startPreview 失败但不是所有设备答案

【问题标题】：startPreview failed but not all devicesstartPreview 失败但不是所有设备
【发布时间】：2013-06-13 01:07:35
【问题描述】：

我收到错误 startPreview failed 但不是所有设备。在摩托罗拉 RAZR 和三星 Galaxy S3 中，它运行良好。有人告诉我他们在其他设备（Galaxy SII Lite、Galaxy Ace Duos、三星 Galaxy Y 等）上也遇到了同样的问题我正在尝试在三星 Galaxy Y 中进行测试，这就是我在 Logcat 中得到的结果

java.lang.RuntimeException: startPreview failed
    at android.hardware.Camera.startPreview(Native Method)
    at br.com.timo.tubagram.CameraSurfaceView.surfaceCreated(CameraSurfaceView.java:47)
    at android.view.SurfaceView.updateWindow(SurfaceView.java:601)
    at android.view.SurfaceView.updateWindow(SurfaceView.java:413)
    at android.view.SurfaceView.dispatchDraw(SurfaceView.java:358)
    at android.view.View.draw(View.java:7083)
    at android.view.SurfaceView.draw(SurfaceView.java:344)
    at android.view.View.buildDrawingCache(View.java:6842)
    at android.view.View.getDrawingCache(View.java:6628)
    at android.view.ViewGroup.drawChild(ViewGroup.java:1571)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
    at android.view.View.draw(View.java:7083)
    at android.widget.FrameLayout.draw(FrameLayout.java:357)
    at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
    at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
    at android.view.View.draw(View.java:7083)
    at android.widget.FrameLayout.draw(FrameLayout.java:357)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2108)
    at android.view.ViewRoot.draw(ViewRoot.java:1540)
    at android.view.ViewRoot.performTraversals(ViewRoot.java:1276)
    at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3770)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670)
    at dalvik.system.NativeStart.main(Native Method)

这是我的代码

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback, PreviewCallback{

    private SurfaceHolder holder;
    private Camera camera;
    private Camera.Parameters parameters;
    boolean front = false;

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

        this.holder = this.getHolder();
        this.holder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            this.holder = holder;
            camera = Camera.open();
            camera.setPreviewDisplay(holder);
            parameters = parametrosCamera();
            camera.setParameters(parameters);
            camera.setDisplayOrientation(90);
            camera.startPreview();
        } catch (IOException ioe) {
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        camera.stopPreview();
        camera.release();   
        camera = null;
    }

    private Parameters parametrosCamera(){
        Parameters parameters = camera.getParameters();
        List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();
        if (sizes != null){
            Size min = sizes.get(0);
            for (Size size : sizes){
                if (size.width < min.width){ 
                    min = size;
                }else{
                    parameters.setPreviewSize(min.width, min.height);
                    parameters.setPictureSize(min.width, min.height);
                }
            }
            parameters.set("orientation", "portrait");
            parameters.setRotation(90);
        }
        if (parameters.getFlashMode() != null){
            parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);
        }
        return parameters;
    }
}

还有我的PrincipalActivity

public class PrincipalActivity extends Activity{

Camera camera;
File sdImageMainDirectory;
CameraSurfaceView cameraSurfaceView;
Button principalActivity_bt_TirarFoto;
Button principalActivity_bt_VirarFoto;
Button principalActivity_bt_Aceitar;
Button principalActivity_bt_Cancelar;
FrameLayout preview;
ImageView principalActivity_iv_UltimaFoto;

HandlePictureStorage hps;
int wid = 0;
boolean imageSelected = false;
boolean front = false;
String caminhoImagens;
String url;

//  File storagePath = new File(Environment.getExternalStorageDirectory() + "/Tubagram/");

@SuppressWarnings("deprecation")
@SuppressLint("NewApi") 
public void onCreate(Bundle savedInstanceState) {
    Log.i("PrincipalActivity","onCreate");
    super.onCreate(savedInstanceState);

    setContentView(R.layout.principal_activity);
    principalActivity_bt_TirarFoto = (Button) findViewById(R.id.principalActivity_bt_TirarFoto);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    cameraSurfaceView = new CameraSurfaceView(principalActivity_bt_TirarFoto.getContext());
    cameraSurfaceView.setSoundEffectsEnabled(true);
    cameraSurfaceView.setDrawingCacheEnabled(true);
    preview = (FrameLayout) findViewById(R.id.principalActivity_fl_Camera);

    preview.addView(cameraSurfaceView);

    principalActivity_bt_TirarFoto.setSoundEffectsEnabled(true);
    principalActivity_bt_TirarFoto.setOnClickListener(new OnClickListener() {

        @SuppressLint("NewApi") 
        @Override
        public void onClick(View v) {
            Log.i("PrincipalActivity","onClick - TirarFoto");
            camera = cameraSurfaceView.getCamera();
            camera.takePicture(new ShutterCallback() {

                @Override
                public void onShutter() {
                    AudioManager mgr = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                    mgr.playSoundEffect(AudioManager.FLAG_PLAY_SOUND);

                }
            }, null, hps = new HandlePictureStorage());

            imageSelected = false;

            mostrarBotoesConfirma();

        }
    });

    principalActivity_bt_Aceitar = (Button) findViewById(R.id.principalActivity_bt_Aceitar);
    principalActivity_bt_Aceitar.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.i("PrincipalActivity","onClick - Aceitar");
            if (verificaInstagram()){

                ByteArrayOutputStream stream = new ByteArrayOutputStream();

                if (imageSelected){
                    Bitmap bitmap = ((BitmapDrawable)cameraSurfaceView.getBackground()).getBitmap();
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                }else{
                    hps.getBitmap().compress(Bitmap.CompressFormat.PNG, 100, stream);
                }

                salvarImagemSelecionada(stream.toByteArray());

                Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
                shareIntent.setType("image/*");

                caminhoImagens = getRealPathFromURI(Uri.parse(url));

                Log.i("Caminho imagem: ", caminhoImagens);

                shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + caminhoImagens));
                shareIntent.setPackage("com.instagram.android");

                startActivity(shareIntent);
                //                  }
            }else{
                Toast.makeText(v.getContext(), "Você não possui o Instagram no seu smartphone!", Toast.LENGTH_SHORT).show();
            }

        }
    });

    principalActivity_bt_Cancelar = (Button) findViewById(R.id.principalActivity_bt_Cancelar);
    principalActivity_bt_Cancelar.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.i("PrincipalActivity","onClick - Cancelar");

            esconderBotoesConfirma();

            cameraSurfaceView.setBackgroundColor(Color.TRANSPARENT);

            cameraSurfaceView.voltarCamera();
        }
    });

    int qtdCameras = Camera.getNumberOfCameras();
    principalActivity_bt_VirarFoto = (Button) findViewById(R.id.principalActivity_bt_VirarFoto);
    if(qtdCameras > 1){
        principalActivity_bt_VirarFoto.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Log.i("PrincipalActivity","onClick - VirarCamera");
                Thread t = new Thread(){
                    @Override
                    public void run() {
                        cameraSurfaceView.flipit();
                        front = cameraSurfaceView.getFront();
                    }
                };
                t.start();
            }
        });
    }else{
        principalActivity_bt_VirarFoto.setVisibility(View.INVISIBLE);
    }

    LinearLayout principalActivity_ll_Molduras = (LinearLayout) findViewById(R.id.principalActivity_ll_Molduras);
    principalActivity_ll_Molduras.setVisibility(View.VISIBLE);

    List<Integer> listaMoldurasMenores = new ArrayList<Integer>();
    final List<Integer> listaMoldurasMaiores = new ArrayList<Integer>();

    //      listaMoldurasMenores.add(R.drawable.moldura_menor0);
    listaMoldurasMenores.add(R.drawable.moldura_menor1);
    listaMoldurasMenores.add(R.drawable.moldura_menor2);
    listaMoldurasMenores.add(R.drawable.moldura_menor3);
    listaMoldurasMenores.add(R.drawable.moldura_menor4);
    listaMoldurasMenores.add(R.drawable.moldura_menor5);
    listaMoldurasMenores.add(R.drawable.moldura_menor6);

    listaMoldurasMaiores.add(R.drawable.moldura_maior1);
    listaMoldurasMaiores.add(R.drawable.moldura_maior2);
    listaMoldurasMaiores.add(R.drawable.moldura_maior3);
    listaMoldurasMaiores.add(R.drawable.moldura_maior4);
    listaMoldurasMaiores.add(R.drawable.moldura_maior5);
    listaMoldurasMaiores.add(R.drawable.moldura_maior6);

    for (int i = 0; i < listaMoldurasMenores.size(); i++) {
        final ImageView imagem_moldura = new ImageView(this);
        imagem_moldura.setScaleType(ScaleType.FIT_XY);
        imagem_moldura.setId(i);
        imagem_moldura.setImageResource(listaMoldurasMenores.get(i));
        imagem_moldura.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Log.i("PrincipalActivity","onClick - Molduras");
                ImageView imagem_moldura_maior = new ImageView(v.getContext());
                imagem_moldura_maior.setImageResource(listaMoldurasMaiores.get(imagem_moldura.getId()));
                preview.setForeground(imagem_moldura_maior.getDrawable());
            }
        });
        principalActivity_ll_Molduras.addView(imagem_moldura,i);
    }

    principalActivity_iv_UltimaFoto = (ImageView) findViewById(R.id.principalActivity_iv_UltimaFoto);
    principalActivity_iv_UltimaFoto.setAdjustViewBounds(false);

    Uri uri = buscaUltimaFotoAlbum();
    Drawable backgroundGaleria;

    if (uri != null){
        String caminhosImagensGaleria = getRealPathFromURI(uri);
        backgroundGaleria = Drawable.createFromPath(caminhosImagensGaleria);
        principalActivity_iv_UltimaFoto.setBackgroundDrawable(backgroundGaleria);
    }else{
        principalActivity_iv_UltimaFoto.setBackgroundResource(R.drawable.box_imagem_album);
    }

    principalActivity_iv_UltimaFoto.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
            final int ACTION_SELECT_IMAGE = 1;
            intent.putExtra("crop", "true");
            intent.putExtra("aspectX", 10);
            intent.putExtra("aspectY", 10);
            intent.putExtra("outputX", 256);
            intent.putExtra("outputY", 256);
            intent.putExtra("scale", true);
            intent.putExtra("return-data", true);
            startActivityForResult(intent,ACTION_SELECT_IMAGE);
        }
    });
}

编辑 1 - 2013 年 6 月 20 日

我更改了一些代码，现在在我的 Galaxy Y 中运行，但我的带摄像头的 FrameLayout 无法正常工作。我在 FrameLayout 上出现黑屏。有谁知道为什么？

我改变了什么：

我在构造函数中添加了这一行

this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

我把我的surfaceCreated 和surfaceChanged 改成了这个

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    try {
        camera.stopPreview();
        parameters = parametrosCamera();
        camera.setParameters(parameters);
        camera.setDisplayOrientation(90);
        camera.setPreviewDisplay(holder);
        camera.startPreview();
    } 
    catch (IOException e) {
    } 
    catch (Exception e){
    }
}

@SuppressLint("NewApi") 
@Override
public void surfaceCreated(SurfaceHolder holder) {
    try {
        camera = Camera.open(0);
        camera.setPreviewDisplay(this.holder);
        camera.startPreview();
    } catch (IOException ioe) {
    } catch (Exception e){
    }
}

附言

我添加了一些日志来获取我的 setPreviewSize 使用我的方法得到的大小

private Parameters parametersCamera(){
    Parameters parameters = camera.getParameters();
    List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();
    if (sizes != null){
        Size min = sizes.get(0);
        for (Size size : sizes){
            if (size.width < min.width){
                min = size;
            }else{
                parameters.setPreviewSize(min.width, min.height);
                parameters.setPictureSize(min.width, min.height);
                Log.i("Ultima Camera Width: " + min.width, "Ultima Camera Height: " + min.height);
            }
        }
        parameters.set("orientation", "portrait");
        parameters.setRotation(90);
    }
    if (parameters.getFlashMode() != null){
        parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);
    }
    return parameters;
}

我在surfaceChanged 中添加了一个Log 来获取宽度和高度（我不使用这个宽度和高度），看看是否相同，我得到了这个结果

摩托罗拉 RAZR HD（运行良好）

表面变化：540 x 573 方法参数相机：640 x 480

三星 Galaxy Y（不显示我的预览）

surfaceChanged：240 x 162（宽 x 高）方法parametrosCamera：320 x 240

在我的方法parametersCamera中我使用了这两行

parameters.set("orientation", "portrait");
parameters.setRotation(90);

我认为我的问题的答案就在我的这部分代码中。

【问题讨论】：

有人认识这个吗？

标签： android parameters android-camera preview

【解决方案1】：

您似乎正在寻找支持的最小预览大小。但是如果不支持此尺寸作为图片尺寸，您的代码会将相机初始化为不受支持的状态。某些设备可能会选择在这种状态下无法打开预览。

我不确定您是否真的需要图片大小等于预览帧大小。如果不这样做，您可以简单地分别迭代来自 parameters.getSupportedPictureSizes() 的值。

另一个常见错误（不一定适用于您的用例）源于后置摄像头的尺寸与前置摄像头的尺寸不匹配。因此，切换相机时必须始终重新计算尺寸。

【讨论】：

【解决方案2】：

问题没有使用相机管理器相关的库，因此对海报提出问题没有用（我认为它很古老，我认为他已经修复或不再关心发布），但是这个答案可能会有所帮助或修复仅在某些不同设备上遇到问题 startpreview 错误的用户。

原因

经过深度调试，我发现相机管理器库如果没有精确的尺寸匹配，会尝试使用最大的合适分辨率。

如CameraConfiguration.findBestPreviewSizeValue()：

// If no exact match, use largest preview size. This was not a great
// idea on older devices because
// of the additional computation needed. We're likely to get here on
// newer Android 4+ devices, where
// the CPU is much more powerful.
if (!supportedPreviewSizes.isEmpty()) {
    Camera.Size largestPreview = supportedPreviewSizes.get(0);
    Point largestSize = new Point(largestPreview.width, largestPreview.height);
    Log.i(TAG, "Using largest suitable preview size: " + largestSize);
    return largestSize;
}

这对设备的制造商来说很好，在支持的预览尺寸上设置正确。

但是事情有时会发生！设备可能会报告荒谬的高分辨率，这在startPreview() 上压倒了设备，内部驱动程序错误发生“预览超时”，仅在目录中可见。

让我们修复它！

改用最接近屏幕的分辨率！

修改 CameraConfiguration.java 或者可能在 CameraConfigurationUtils.java 中：

... 跳过行，直到找到下一个模式（请注意，您的来源可能略有不同！）

+ 加行

- 删除行

...
...
public static Point findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution) {
...
...
    // Find a suitable size, with max resolution
    int maxResolution = 0;
    Camera.Size maxResPreviewSize = null;
  + double closestResolutionDrift = 1024*1024;
  + Camera.Size closestResolution = null;
    for (Camera.Size size : rawSupportedSizes) {
...
...
        Log.i(TAG, "Found preview size exactly matching screen size: " + exactPoint);
        return exactPoint;
    }
  + 
  + double drift = (maybeFlippedWidth * maybeFlippedHeight)-(screenResolution.x * screenResolution.y);
  + if (drift < closestResolutionDrift && resolution>(screenResolution.x * screenResolution.y)) {
  +   closestResolutionDrift = drift;
  +   closestResolution = size;
  + }
...
...
    //If no exact match, use largest preview size. This was not a great idea on older devices because
    //of the additional computation needed. We're likely to get here on newer Android 4+ devices, where
    //the CPU is much more powerful.
  - if (maxResPreviewSize != null) {
  -      Point largestSize = new Point(maxResPreviewSize.width, maxResPreviewSize.height);
  -     Log.i(TAG, "Using largest suitable preview size: " + largestSize);
  -     return largestSize;
  - }
  + //if (maxResPreviewSize != null) {
  + //     Point largestSize = new Point(maxResPreviewSize.width, maxResPreviewSize.height);
  + //    Log.i(TAG, "Using largest suitable preview size: " + largestSize);
  + //    return largestSize;
  + //}
  + 
  + // Dont! Some low end device still report ridiculous high resolution which overwhelming startPreview!
  + if(closestResolution!=null){
  +     Point closestSize = new Point(closestResolution.width, closestResolution.height);
  +     Log.i(TAG, "Using closest suitable preview size: " + closestSize);
  +     return closestSize;
  + }

【讨论】：