android – 在SurfaceView加载Camera Preview时显示我的布局

概述我有一个带开始按钮的简单屏幕.按下“开始”按钮后,我想转到带有SurfaceView的新屏幕以显示摄像机. 一切正常,但相机需要一段时间才能加载,这给了我一个黑屏. 我想加载新的布局.并且在装载后启动相机… 因此,我在后台线程中完成所有相机加载,但仍然,我得到一个黑屏…… 这是我的布局： <?xml version="1.0" encoding="utf-8"?><RelativeLayout 我有一个带开始按钮的简单屏幕.按下“开始”按钮后,我想转到带有SurfaceVIEw的新屏幕以显示摄像机.

一切正常,但相机需要一段时间才能加载,这给了我一个黑屏.
我想加载新的布局.并且在装载后启动相机…@H_404_4@

因此,我在后台线程中完成所有相机加载,但仍然,我得到一个黑屏……
这是我的布局：@H_404_4@

<?xml version="1.0" enCoding="utf-8"?><relativeLayout androID:ID="@+ID/relativeLayout1"xmlns:androID="http://schemas.androID.com/apk/res/androID"androID:orIEntation="vertical" androID:layout_wIDth="fill_parent"androID:layout_height="fill_parent"androID:background="@drawable/blue_bg">    <SurfaceVIEw        androID:ID="@+ID/surface_camera"        androID:layout_wIDth="fill_parent"        androID:layout_height="fill_parent"        androID:layout_marginleft="25dp"        androID:layout_marginRight="25dp"        androID:layout_below="@ID/scan_header"        androID:layout_above="@ID/scan_footer">    </SurfaceVIEw></relativeLayout>

这是我的Activity中的方法,它加载新视图：@H_404_4@

private voID setContent(){    setContentVIEw(R.layout.scan)    Thread t = new Thread()    {        public voID run()        {            final SurfaceVIEw mSurfaceVIEw = (SurfaceVIEw)findVIEwByID(R.ID.surface_camera);            final SurfaceHolder mSurfaceHolder = mSurfaceVIEw.getHolder();            try            {                   cameraview = new Cameraview();                mSurfaceHolder.addCallback(cameraview);                cameraview.setPictureListener(SunpluggedActivity.this);                mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);            } catch(Exception e)            {                Log.d(TAG,"Another exception");                e.printstacktrace();            }        }    };    t.start();}

为什么新的布局没有显示,直到线程完成加载相机？@H_404_4@

编辑：我已经尝试Thread中的Thread.sleep(200)睡了一段时间…当我这样做时,新的布局显示出来,但相机永远不会启动…@H_404_4@解决方法 好吧,问题是我在xml布局中使用了SurfaceVIEw.
你打电话的那一刻：setContentVIEw(your_layout) – > XML文件被夸大了.
这意味着,SurfaceVIEw也会膨胀.这再次意味着调用SurfaceVIEw onSurfaceCreated方法,触发打开相机等.

因此,整个过程需要一段时间,因此,您之前的Activity(例如,使用SurfaceVIEw启动Activity的那个)似乎没有响应……@H_404_4@

我在BG线程中创建Cameraview的解决方案解决了无响应问题.但未能在SurfaceVIEw中显示Camera输出.@H_404_4@

解决方案是从xml中删除SurfaceVIEw.这将立即启动您的活动(因为SurfaceVIEw& Camera未实例化).
加载新的“活动”布局后,可以以编程方式将新的SurfaceVIEw添加到屏幕上.当然,这也需要时间,但您的UI会快速切换到新活动,并且您可以在SurfaceVIEw和Camera加载时显示加载程序！@H_404_4@

所以：从XML中删除SURFACEVIEW – >在程序上添加它：
发布活动：@H_404_4@

public class Launch extends Activity implements OnClickListener {    @OverrIDe    public voID onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);         setContentVIEw(R.layout.main);        button btn = (button)findVIEwByID(R.ID.button1);        btn.setonClickListener(this);    }    @OverrIDe    public voID onClick(VIEw v) {        Intent intent = new Intent(Launch.this,SurfaceTestActivity.class);        startActivity(intent);      }}

Main.xml(只是一个启动新活动的按钮)@H_404_4@

<?xml version="1.0" enCoding="utf-8"?><relativeLayout androID:ID="@+ID/relativeLayout1"    xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:orIEntation="vertical" androID:layout_wIDth="fill_parent"    androID:layout_height="fill_parent"    androID:background="#ff6600">    <button        androID:ID="@+ID/button1"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="button" /></relativeLayout>

这是第二个活动(包含SurfaceVIEw)@H_404_4@

public class SurfaceTestActivity extends Activity {    private Context mContext;    private Cameraview cameraview;    private Handler mHandler = new Handler();    private final Runnable mloadCamera = new Runnable()    {        public voID run()        {            startCamera();        }    };    /** Called when the activity is first created. */    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContent();        mContext = getApplicationContext();    }    private voID startCamera()    {        relativeLayout rl = (relativeLayout)findVIEwByID(R.ID.surface_camera);        SurfaceVIEw surfaceVIEw = new SurfaceVIEw(mContext);        final SurfaceHolder mSurfaceHolder = surfaceVIEw.getHolder();        try        {              cameraview = new Cameraview();            mSurfaceHolder.addCallback(cameraview);            mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        } catch(Exception e)        {            Log.d("deBUG","Another exception");            e.printstacktrace();        }        if(rl != null && surfaceVIEw != null)            rl.addVIEw(surfaceVIEw);    }    private voID setContent()    {        setContentVIEw(R.layout.scan);        // Post the Runnable with a Slight delay -> than your layout will be         // shown. Without the delay -> your UI will feel inresponsive        mHandler.postDelayed(mloadCamera,100);    }}

这是第二个Activity的布局(没有SURFACEVIEW)@H_404_4@

<?xml version="1.0" enCoding="utf-8"?><relativeLayout androID:ID="@+ID/relativeLayout1"    xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:orIEntation="vertical" androID:layout_wIDth="fill_parent"    androID:layout_height="fill_parent"    androID:background="#ff6600">    <relativeLayout         androID:ID="@+ID/header"        androID:layout_wIDth="fill_parent" androID:layout_height="wrap_content">        <TextVIEw            androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content"            androID:text="Explanation Txt"></TextVIEw>    </relativeLayout>    <relativeLayout         androID:ID="@+ID/footer"        androID:layout_wIDth="fill_parent" androID:layout_height="wrap_content"        androID:layout_alignParentBottom="true">        <TextVIEw            androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content"            androID:text="Explanation Txt"></TextVIEw>    </relativeLayout>    <relativeLayout        androID:ID="@+ID/surface_camera"        androID:layout_wIDth="fill_parent"        androID:layout_height="match_parent"        androID:layout_above="@+ID/footer"        androID:layout_below="@+ID/header"         androID:background="#ff0066">    </relativeLayout></relativeLayout>

最后,为了完成答案,这里是Cameraview()的代码.打开相机并显示内容真的只是一个简单的实现：@H_404_4@

public class Cameraview  implements SurfaceHolder.Callback{    // Variables    private Camera mCamera = null;    private boolean mPrevIEwRunning = false;    private boolean mProcessing = false;    private int mWIDth = 0;    private int mHeight = 0;    @OverrIDe    public voID surfaceChanged(SurfaceHolder holder,int format,int wIDth,int height)     {           if(mPrevIEwRunning )        {            mCamera.stopPrevIEw();        }        // Store wIDth and height        mWIDth = wIDth;        mHeight = height;        // Set camera parameters        Camera.Parameters p = mCamera.getParameters();        mCamera.setParameters(p);        if(androID.os.Build.VERSION.SDK_INT >= 8)        {   // If API >= 8 -> rotate display...            mCamera.setdisplayOrIEntation(90);        }        try        {            mCamera.setPrevIEwdisplay(holder);        } catch(IOException e)        {            e.printstacktrace();        }        mCamera.startPrevIEw();        mPrevIEwRunning = true;    }    @OverrIDe    public voID surfaceCreated(final SurfaceHolder holder)     {        try {            mCamera = Camera.open();            mCamera.setPrevIEwdisplay(holder);        } catch (IOException e)         {            mCamera.release();            mCamera = null;            e.printstacktrace();        }    }    @OverrIDe    public voID surfaceDestroyed(SurfaceHolder holder)     {        if(mCamera != null)        {            mCamera.setPrevIEwCallback(null);            mCamera.stopPrevIEw();            mCamera.setPrevIEwCallback(null);            mPrevIEwRunning = false;            mCamera.release();            mCamera = null;        }       }}

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