android秒启动unity，和给unity添加过渡图片

1，本篇不讲解unity如何集成，网上很多，主要讲解下面几个点
一，最容易出现的bug
二，快速启动unity
三，帮unity添加过渡图和可能会遇到的问题

一，android 在退出unity的时候，unity会执行结束进程，同时也会结束掉你的APP的进程
解决办法是
重写unityplay，重写kill方法。搞定

public class MyUnityPlay extends UnityPlayer {    public MyUnityPlay(ContextWrapper contextWrapper) {        super(contextWrapper);    }    @Override    protected void kill() {    }}

二，快速启动unity
首先看下unity导出后的默认代码

package com.sunwentao.liuliuqiu;import com.unity3d.player.*;import android.app.Activity;import android.content.Intent;import android.content.res.Configuration;import android.graphics.PixelFormat;import android.os.Bundle;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.WindowManager;public class UnityPlayerActivity extends Activity{    protected UnityPlayer mUnityPlayer; // don't change the name of this variable; referenced from native code    // Setup activity layout    @Override protected void onCreate (Bundle savedInstanceState)    {        requestWindowFeature(Window.FEATURE_NO_TITLE);        super.onCreate(savedInstanceState);        getWindow().setFormat(PixelFormat.RGBX_8888); // <--- This makes xperia play happy        mUnityPlayer = new UnityPlayer(this);        setContentView(mUnityPlayer);        mUnityPlayer.requestFocus();    }    @Override protected void onNewIntent(Intent intent)    {        // To support deep linking, we need to make sure that the client can get access to        // the last sent intent. The clients access this through a JNI api that allows them        // to get the intent set on launch. To update that after launch we have to manually        // replace the intent with the one caught here.        setIntent(intent);    }    // Quit Unity    @Override protected void onDestroy ()    {        mUnityPlayer.quit();        super.onDestroy();    }    // Pause Unity    @Override protected void onPause()    {        super.onPause();        mUnityPlayer.pause();    }    // Resume Unity    @Override protected void onResume()    {        super.onResume();        mUnityPlayer.resume();    }    // Low Memory Unity    @Override public void onLowMemory()    {        super.onLowMemory();        mUnityPlayer.lowMemory();    }    // Trim Memory Unity    @Override public void onTrimMemory(int level)    {        super.onTrimMemory(level);        if (level == TRIM_MEMORY_RUNNING_CRITICAL)        {            mUnityPlayer.lowMemory();        }    }    // This ensures the layout will be correct.    @Override public void onConfigurationChanged(Configuration newConfig)    {        super.onConfigurationChanged(newConfig);        mUnityPlayer.configurationChanged(newConfig);    }    // Notify Unity of the focus change.    @Override public void onWindowFocusChanged(boolean hasFocus)    {        super.onWindowFocusChanged(hasFocus);        mUnityPlayer.windowFocusChanged(hasFocus);    }    // For some reason the multiple keyevent type is not supported by the ndk.    // Force event injection by overriding dispatchKeyEvent().    @Override public boolean dispatchKeyEvent(KeyEvent event)    {        if (event.getAction() == KeyEvent.ACTION_MULTIPLE)            return mUnityPlayer.injectEvent(event);        return super.dispatchKeyEvent(event);    }    // Pass any events not handled by (unfocused) views straight to UnityPlayer    @Override public boolean onKeyUp(int keyCode, KeyEvent event)     { return mUnityPlayer.injectEvent(event); }    @Override public boolean onKeyDown(int keyCode, KeyEvent event)   { return mUnityPlayer.injectEvent(event); }    @Override public boolean onTouchEvent(MotionEvent event)          { return mUnityPlayer.injectEvent(event); }    /*API12*/ public boolean onGenericMotionEvent(MotionEvent event)  { return mUnityPlayer.injectEvent(event); }}

去掉ondestory方法，当用户点击了unity的退出按钮的时候，会回调android的一个方法，比如是exit
,

  public void exit(){    mUnityPlayer.pause();        moveTaskToBack(true);  }

首先暂停unity,然后将当年的界面移到后台，不关闭unityplayactivity这个界面，
有的人肯定会问 这样不会耗资源吗，只要你调用了mUnityPlayer.pause()
那么就不怎么会耗你的资源，从你的手机发烫的程度就可以知道，如果你开着unity10-20分钟你肯定能感觉你的手机很烫了，但是你在退出的时候调用暂停这个方法，手机就不会发烫，说明unity消耗的资源不多，
当然unity那边的场景在每次你点击退出的时候都应该清掉

从上面的代码可以看到我们并没有关闭unityplay这个界面，所以我们再次打开是很快的，基本上是秒开，
所以和unity的交互不能写在oncreate里面，应该写在unresume里面，这样每次你进来都能重新调用unity，并加载出界面比如下面这样

    // Resume Unity    @Override    protected void onResume() {        super.onResume();        new Handler().post(new Runnable() {            @Override            public void run() {//                if (!isFirst){                mUnityPlayer.resume();//                }                UnityPlayer.currentActivity.runOnUiThread(new Runnable() {                    @Override                    public void run() {                        if (CURREN_MODE == xxxx) {                            UnityPlayer.UnitySendMessage("xxxxx", "xxxx", "");                        } else if (CURREN_MODE == xxxx) {                            UnityPlayer.UnitySendMessage("xxxxx", "xxxxx", xxx);                        } else if (CURREN_MODE == xxxxx) {                            UnityPlayer.UnitySendMessage("xxxxx", "xxxxx", xxx);                        }                    }                });            }        });    }

调用 mUnityPlayer.resume()
让unity重新开始工作，接着发送交互信息，这样就实现了，你只需要加载一次unity界面，下次你在进来是非常快的(做过unity集成的都知道unity在安卓手机上启动是有多慢);

三，添加过渡页
首先看下代码

    @Override    protected void onCreate(Bundle savedInstanceState) {        requestWindowFeature(Window.FEATURE_NO_TITLE);        super.onCreate(savedInstanceState);        getWindow().setFormat(PixelFormat.RGBX_8888); // <--- This makes xperia play happy        mUnityPlayer = new MyUnityPlay(this);        SpUtils.setConext(this);        setContentView(mUnityPlayer);        mUnityPlayer.requestFocus();            try {                bgView = new ImageView(UnityPlayer.currentActivity);                bgView.setImageResource(R.drawable.unityloading2x);                bgView.setScaleType(ImageView.ScaleType.FIT_XY);                Resources r = mUnityPlayer.currentActivity.getResources();                mUnityPlayer.addView(bgView, r.getDisplayMetrics().widthPixels, r.getDisplayMetrics().heightPixels);            } catch (Exception e) {                e.printStackTrace();            }    }

代码很简单，这样写不会出现黑屏的问题，我以前用的dialog显示一张图片，很大的概率出现黑屏，可能是dialog挡住了unityplay的绘制。
上面这样写是没问题的，
然后在unity开始执行第一帧的时候，调用你的一个方法，你在把这个image移除掉

   try {                if (bgView == null)                    return;                UnityPlayer.currentActivity.runOnUiThread(new Runnable() {                    public void run() {                        mUnityPlayer.removeView(bgView);                        bgView = null;                    }                });            } catch (Exception e) {                e.printStackTrace();            }

这个方法你和unity那边沟通确定好就行了，方法名都是随便定义的

就这么多，有问题欢迎讨论