我正在尝试各种方式为Android制作相机应用。我尝试了很多指南（还有很多关于这个问题的答案），但是在每一个指导之后，似乎都没有任何指导。
我也尝试了Google文档，但它没有用，无论如何我在AndroidManifest.xml中拥有所有必需的权限
这是我的最后一次尝试
package com.ithoughtugnu.photoxor;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
public class Custom_CameraActivity extends Activity implements
SurfaceHolder.Callback {
/* VARIABILI PRIVATE */
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
private boolean mPreviewRunning;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_custom_camera);
addListenerOnButton();
getWindow().setFormat(PixelFormat.TRANSLUCENT); // aggiungo il
// traslucido
requestWindowFeature(Window.FEATURE_NO_TITLE); // no barra titolo
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN); // full screen
mSurfaceView = (SurfaceView) findViewById(R.id.camera_surface);
mSurfaceHolder = mSurfaceView.getHolder(); // recupero l'holder della
// SurfaceView
mSurfaceHolder.addCallback(this); // faccio la bind con la nostra
// activity
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void addListenerOnButton() {
ImageView buttonPicture = (ImageView) findViewById(R.id.imageView1);
buttonPicture.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mCamera.takePicture(null, null, jpegCallback);
}
});
}
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] _data, Camera _camera) {
// riparte la preview della camera
mCamera.startPreview();
}
};
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
if (mPreviewRunning)
mCamera.stopPreview();
// setto le preferenze
Camera.Parameters p = mCamera.getParameters(); // prendo le preferenze
// della camera
p.setPreviewSize(arg2, arg3);
ArrayList<Size> list = (ArrayList<Size>) p.getSupportedPictureSizes();
int picture_width = list.get(list.size() - 1).width;
int picture_height = list.get(list.size() - 1).height;
p.setPictureSize(picture_width, picture_height);
p.setJpegQuality(80); // qualità compressione JPEG
// salvo le pref
mCamera.setParameters(p);
try {
// lancio la preview
mCamera.setPreviewDisplay(arg0);
mCamera.startPreview();
mPreviewRunning = true;
} catch (IOException e) {
// gestione errore
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
}
}
activity_custom_camera.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:orientation="vertical" >
<!-- <FrameLayout
android:id="@+id/camera_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" /> -->
<SurfaceView android:id="@+id/camera_surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
</SurfaceView>
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="16dp"
android:clickable="true"
android:contentDescription="@string/capture"
android:onClick="captureImageClick"
android:src="@drawable/capture" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="18dp"
android:layout_marginTop="18dp"
android:contentDescription="@string/change_camera"
android:src="@drawable/revert" />
<ImageView
android:id="@+id/imageSettings"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/imageView2"
android:layout_marginRight="18dp"
android:contentDescription="@string/settings"
android:src="@drawable/settings_icon2" />
<ImageView
android:id="@+id/imageGallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageView2"
android:layout_alignTop="@+id/imageView1"
android:contentDescription="@string/gallery"
android:src="@drawable/gallery2" />
<ImageView
android:id="@+id/imageEffects"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_alignRight="@+id/imageSettings"
android:contentDescription="@string/effects"
android:src="@drawable/effects" />
</RelativeLayout>
我没有看到Camera Perspective，如果按下按钮Capture我在Logcat中收到了这些错误
02-22 01:07:39.567: W/Camera(8264): Camera server died!
02-22 01:07:39.567: W/Camera(8264): ICamera died
02-22 01:07:39.577: E/Camera(8264): Error 100
如果我再次执行1-2次，我会在Logcat和应用程序崩溃中收到大量红色消息。 对于我尝试的每个教程都会发生这种情况，我不知道为什么。
N.B。我正在使用三星Galaxy S Advance，但我在Nexus 5和应用程序崩溃时也试过它，然后让我有可能按下捕获按钮。 我该如何解决这个问题？
答案 0 :(得分：0)
这里有几条建议。
Camera.open() Activity / Fragment方法onResume()
以下是我的示例代码似乎正在处理并使用上述建议。检查特别是表面方法似乎是混合表面方法的工作。
public class NewItemCameraFragment extends Fragment{
private static final String TAG_STRING = NewItemCameraFragment.class.toString();
private Camera mCamera;
private SurfaceView mSurfaceView;
private Button mTakeButton;
private FrameLayout mProgressLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_item_camera, null, false);
mProgressLayout = (FrameLayout) view.findViewById(R.id.item_camera_progress);
mProgressLayout.setVisibility(View.INVISIBLE);
mTakeButton = (Button) view.findViewById(R.id.item_camera_button);
mTakeButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mCamera != null) {
mCamera.takePicture(mShutterCallback, null, mPictureCallback);
}
}
});
mSurfaceView = (SurfaceView) view.findViewById(R.id.item_camera_surfaceview);
SurfaceHolder holder = mSurfaceView.getHolder();
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.addCallback(new Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
if (mCamera != null) {
mCamera.stopPreview();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
if (mCamera != null) {
try {
mCamera.setPreviewDisplay(holder);
mCamera.setDisplayOrientation(90);
} catch (IOException e) {
// TODO Auto-generated catch block
Log.d(TAG_STRING, "Error setting up preview display " + e);
}
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if (mCamera == null) return;
Camera.Parameters parameters = mCamera.getParameters();
Size s = getBestSupportedSize(parameters.getSupportedPreviewSizes(), width, height);
parameters.setPreviewSize(s.width, s.height);
s = getBestSupportedSize(parameters.getSupportedPreviewSizes(), width, height);
parameters.setPictureSize(s.width, s.height);
mCamera.setParameters(parameters);
try {
mCamera.startPreview();
} catch (Exception e) {
Log.d(TAG_STRING, "Could not start the preview " + e);
mCamera.release();
mCamera = null;
}
}
});
return view;
}
private Camera.ShutterCallback mShutterCallback = new ShutterCallback() {
@Override
public void onShutter() {
mProgressLayout.setVisibility(View.VISIBLE);
}
};
private Camera.PictureCallback mPictureCallback = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
String filename = UUID.randomUUID().toString() + ".jpg";
FileOutputStream fos = null;
boolean success = true;
try {
fos = getActivity().openFileOutput(filename, Context.MODE_PRIVATE);
fos.write(data);
} catch (Exception e) {
Log.d(TAG_STRING, "Error writing to file " + e);
} finally {
try {
if (fos != null) fos.close();
} catch (IOException e) {
e.printStackTrace();
success = false;
}
}
if (success) { Log.i(TAG_STRING, "File saved at " + filename); }
getActivity().finish();
}
};
private Size getBestSupportedSize(List<Size> sizes, int width, int height) {
Size bestSize = sizes.get(0);
int largestArea = bestSize.width * bestSize.height;
for (Size size : sizes) {
int area = size.width * size.height;
if (largestArea < area) {
bestSize = size;
largestArea = area;
}
}
return bestSize;
}
@Override
public void onResume() {
super.onResume();
mCamera = Camera.open();
}
@Override
public void onPause() {
super.onPause();
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
}
更新了布局以清除问题。
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<SurfaceView
android:id="@+id/item_camera_surfaceview"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_weight="1"/>
<Button
android:id="@+id/item_camera_button"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="@string/item_camera_button_text"/>
</LinearLayout>
<FrameLayout
android:id="@+id/item_camera_progress"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true">
<ProgressBar
style="@android:style/Widget.ProgressBar.Large"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center"/>
</FrameLayout>
</FrameLayout>