Android TV，机顶盒Gridview 焦点

切换两个控件之间的焦点，TV、机顶盒用android自带的控件 例如listview或者gridview 是，因为需要适配手机等，所以控件某些方面（如每个控件的焦点，切换时的速度，位置等）是不会很匹配TV、机顶盒的.最好的方法是自己绘制一个gridview

正常的GridView，然而item的控件就需要自定义了：
MyImageView

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.ImageView;

@SuppressLint("AppCompatCustomView")
public class MyImageView extends ImageView {

    public MyImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public MyImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyImageView(Context context) {
        super(context);
    }

    @Override
    protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);

        if (gainFocus) {

            setBackgroundColor(Color.rgb(255, 138, 0));

        } else {
            // 此处为去掉控件高亮显示
            setBackgroundColor(0);
        }
    }
}

MyTextView

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.TextView;

@SuppressLint("AppCompatCustomView")
public class MyTextView extends TextView {
    private static final String TAG = "textview";

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        // TODO Auto-generated method stub
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        // 此处为该控件获得焦点后高亮显示
        if (focused) {

            setBackgroundColor(Color.rgb(255, 138, 0));

        } else {
            // 此处为去掉控件高亮显示
            setBackgroundColor(0);
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        Log.d("onkeydown", "onkeydown");
        return super.onKeyDown(keyCode, event);
    }

    public MyTextView(Context context) {
        super(context);

    }

    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

    }

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

    }
}

item引用