp"
           android:focusable="true">
           <TextView
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_gravity="center_vertical"
               android:layout_marginLeft="40dp"
               android:text="第一行"
               android:textSize="28sp" />
       </FrameLayout>
       <FrameLayout
           android:id="@+id/id_fl_2"
           android:layout_width="880dp"
           android:layout_height="76dp"
           android:layout_marginLeft="208dp"
           android:layout_marginTop="9dp"
           android:focusable="true">
           <TextView
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_gravity="center_vertical"
               android:layout_marginLeft="40dp"
               android:text="第二行"
               android:textSize="28sp" />
       </FrameLayout>
   </LinearLayout>
   <View
       android:id="@+id/id_focus"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:background="@drawable/settings_selector"
       android:visibility="gone" />
</FrameLayout> 

底部视图是我们要使用的焦点框

import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.FrameLayout;
public class MainActivity extends Activity implements View.OnFocusChangeListener{
    private String TAG ="qkmin";
    private int Layout1 = R.id.id_fl;
    private int Layout2 = R.id.id_fl_2;
    private View onFousView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
    }
    private void initViews() {
        FrameLayout frameLayout=findViewById(Layout1);
        FrameLayout frameLayout2=findViewById(Layout2);
        onFousView = findViewById(R.id.id_focus);
        //设置焦点变化
        frameLayout.setOnFocusChangeListener(this);
        frameLayout2.setOnFocusChangeListener(this);
    }
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus){
            Log.i(TAG,"onFocusChange"+v.getId());
            //设置焦点框的位置和
            Tools.focusAnimator(v,onFousView);
        }
    }
}

让我们看一下“工具”类别:

import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.view.View;
import android.view.ViewGroup;
public class Tools {
    private static int mFocusWidth;
    private static int mFoucsHeight;
    public static void focusAnimator(View v, View onFousView) {
        focusAnimator(v, onFousView, -1, 0, 0);
    }
    public static void focusAnimator(View parentView, final View focusView, int scrollY, int offSetX, int offSetY) {
        int[] fromLocation = new int[2];
        focusView.getLocationOnScreen(fromLocation);
        int fromWidth = focusView.getWidth();
        int fromHeight = focusView.getHeight();
        float fromX = fromLocation[0];
        float fromY = fromLocation[1];
        int[] toLocation = new int[2];
        parentView.getLocationOnScreen(toLocation);
        int toWidth = parentView.getWidth() + offSetX;
        int toHeight = parentView.getHeight() + offSetY;
        float toX = toLocation[0] - offSetX / 2;
        float toY = toLocation[1] - offSetY / 2;
        if (scrollY == -1) {
            if (focusView.getVisibility() == View.GONE)
                focusView.setVisibility(View.VISIBLE);
        }
        AnimatorSet animatorSet = new AnimatorSet();
        ObjectAnimator translateXAnimator = ObjectAnimator.ofFloat(focusView, "x", fromX, toX);
        translateXAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
            }
            @Override
            public void onAnimationRepeat(Animator animation) {
            }
            @Override
            public void onAnimationEnd(Animator animation) {
                if (focusView.getVisibility() == View.GONE) {
                    focusView.setVisibility(View.VISIBLE);
                }
            }
            @Override
            public void onAnimationCancel(Animator animation) {
                if (focusView.getVisibility() == View.GONE)
                    focusView.setVisibility(View.VISIBLE);
            }
        });
        ObjectAnimator translateYAnimator = ObjectAnimator.ofFloat(focusView, "y", fromY, toY);
        ValueAnimator scaleWidthAnimator = ObjectAnimator.ofFloat(focusView, "width", fromWidth, toWidth);
        scaleWidthAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float width = (Float) animation.getAnimatedValue();
                mFocusWidth = (int) width;
                ViewGroup.LayoutParams layoutParams = focusView.getLayoutParams();
                layoutParams.width = mFocusWidth;
                layoutParams.height = mFoucsHeight;
                focusView.setLayoutParams(layoutParams);
            }
        });
        ValueAnimator scaleHeightAnimator = ObjectAnimator.ofFloat(focusView, "height", fromHeight, toHeight);
        scaleHeightAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float height = (Float) animation.getAnimatedValue();
                mFoucsHeight = (int) height;
                ViewGroup.LayoutParams layoutParams = focusView.getLayoutParams();
                layoutParams.width = mFocusWidth;
                layoutParams.height = mFoucsHeight;
                focusView.setLayoutParams(layoutParams);
            }
        });
        animatorSet.playTogether(translateXAnimator, translateYAnimator, scaleWidthAnimator, scaleHeightAnimator);
        animatorSet.setDuration(150);
        animatorSet.start();
    }
}

主要方法是focusAnimator（）. 首先android tv焦点框特效，获取focusView的宽度，高度以及x，y坐标. 当您获得焦点视图的宽度android tv焦点框特效，高度以及x，y坐标时，将设置. 可以.

以下是项目地址

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