我收到错误startPreview失败但不是所有设备。 在摩托罗拉RAZR和三星Galaxy S3中，它运行良好。 有些人告诉我他们在其他设备上遇到了同样的问题（Galaxy SII Lite，Galaxy Ace Duos，Samsung Galaxy Y等） 我正试图在三星Galaxy Y中测试，这是我在Logcat中得到的东西
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)
我的代码在哪里
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;
}
}
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);
}
});
}
我改变了一点我的代码，现在在我的Galaxy Y中运行，但我的FrameLayout与相机无法正常工作。我在FrameLayout上获得了黑屏。 谁知道为什么？
我改变了什么：
我把这一行放在我的构造函数
中this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
我将surfaceCreated和surfaceChanged更改为此
@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){
}
}
我放了一些Log来获取my setPreviewSize使用我的方法获得的大小
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);
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;
}
然后我登录surfaceChanged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
surfaceChanged：540 x 573 方法parametrosCamera：640 x 480
surfaceChanged：240 x 162（宽x高） 方法parametrosCamera：320 x 240
在我的方法parametrosCamera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代码的这一部分。
答案 0 :(得分：0)
您似乎在寻找支持的最小预览尺寸。但是，如果图片大小不支持此尺寸，则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无法在此状态下打开预览。
我不确定你真的需要图片大小等于预览帧大小。如果您不这样做，则可以单独对parameters.getSupportedPictureSizes()的值进行迭代。
另一个常见错误（不一定适用于您的使用案例）的根源在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。
答案 1 :(得分：0)
问题未使用与相机管理器相关的库，因此提问海报没有用（我认为它的古老我认为他已经修复或不再关心发布），但是此答案可能会有所帮助或修复仅在某些各种设备上遇到问题 startpreview 错误的用户。
原因
经过深度调试，我发现如果没有精确的尺寸匹配，相机管理器库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;
}
这对设备制造商已正确设置支持的预览尺寸很好。
但事情有时会发生！设备可能会报告荒谬的高分辨率，使设备在 startPreview() 上不堪重负，其中发生内部驱动程序错误“预览超时”，仅在目录中可见。
让我们修复它！
修改 CameraConfiguration.java 或可能在 CameraConfigurationUtils.java 中：
<块引用>... 跳过几行直到找到下一个模式（请注意，您的来源可能略有不同！）
+ 添加行
- 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;
+ }