AndroidTV焦點(diǎn)框移動(dòng)的實(shí)現(xiàn)方法

Tv開發(fā)，最重要的當(dāng)然是焦點(diǎn)框的移動(dòng)，有了焦點(diǎn)框我們才能知道當(dāng)前選中的是哪一個(gè)，我們來看下效果圖：

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Android TV 焦點(diǎn)框移動(dòng)的實(shí)現(xiàn)方法

那它是怎么實(shí)現(xiàn)的呢，我們一起來看下。

原理

布局上使用一個(gè)view，背景是.9圖片做焦點(diǎn)框，選中一個(gè)控件的時(shí)候把這個(gè)view移動(dòng)選中的控件的位置。怎么樣，是不是很簡單，行動(dòng)起來。先看下布局

codeing

布局：

<?xml version="1.0" encoding="utf-8"?>

最底下的View就是我們要用到的焦點(diǎn)框

代碼

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);
    //設(shè)置焦點(diǎn)變化監(jiān)聽
    frameLayout.setOnFocusChangeListener(this);
    frameLayout2.setOnFocusChangeListener(this);
  }

  @Override
  public void onFocusChange(View v, boolean hasFocus) {
    if (hasFocus){
      Log.i(TAG,"onFocusChange"+v.getId());
      //設(shè)置焦點(diǎn)框的位置和動(dòng)畫
      Tools.focusAnimator(v,onFousView);
    }
  }
}

我們來看下Tools 這個(gè)類：

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（），首先獲取focusView的寬、高，以及x ,y 坐標(biāo)，在得到獲取焦點(diǎn)的view的寬、高，以及x ,y 坐標(biāo)，最會(huì)設(shè)置動(dòng)畫。這樣就Ok了。

下面是項(xiàng)目地址:https://gitee.com/love_k/FocusTest.git

以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。

新聞名稱：AndroidTV焦點(diǎn)框移動(dòng)的實(shí)現(xiàn)方法
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AndroidTV焦點(diǎn)框移動(dòng)的實(shí)現(xiàn)方法

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