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android前后摄像头切换demo，startview后的页面上有切换、拍照两个按钮，拍照后照片未保存，需要保存的请看下方注释，实现了拍照、聚焦功能，以下是CameraPreview.java源码：
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package com.myselftest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Handler;
import android.os.Message;
import android.widget.RelativeLayout;
import android.view.MotionEvent;
import android.app.Activity;
import android.view.View.OnClickListener;
import android.hardware.Camera.CameraInfo;
import android.os.SystemProperties;
import android.view.View.OnTouchListener;
import android.graphics.Rect;
import android.hardware.Camera.PictureCallback;
public class CameraPreview extends Activity implements OnClickListener, SurfaceHolder.Callback {
private static final String TAG = "CameraPreview";
private Camera mCamera;
private Camera.Parameters mCameraParam;
private int mPrvW = 800;
private int mPrvH = 600;
private final AutoFocusCallback mAutoFocusCallback = new AutoFocusCallback();
private long mFocusCallbackTime;
private FocusIndicatorView mFocusIndicatorView;
private static final int WIDTH_DP = 80;
private static final int HEIGTH_DP = 80;
private boolean focusing = false;
private boolean state;
private TextView btn_position = null;
private TextView btn_capture = null;
private SurfaceHolder holder = null;
private VideoPreview mVideoPreview;
private int cameraPosition = 1; //1,camera_back 0,camera_front
private int cameraId;
private RelativeLayout mRelativeLayout;
CameraInfo ci = null;
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_preview);
Window win = getWindow();
win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
win.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
btn_position = (TextView) findViewById(R.id.btn_position);
btn_capture = (TextView) findViewById(R.id.btn_capture);
mPrvW = this.getWindow().getWindowManager().getDefaultDisplay().getWidth();
mPrvH = mPrvW*4/3;
mFocusIndicatorView = new FocusIndicatorView(this);
int width_px = dip2px(this, WIDTH_DP);
int heigth_px = dip2px(this, HEIGTH_DP);
RelativeLayout.LayoutParams mLayoutParams = new RelativeLayout.LayoutParams(width_px, heigth_px);
int[] rules = mLayoutParams.getRules();
rules[RelativeLayout.CENTER_IN_PARENT] = 1;
mRelativeLayout = (RelativeLayout) findViewById(R.id.main_layout);
mRelativeLayout.addView(mFocusIndicatorView, mLayoutParams);
mRelativeLayout.setOnTouchListener(onTouchListener);
mVideoPreview = (VideoPreview) findViewById(R.id.camera_preview);
btn_position.setOnClickListener(this);
btn_capture.setOnClickListener(this);
}
@Override
public void onClick(View v){
if(v.equals(btn_position)){
camera_position();
}else if(v.equals(btn_capture)){
rawCapture();
}
}
@Override
protected void onResume() {
super.onResume();
mVideoPreview.setAspectRatio(mPrvW, mPrvH);
holder = mVideoPreview.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public boolean onTouchEvent(MotionEvent event) {
if(focusing == false) {
focusing = true;
mFocusIndicatorView.showStart();
mCamera.autoFocus(mAutoFocusCallback);
}
return true;
}
public class FocusIndicatorView extends View {
public FocusIndicatorView(Context context) {
super(context);
}
private void setDrawable(int resid) {
setBackgroundDrawable(getResources().getDrawable(resid));
}
public void showStart() {
setDrawable(R.drawable.ic_focus_focusing);
}
public void showSuccess() {
setDrawable(R.drawable.ic_focus_focused);
}
public void showFail() {
setDrawable(R.drawable.ic_focus_failed);
}
public void clear() {
setBackgroundDrawable(null);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.i(TAG, "surfaceChanged width is : " + width+" height is"+height+" ci.orientation="+ci.orientation);
startPreview(ci.orientation);
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
ci = new CameraInfo();
Camera.getCameraInfo(0, ci);
openCamera(0);
cameraId = 0;
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException exception) {
closeCamera();
Log.i(TAG, "surfaceCreated closeCamera ");
}
}
private void openCamera(int cmaId) {
if (mCamera == null) {
mCamera = Camera.open(cmaId);
cameraId = cmaId;
Log.i(TAG, "Enter openCamera to init the mCamera.");
if (null == mCamera) {
Log.i(TAG, "init the mCamera is null.");
}
}
}
private void closeCamera() {
if (null != mCamera) {
mCamera.release();
mCamera = null;
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
stopPreview();
closeCamera();
Log.i(TAG, "surfaceDestroyed closeCamera ");
}
private void stopPreview() {
if (null != mCamera) {
mCamera.stopPreview();
}
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
if (0 == msg.what) {
mFocusIndicatorView.clear();
}
}
};
private void startPreview(int orientation) {//orientation：当前所选摄像头的偏转角度
if (null != mCamera) {
mCameraParam = mCamera.getParameters();
}else{
return;
}
Size size = mCameraParam.getPictureSize();
List
Size optimalSize = null;
if (size != null && size.height != 0) {
optimalSize = getOptimalPreviewSize(sizes, (double) mPrvH / mPrvW);
}
if (optimalSize != null) {
mCameraParam.setPreviewSize(optimalSize.width, optimalSize.height);
} else {
mCameraParam.setPreviewSize(mPrvW, mPrvH);
}
mCameraParam.set("fps-mode", 0); // Frame rate is normal
mCameraParam.set("cam-mode", 0); // Cam mode is preview
if (cameraPosition == 1) {
mCameraParam.setFocusMode(mCameraParam.FOCUS_MODE_CONTINUOUS_PICTURE);
mCameraParam.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
}
mCamera.setDisplayOrientation(orientation);
mCamera.setParameters(mCameraParam);
mCamera.startPreview();
mCamera.autoFocus(mAutoFocusCallback);
}
private Size getOptimalPreviewSize(List
final double ASPECT_TOLERANCE = 0.05;
if (sizes == null) {
return null;
}
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
Display display = getWindowManager().getDefaultDisplay();
int targetHeight = Math.min(display.getHeight(), display.getWidth());
if (targetHeight <= 0) {
WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
targetHeight = windowManager.getDefaultDisplay().getHeight();
}
Log.d(TAG, "getOptimalPreviewSize() sizes.size = " + sizes.size());
int i = 1;
for (Size size : sizes) {
double ratio = (double) size.width / size.height;
i++;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) {
continue;
}
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
Log.d(TAG, "No preview size match the aspect ratio");
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
} else {
Log.d(TAG, String.format("Optimal preview size is %sx%s", optimalSize.width, optimalSize.height));
}
return optimalSize;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
return true;
case KeyEvent.KEYCODE_SEARCH:
return true;
case KeyEvent.KEYCODE_FOCUS:
return true;
case KeyEvent.KEYCODE_BACK:
break;
}
return super.onKeyDown(keyCode, event);
}
private void camera_position(){
CameraInfo cameraInfo = new CameraInfo();
int cameraCount = Camera.getNumberOfCameras();
for(int i = 0; i Camera.getCameraInfo(i, cameraInfo); Log.d(TAG, "cameraOrientation-"+i+":"+cameraInfo.orientation); if(cameraPosition == 0){ if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK){ stopPreview(); closeCamera(); openCamera(i); cameraPosition = 1; if (null != mCamera) { try { mCamera.setPreviewDisplay(holder); } catch (IOException ex) { closeCamera(); Log.i(TAG, "camera_position closeCamera "+i); ex.printStackTrace(); } startPreview(cameraInfo.orientation); } break; } }else{ if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){ stopPreview(); closeCamera(); openCamera(i); cameraPosition = 0; if (null != mCamera) { try { mCamera.setPreviewDisplay(holder); } catch (IOException ex) { closeCamera(); Log.i(TAG, "camera_position closeCamera "+i); ex.printStackTrace(); } startPreview(90); } break; } } } } private void rawCapture() { if(mCamera != null){ try { mCamera.startPreview(); mCamera.autoFocus(mAutoFocusCallback); mCamera.takePicture(null, null, new JpegPictureCallback()); Toast.makeText(this, getString(R.string.cma_capture_success), Toast.LENGTH_LONG).show(); mCamera.stopPreview(); mCamera.setPreviewDisplay(holder); mCamera.startPreview(); }catch(Exception ex){ closeCamera(); ex.printStackTrace(); } Log.i(TAG, "rawCapture function end"); } } private final class AutoFocusCallback implements android.hardware.Camera.AutoFocusCallback { public void onAutoFocus(boolean focused, android.hardware.Camera camera) { mFocusCallbackTime = System.currentTimeMillis(); Log.i(TAG, "mFocusCallbackTime is " + mFocusCallbackTime); if(focused && !state) { mFocusIndicatorView.showSuccess(); mHandler.sendEmptyMessageDelayed(0, 1500); } else if(!focused){ mHandler.removeMessages(0); mFocusIndicatorView.showFail(); } focusing = false; state = focused; } } private final class JpegPictureCallback implements PictureCallback { public void onPictureTaken(byte[] jpegData, android.hardware.Camera camera) { Log.d(TAG, "mJpegPictureCallbackTime = " + System.currentTimeMillis()); if (jpegData != null) { storeImage(jpegData); } } } private void storeImage(byte[] jpegData) {//本例未保存所拍照片，如需要保存，请取消下方的注释 String name = "factorymode_test.jpg"; // File fHandle = new File(name); // try { // OutputStream bos = new FileOutputStream(fHandle); // bos.write(jpegData); // bos.close(); // long storeImageTime = System.currentTimeMillis(); // Log.d(TAG, "storeImageTime = " + storeImageTime); // } catch (Exception ex) { // fHandle.delete(); // } } OnTouchListener onTouchListener = new OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event){ mFocusIndicatorView.setX(event.getX()); mFocusIndicatorView.setY(event.getY()); if(event.getAction() == MotionEvent.ACTION_DOWN){ mFocusIndicatorView.showSuccess(); }else if(event.getAction() == MotionEvent.ACTION_UP){ mFocusIndicatorView.showFail(); if(cameraPosition == 1){ focusOnTouch(event); } } return true; } }; private void focusOnTouch(MotionEvent event){ int [] location = new int[2]; mRelativeLayout.getLocationOnScreen(location); Rect focusRect = calculateTapArea(mVideoPreview.getWidth(), mVideoPreview.getHeight(), 1f, event.getRawX(), event.getRawY(), location[0], location[0] + mRelativeLayout.getWidth(), location[1], location[1] + mRelativeLayout.getHeight()); Rect meteringRect = calculateTapArea(mVideoPreview.getWidth(), mVideoPreview.getHeight(), 1.5f, event.getRawX(), event.getRawY(), location[0], location[0] + mRelativeLayout.getWidth(), location[1], location[1] + mRelativeLayout.getHeight()); mCameraParam.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO); if(mCameraParam.getMaxNumFocusAreas() > 0){ List focusAreas.add(new Camera.Area(focusRect, 1000)); mCameraParam.setFocusAreas(focusAreas); } if(mCameraParam.getMaxNumMeteringAreas() > 0){ List meteringAreas.add(new Camera.Area(meteringRect, 1000)); mCameraParam.setMeteringAreas(meteringAreas); } if(mCamera != null){ mCamera.setParameters(mCameraParam); } mCamera.autoFocus(mAutoFocusCallback); } private Rect calculateTapArea(int focusWidth, int focusHeight, float areaMultiple, float x, float y, int previewLeft, int previewRight, int preViewTop, int preViewBottom){ int areaWidth = (int)(focusWidth * areaMultiple); int areaHeight = (int)(focusHeight * areaMultiple); int centerX = (previewLeft + previewRight) / 2; int centerY = (preViewTop + preViewBottom) / 2; double unitx = (((double)previewRight - (double)previewLeft)) /2000; double unity = (((double)preViewBottom - (double)preViewTop)) /2000; int left = clamp((int)(((x - areaWidth / 2) - centerX) / unitx), -1000, 1000); int top = clamp((int)(((y - areaHeight / 2) - centerY) / unity), -1000, 1000); int right = clamp((int)(left + areaWidth / unitx), -1000, 1000); int bottom = clamp((int)(top + areaHeight / unity), -1000, 1000); return new Rect(left, top, right, bottom); } private int clamp(int x, int min, int max){ if(x > max){ return max; } if(x < min){ return min; } return x; } } camera_preview.xml布局文件： xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/main_layout" android:orientation="vertical"> android:id="@+id/camera_preview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centerInParent="true"/> android:id="@+id/btn_capture" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_marginRight="33dp" android:gravity="center" android:text="@string/cma_capture" /> android:id="@+id/btn_position" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_marginLeft="48dp" android:gravity="center" android:text="@string/cma_position" /> 以上代码在android6.0上测试通过。
文章题目：android前后摄像头切换
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