智能TV开发笔记（三）简单的焦点控制--继续篇

          最初接手电视时，有个朋友发我一个demo，是关于焦点的。今天，我就想来仔细阅读一下这个demo.

         从第一个MainActivity开始

        

布局代码：activity_main.xml

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical">

        <Button
            android:id="@+id/btn_normal"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="normal focus"/>

        <Button
            android:id="@+id/btn_module"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="module focus - horizontal"/>

        <Button
            android:id="@+id/btn_module_vertical"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="module focus - vertical"/>

        <Button
            android:id="@+id/btn_auto_focus"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="auto process focus"/>

        <Button
            android:id="@+id/btn_maul_focus"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="no focus - horizontal"/>

        <Button
            android:id="@+id/btn_maul_vertical_focus"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:textAllCaps="false"
            android:text="no focus - vertical"/>
        <TextView
            android:id="@+id/tv_test"
            android:layout_width="200dp"
            android:layout_height="80dp"
            android:text="test"
            android:background="@color/brown"
            android:gravity="center"
            android:focusable="true"
            />
    </LinearLayout>

</RelativeLayout>

   tv_test这个按钮是我自己添加的。我主要是想说textview和button两者的区别。如果控件是button，可以不用添加focusable=true，不添加点击事件，它自己都可以获取到焦点。按着从上到下的顺序随着遥控器移动。如果是textview，则一定要写上focusable=true，否则，即使你写了点击事件也是没有用的。

MainActivity.java

package com.app.tvrecyclerview;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btnNormal = (Button) findViewById(R.id.btn_normal);
        btnNormal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, NormalFocusActivity.class);
                startActivity(intent);
            }
        });

        Button btnModule = (Button) findViewById(R.id.btn_module);
        btnModule.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, ModuleFocusActivity.class);
                startActivity(intent);
            }
        });

        Button btnModuleV = (Button) findViewById(R.id.btn_module_vertical);
        btnModuleV.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, ModuleFocusVerticalActivity.class);
                startActivity(intent);
            }
        });

        Button btnAuto = (Button) findViewById(R.id.btn_auto_focus);
        btnAuto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, AutoCarouselActivity.class);
                startActivity(intent);
            }
        });

        Button btnMaulHorizontal = (Button) findViewById(R.id.btn_maul_focus);
        btnMaulHorizontal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, maulCarouselActivity.class);
                startActivity(intent);
            }
        });

        Button btnMaulVertical = (Button) findViewById(R.id.btn_maul_vertical_focus);
        btnMaulVertical.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, maulVerticalCarouselActivity.class);
                startActivity(intent);
            }
        });
        final TextView tv_test= (TextView) findViewById(R.id.tv_test);
        tv_test.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if(hasFocus){
                    //选中的焦点改变颜色
                    tv_test.setBackgroundColor(0xff795548);
                }else{
                    tv_test.setBackgroundColor(0xffd2d6d8);
                }
            }
        });

    }
}

再如我写一个选择对话框：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="@dimen/width_dialog"
    android:background="@drawable/bg_dialog_1"
    android:padding="@dimen/main_padding_30"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="检测到新版本，是否更新"
        style="@style/text_white_14"
        />
   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_marginTop="@dimen/main_padding_20"
       android:orientation="horizontal"
       >
       <Button
           android:id="@+id/tv_ok"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:text="是"
           style="@style/text_white_14"
           android:gravity="center"
           android:background="@drawable/btn_unselected"
           />
       <Button
           android:id="@+id/tv_cancel"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:text="否"
           style="@style/text_white_14"
           android:gravity="center"
           android:layout_marginLeft="@dimen/main_padding_20"
           android:background="@drawable/btn_unselected"
           />
   </LinearLayout>
</LinearLayout>

public static Dialog getVersionUpdateDialog(Activity thisRef, String content,OnClickListener oklistener,OnClickListener closelistener) {
    final Dialog dialog = new Dialog(thisRef, R.style.PickDialog);
    dialog.setCanceledOnTouchOutside(false);
    dialog.show();
    Window window = dialog.getWindow();
    window.setContentView(R.layout.dialog_version);
    window.setBackgroundDrawableResource(android.R.color.transparent);
    WindowManager.LayoutParams lp = window.getAttributes();
    lp.width = ViewGroup.LayoutParams.WRAP_CONTENT;
    lp.height = ViewGroup.LayoutParams.WRAP_CONTENT;
    lp.gravity = Gravity.CENTER_HORIZONTAL;
    window.setAttributes(lp);
    TextView tvcontent = (TextView) window.findViewById(R.id.tv_content);
    final Button tv_ok = (Button) window.findViewById(R.id.tv_ok);
    final Button tv_cancel = (Button) window.findViewById(R.id.tv_cancel);

    tvcontent.setText(Html.fromHtml(content));
    if(oklistener!=null){
        tv_ok.setOnClickListener(oklistener);
    }else{
        tv_ok.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });
    }
    if(closelistener!=null){
        tv_cancel.setOnClickListener(closelistener);
    }else {
        tv_cancel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });
    }
    tv_ok.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if(hasFocus){
                tv_ok.setBackgroundResource(R.drawable.btn_selected);
            }else{
                tv_ok.setBackgroundResource(R.drawable.btn_unselected);
            }
        }
    });
    tv_cancel.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if(hasFocus){
                tv_cancel.setBackgroundResource(R.drawable.btn_selected);
            }else{
                tv_cancel.setBackgroundResource(R.drawable.btn_unselected);
            }
        }
    });
    return dialog;
}