Android Nexus 10,前向摄像头预览为黑色(无预览)
所以我正在做一个与相机相关的项目,我已经在很多设备上进行了测试,除了Nexus10之外,所有设备都通过了测试 我不知道到底发生了什么,也没有人在网上谈论这个问题 我能够在两个不同的Nexus10(wifi)设备上复制这个问题 以下是我的活动代码:Android Nexus 10,前向摄像头预览为黑色(无预览),android,android-camera,samsung-mobile,android-4.2-jelly-bean,nexus-10,Android,Android Camera,Samsung Mobile,Android 4.2 Jelly Bean,Nexus 10,所以我正在做一个与相机相关的项目,我已经在很多设备上进行了测试,除了Nexus10之外,所有设备都通过了测试 我不知道到底发生了什么,也没有人在网上谈论这个问题 我能够在两个不同的Nexus10(wifi)设备上复制这个问题 以下是我的活动代码: public class MainActivity extends Activity { private static Camera mCamera; private static boolean mCameraOpen; pr
public class MainActivity extends Activity {
private static Camera mCamera;
private static boolean mCameraOpen;
private static ImageView mPreviewImageView;
private SurfaceView mPreviewSurfaceView;
private static boolean mPreviewRunning;
private static Handler mHandler;
private static int TESTS_COUNT = 0;
private Camera.Parameters mCameraParameters;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new Handler();
mPreviewSurfaceView = (SurfaceView) findViewById(R.id.surfaceview);
mPreviewImageView = (ImageView) findViewById(R.id.imageview);
mPreviewSurfaceView.getHolder().addCallback(mCallback);
TextView view = (TextView) findViewById(R.id.textview);
view.setText("Format: " + String.valueOf(TESTS_COUNT));
}
@Override
public void onResume(){
super.onResume();
if (mCamera == null){
for (int i = 0; i < Camera.getNumberOfCameras(); i++){
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){
mCamera = Camera.open(i);
Camera.Parameters params = mCamera.getParameters();
params.set("camera-id", 2);
List<Integer> formats = params.getSupportedPreviewFormats();
if (formats.size() > TESTS_COUNT) {
Log.e("Camera", "testing preview format at index: " + TESTS_COUNT);
params.setPreviewFormat(formats.get(TESTS_COUNT));
mCamera.setParameters(params);
mCameraOpen = true;
SurfaceHolder holder = mPreviewSurfaceView.getHolder();
if (holder != null && holder.getSurface() != null && holder.getSurface().isValid()) {
mCallback.surfaceCreated(holder);
}
mCameraParameters = params;
break;
} else {
finish();
}
}
}
}
}
@Override
public void onPause(){
super.onPause();
if (mPreviewRunning){
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mPreviewRunning = false;
}
if (mCameraOpen){
mCamera.release();
mCamera = null;
mCameraOpen = false;
}
}
@Override
public void onDestroy(){
super.onDestroy();
}
private final SurfaceHolder.Callback mCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
if (mCameraOpen && mCamera != null){
try {
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.setPreviewCallback(new Camera.PreviewCallback() {
private int count;
private int total;
@Override
public void onPreviewFrame(byte[] bytes, Camera camera) {
if (count == 15){
Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
// pWidth and pHeight define the size of the preview Frame
ByteArrayOutputStream out = new ByteArrayOutputStream();
// Alter the second parameter of this to the actual format you are receiving
YuvImage yuv = new YuvImage(bytes, ImageFormat.NV21, previewSize.width, previewSize.height, null);
// bWidth and bHeight define the size of the bitmap you wish the fill with the preview image
yuv.compressToJpeg(new Rect(0, 0, previewSize.width, previewSize.height), 50, out);
byte[] bitmapBytes = out.toByteArray();
final Bitmap bitmap= BitmapFactory.decodeByteArray(bitmapBytes, 0, bitmapBytes.length);
mHandler.post(new Runnable() {
@Override
public void run() {
mPreviewImageView.setImageBitmap(bitmap);
}
});
count = 0;
total++;
if (total > 5){
TESTS_COUNT++;
if (TESTS_COUNT == mCameraParameters.getSupportedPreviewSizes().size()) {
finish();
return;
}
Intent intent = new Intent( MainActivity.this, MainActivity.class);
startActivity(intent);
}
} else {
count++;
}
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
for (Camera.Size size : mCameraParameters.getSupportedPreviewSizes()){
if (size.width == width && size.height == height){
if (mCameraOpen && mCamera != null && mPreviewRunning == false) {
mCameraParameters.setPreviewSize(width, height);
mCamera.setParameters(mCameraParameters);
mCamera.startPreview();
mPreviewRunning = true;
break;
}
}
}
if (mPreviewRunning == false){
Log.e("CameraPreview", "size not supported");
}
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
}
};
}
公共类MainActivity扩展活动{
专用静态摄像机;
私有静态布尔mCameraOpen;
私有静态图像视图mPreviewImageView;
private SurfaceView mPreviewSurfaceView;
私有静态布尔mPreviewRunning;
私有静态处理器;
私有静态int测试_计数=0;
私人摄像机参数mCameraParameters;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler=新处理程序();
mPreviewSurfaceView=(SurfaceView)findViewById(R.id.SurfaceView);
mPreviewImageView=(ImageView)findViewById(R.id.ImageView);
mPreviewSurfaceView.getHolder().addCallback(mCallback);
TextView=(TextView)findViewById(R.id.TextView);
view.setText(“格式:“+String.valueOf(TESTS_COUNT));
}
@凌驾
恢复时公开作废(){
super.onResume();
if(mCamera==null){
对于(int i=0;i测试\u计数){
Log.e(“摄像机”,“索引处的测试预览格式:”+测试计数);
参数setPreviewFormat(formats.get(TESTS_COUNT));
mCamera.setParameters(参数);
mCameraOpen=true;
SurfaceHolder holder=mPreviewSurfaceView.getHolder();
if(holder!=null&&holder.getSurface()!=null&&holder.getSurface().isValid()){
mCallback.表面处理(支架);
}
mCameraParameters=params;
打破
}否则{
完成();
}
}
}
}
}
@凌驾
公共无效暂停(){
super.onPause();
如果(mPreviewRunning){
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mPreviewRunning=错误;
}
如果(麦卡梅拉奥彭){
mCamera.release();
mCamera=null;
mCameraOpen=false;
}
}
@凌驾
公共空间{
super.ondestory();
}
private final SurfaceHolder.Callback mCallback=new SurfaceHolder.Callback(){
@凌驾
已创建的公共空隙表面(表面层表面层){
if(mCameraOpen&&mCamera!=null){
试一试{
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.setPreviewCallback(新的Camera.PreviewCallback(){
私人整数计数;
私人整数合计;
@凌驾
预览帧上的公共无效(字节[]字节,摄影机){
如果(计数=15){
Camera.Size previewSize=mCamera.getParameters().getPreviewSize();
//pWidth和pHeight定义预览帧的大小
ByteArrayOutputStream out=新建ByteArrayOutputStream();
//将此参数的第二个参数更改为您正在接收的实际格式
YuvImage yuv=新的YuvImage(字节,ImageFormat.NV21,previewSize.width,previewSize.height,null);
//bWidth和bHeight定义希望使用预览图像填充的位图的大小
yuv.compressToJpeg(新的矩形(0,0,previewSize.width,previewSize.height),50,out);
byte[]bitmapBytes=out.toByteArray();
最终位图位图=BitmapFactory.decodeByteArray(bitmapBytes,0,bitmapBytes.length);
mHandler.post(新Runnable(){
@凌驾
公开募捐{
mPreviewImageView.setImageBitmap(位图);
}
});
计数=0;
总计++;
如果(总数>5){
测试计数++;
if(TESTS_COUNT==mCameraParameters.getSupportedPreviewSizes().size()){
完成();
返回;
}
意向意向=新意向(MainActivity.this,MainActivity.class);
星触觉(意向);
}
}否则{
计数++;
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".MainActivity"
android:orientation="vertical"
android:weightSum="2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".MainActivity"
android:orientation="horizontal"
android:layout_weight="1"
android:weightSum="2">
<SurfaceView
android:layout_width="640px"
android:layout_height="480px"
android:id="@+id/surfaceview"/>
<ImageView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:id="@+id/imageview"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textview"
android:textSize="40sp"/>
</LinearLayout>
</LinearLayout>
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height)
{
if (mCameraParameters==null) return;
...
}