我是android新手， 我的应用程序在较少（相机）分辨率的手机中工作正常，但如果我的应用程序用于高（相机）像素移动，它挂起，如果我使用它几次（4到5）。我的问题是我们可以创建相机代码，以便我表现得像分辨率较低的相机？
我用于相机的代码。
//摄像头代码
public void openCamera() {
if (Helper.checkCameraHardware(this)) {
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateFileName = sdf.format(new Date());
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyyMMddHHmmss");
String curentDateandTime = sdf1.format(new Date());
File sdImageMainDirectory = new File(Environment
.getExternalStorageDirectory().getPath()
+ "/"
+ Helper.IMG_FOLDER + "/" + dateFileName);
if (!sdImageMainDirectory.exists()) {
sdImageMainDirectory.mkdirs();
}
String PATH = Environment.getExternalStorageDirectory()
.getPath()
+ "/"
+ Helper.IMG_FOLDER
+ "/"
+ dateFileName + "/";
// PATH = PATH OF DIRECTORY,image_PATH = full path of IMAGE
image_PATH = PATH + curentDateandTime + ".jpg";
System.out.println("image_PATH In open camera" + image_PATH);
Log.d("Camera", "File exist at in OC" + image_PATH + " <<");
File file = new File(PATH, curentDateandTime + ".jpg");
Uri outputFileUri = Uri.fromFile(file);
Intent i = new Intent("android.media.action.IMAGE_CAPTURE");
i.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(i, 1234);
} catch (Exception e) {
Helper.AlertBox(this,
"Error No: 001\nPlease contact Bluefrog technical person.\n"
+ e.toString());
}
} else {
// Helper.AlertBox(this, "Camera Not Found.!");
Helper.AlertBox(this, "Image Not Captured !");
image_PATH = "";
SENDING_IMAGE_PATH = "";
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// image_PATH = "";
image_str = "";
// super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1234) {
if (resultCode == RESULT_OK) {
// restorePreferences();
Log.e("image_PATH in OnActivityResultSet", "File exist at "
+ image_PATH);
Log.d("Camera", "File exist at " + image_PATH + " <<");
File file = new File(image_PATH);
if (file.exists()) {
Log.e("File exist condition :", "File exist at "
+ image_PATH);
try {
iv_MEPhoto.setImageBitmap(Helper.getImage(file
.getPath()));
iv_MEPhoto.setVisibility(View.VISIBLE);
photoTaken = true;
SENDING_IMAGE_PATH = image_PATH;
Log.e("File exist condition :", "File exist at "
+ image_PATH);
} catch (Exception e) {
Helper.AlertBox(this,
"Error No: 004\nPlease contact Bluefrog technical person.\n"
+ e.toString());
Log.e("Error reading file", e.toString());
}
} else {
image_PATH = "";
SENDING_IMAGE_PATH = "";
Helper.AlertBox(this,
"Error No: 005\nPlease contact Bluefrog technical person.");
}
} else {
Helper.AlertBox(this, "Image Not Captured.");
image_PATH = "";
SENDING_IMAGE_PATH = "";
}
}
}
// camera code end
// in HELPER cLASS reqWidth = 320 ,reqHeight =240
public static Bitmap getImage(String filePath) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
bmp = Bitmap.createScaledBitmap(bmp, reqWidth, reqHeight, true);
return bmp;
}
public static String getImageString(String filePath) {
String imageString = "";
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
bmp = Bitmap.createScaledBitmap(bmp, reqWidth, reqHeight, true);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 70, baos); // bm is the bitmap
// object
byte[] byte_arr = baos.toByteArray();
imageString = Base64.encodeBytes(byte_arr);
return imageString;
}
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
答案 0 :(得分：0)
为了让你拥有自己的Android应用程序，你需要这些权限
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
在你的活动应该包括
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Toast;
public class GeoCamera extends Activity implements SurfaceHolder.Callback,
OnClickListener {
static final int FOTO_MODE = 0;
private SurfaceView surefaceView;
private SurfaceHolder surefaceHolder;
private Camera camera;
private boolean previewRunning = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// load the layout
setContentView(R.layout.main);
surefaceView = (SurfaceView) findViewById(R.id.surface_camera);
surefaceView.setOnClickListener(this);
surefaceHolder = surefaceView.getHolder();
surefaceHolder.addCallback(this);
surefaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
/*
* initiate auto focus
*/
AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean arg0, Camera arg1) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
"'It is ready to take the photograph !!!",
Toast.LENGTH_SHORT).show();
}
};
Camera.PictureCallback pictureCallBack = new Camera.PictureCallback() {
/*
* (non-Javadoc)
*
* @see android.hardware.Camera.PictureCallback#onPictureTaken(byte[],
* android.hardware.Camera) create new intent and store the image
*/
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
if (data != null) {
Intent imgIntent = new Intent();
storeByteImage(data);
camera.startPreview();
setResult(FOTO_MODE, imgIntent);
}
}
};
/*
* called when image is stored
*/
public boolean storeByteImage(byte[] data) {
// Create the <timestamp>.jpg file and modify the exif data
String filename = "/sdcard"
+ String.format("/%d.jpg", System.currentTimeMillis());
try {
FileOutputStream fileOutputStream = new FileOutputStream(filename);
try {
fileOutputStream.write(data);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
fileOutputStream.flush();
fileOutputStream.close();
return true;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
/*
* (non-Javadoc)
*
* @see android.view.View.OnClickListener#onClick(android.view.View) called
* when clicked on the surface
*/
public void onClick(View v) {
// TODO Auto-generated method stub
camera.takePicture(null, pictureCallBack, pictureCallBack);
}
/*
* (non-Javadoc)
*
* @see
* android.view.SurfaceHolder.Callback#surfaceChanged(android.view.SurfaceHolder
* , int, int, int)
*/
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if (previewRunning) {
cam.stopPreview();
}
Camera.Parameters parameters = cam.getParameters();
List<Camera.Size> sizes = parameters.getSupportedPictureSizes();
height = sizes.get(0).height;
width = sizes.get(0).width;
parameters.setPictureSize(width, height);
Display display = ((WindowManager) getSystemService(WINDOW_SERVICE))
.getDefaultDisplay();
if (display.getRotation() == Surface.ROTATION_0) {
parameters.setPreviewSize(width, height);
cam.setDisplayOrientation(90);
}
cam.setParameters(parameters);
try {
cam.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
cam.startPreview();
previewRunning = true;
}
/*
* (non-Javadoc)
*
* @see
* android.view.SurfaceHolder.Callback#surfaceCreated(android.view.SurfaceHolder
* )
*/
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open();
}
/*
* (non-Javadoc)
*
* @see android.view.SurfaceHolder.Callback#surfaceDestroyed(android.view.
* SurfaceHolder) Called when it release the camera resource
*/
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
previewRunning = false;
camera.release();
}
}
布局应包括
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent" android:layout_height="10dip"
android:layout_weight="1">
</SurfaceView>
您可以设置您选择的相机参数以获取更多详细信息：http://developer.android.com/reference/android/hardware/Camera.Parameters.html