适配android 7的自定义相机的预览及拍照
来源：互联网 发布：知党规 行敬畏 编辑：程序博客网 时间：2024/04/30 10:50
import android.Manifest;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.graphics.PixelFormat;import android.hardware.Camera;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.support.v4.app.ActivityCompat;import android.util.Log;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.WindowManager;import android.widget.TextView;import com.hama.tracker.R;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class CamaraActivity extends Activity implements View.OnClickListener { @Bind(R.id.return_back) TextView returnBack; @Bind(R.id.tvswitch_camera) TextView tvswitchCamera; //启动摄像机 private Camera mCamera; public boolean isopen_camara = false; private SurfaceView surfaceView; private SurfaceHolder mholder = null; private SurfaceCallback previewCallBack; private boolean isTakingPhoto;//是否正在拍照 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); verifyPermission(new String[]{Manifest.permission.CAMERA}); // getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_camara); ButterKnife.bind(this); // 预览控件 surfaceView = (SurfaceView) this .findViewById(R.id.surfaceView); // 设置参数 surfaceView.getHolder().setKeepScreenOn(true); surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); returnBack.setOnClickListener(this); tvswitchCamera.setOnClickListener(this); EventBus.getDefault().register(this); } public void verifyPermission(String[] permissions) { if (permissions != null) { List<String> lists = new ArrayList<>(); for (int i = 0; i < permissions.length; i++) { if (ActivityCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) { if (ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[i])) { } lists.add(permissions[i]); } } if (lists.size() > 0) { String[] ps = new String[lists.size()]; for (int i = 0; i < lists.size(); i++) { ps[i] = lists.get(i); } ActivityCompat.requestPermissions(this, ps, 1); } } } @Override protected void onRestart() { super.onRestart(); } @Override protected void onStart() { super.onStart(); } private void takePhoto() { if (!isopen_camara) { previewCallBack = new SurfaceCallback(); surfaceView.getHolder().addCallback(previewCallBack); } else { autoTakePhoto(); } } @Override protected void onResume() { super.onResume(); if(mCamera == null){ if (!isopen_camara) { previewCallBack = new SurfaceCallback(); surfaceView.getHolder().addCallback(previewCallBack); } } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.return_back: finish(); break; case R.id.tvswitch_camera: switchCamara(); break; } } // 预览界面回调 private final class SurfaceCallback implements SurfaceHolder.Callback { // 预览界面被创建 public void surfaceCreated(SurfaceHolder holder) { try { //1代表打开后置摄像头,0代表打开前置摄像头. mCamera = Camera.open(cameraPosition);// 打开摄像头 setParams(holder,cameraPosition); } catch (Exception e) { e.printStackTrace(); if (mCamera != null) { mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } finish(); //Toast.makeText(getApplicationContext(), "该手机不支持自动拍照功能", Toast.LENGTH_LONG).show(); } } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { System.out.println("surfaceChanged"); isopen_camara = true; //autoTakePhoto(); } // 预览界面被销毁 public void surfaceDestroyed(SurfaceHolder holder) { System.out.println("surfaceDestroyed"); if(!isopen_camara) return; if (mCamera != null) { holder.removeCallback(this); mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } } } public void reset(){ Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); if (mCamera != null) { if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; mCamera = Camera.open(cameraPosition); if (null != mholder) setParams(mholder,cameraInfo.facing); } } @Override protected void onDestroy() { super.onDestroy(); if (mCamera != null) { if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.lock(); mCamera.release(); mCamera = null; } ButterKnife.unbind(this); EventBus.getDefault().unregister(this); } private void setParams(SurfaceHolder mySurfaceView,int postion) { try { int PreviewWidth = 0; int PreviewHeight = 0; WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);//获取窗口的管理器 /*PreviewWidth = display.(); PreviewHeight = display.getHeight();*/ Camera.Parameters parameters = mCamera.getParameters(); // 选择合适的预览尺寸 List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes(); // 如果sizeList只有一个我们也没有必要做什么了，因为就他一个别无选择 if (sizeList.size() > 1) { Iterator<Camera.Size> itor = sizeList.iterator(); while (itor.hasNext()) { Camera.Size cur = itor.next(); /*if (cur.width >= PreviewWidth && cur.height >= PreviewHeight) {*/ if (cur.width >= PreviewWidth && cur.height >= PreviewHeight) { PreviewWidth = cur.width; PreviewHeight = cur.height; break; } } } parameters.setPreviewSize(PreviewWidth, PreviewHeight); //获得摄像区域的大小 //parameters.setPreviewFrameRate(3);//每秒3帧 每秒从摄像头里面获得3个画面 //parameters.setPreviewFpsRange(3,); List<int[]> list = parameters.getSupportedPreviewFpsRange(); int[] v = null; int index = 0; int min = 0; for (int i = 0; i < list.size(); i++) { v = list.get(i); if (v[0] > min) { min = v[0]; index = i; } } parameters.setPreviewFpsRange(list.get(index)[0], list.get(index)[1]); parameters.setPictureFormat(PixelFormat.JPEG);//设置照片输出的格式 parameters.set("jpeg-quality", 85);//设置照片质量 parameters.setPictureSize(PreviewWidth, PreviewHeight);//设置拍出来的屏幕大小 parameters.setRotation(180); //Java部分 if (Build.VERSION.SDK_INT >= 24) { if(postion == 0){ mCamera.setDisplayOrientation(90); }else { mCamera.setDisplayOrientation(270); } } else { mCamera.setDisplayOrientation(90); } mCamera.setParameters(parameters);//把上面的设置 赋给摄像头 mCamera.setPreviewDisplay(mySurfaceView);//把摄像头获得画面显示在SurfaceView控件里面 mholder = mySurfaceView; mCamera.setPreviewCallback(new Camera.PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { } }); mCamera.startPreview();//开始预览 // mPreviewRunning = true; } catch (IOException e) { Log.e("tag", e.toString()); } } Handler handler = null; private void autoTakePhoto() { // 拍照前需要对焦 获取清析的图片 if (null == mCamera) return; mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { if (success && isopen_camara) { // 对焦成功 // Toast.makeText(MainActivity.this, "对焦成功 !!",Toast.LENGTH_SHORT).show(); if(!isTakingPhoto) { isTakingPhoto = true; handler = new Handler(); handler.post(new Runnable() { @Override public void run() { mCamera.takePicture(null, null, new MyPictureCallback()); } }); } } } }); } // 照片回调 private final class MyPictureCallback implements Camera.PictureCallback { // 照片生成后 @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); Matrix matrix = new Matrix(); matrix.setRotate(270); File jpgFile = new File(Environment.getExternalStorageDirectory() + "/DCIM/camera"); if (!jpgFile.exists()) { jpgFile.mkdir(); } File jpgFile1 = new File(jpgFile.getAbsoluteFile(), System.currentTimeMillis() + ".jpg"); bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); FileOutputStream fos = new FileOutputStream(jpgFile1); bitmap.compress(Bitmap.CompressFormat.JPEG, 80, fos); ToastUtils.show(getApplicationContext(), getString(R.string.save_success)); fos.close(); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.fromFile(jpgFile1); intent.setData(uri); sendBroadcast(intent); } catch (Exception e) { e.printStackTrace(); }finally { if(Build.VERSION.SDK_INT>=24){ reset(); } isTakingPhoto = false; } } } private int cameraPosition = 1;//0代表前置摄像头，1代表后置摄像头 private void switchCamara() { //切换前后摄像头 int cameraCount = 0; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数 for (int i = 0; i < cameraCount; i++) { Camera.getCameraInfo(i, cameraInfo);//得到每一个摄像头的信息 if (cameraPosition == 1) { //现在是后置，变更为前置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置 if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview();//停掉原来摄像头的预览 mCamera.lock(); mCamera.release();//释放资源 mCamera = null;//取消原来摄像头 mCamera = Camera.open(i);//打开当前选中的摄像头 /* try { if (null != mholder) mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面 } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mCamera.startPreview();//开始预览*/ if (null != mholder) setParams(mholder,Camera.CameraInfo.CAMERA_FACING_BACK); cameraPosition = 0; break; } } else { //现在是前置， 变更为后置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {//代表摄像头的方位，CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置 if(surfaceView != null && surfaceView.getHolder() != null && previewCallBack != null){ surfaceView.getHolder().removeCallback(previewCallBack); } mCamera.setPreviewCallback(null); mCamera.stopPreview();//停掉原来摄像头的预览 mCamera.lock(); mCamera.release();//释放资源 mCamera = null;//取消原来摄像头 mCamera = Camera.open(i);//打开当前选中的摄像头 /*try { if (null != mholder) mCamera.setPreviewDisplay(mholder);//通过surfaceview显示取景画面 } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mCamera.startPreview();//开始预览*/ if (null != mholder) setParams(mholder,Camera.CameraInfo.CAMERA_FACING_FRONT); cameraPosition = 1; break; } } } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {///音量减拍照 takePhoto(); return true; } return super.onKeyDown(keyCode, event); }}上述代码实现摄像头切换，拍照及保存到相册，预览等功能，解决android7拍照之后不能连续预览的问题、参数设置相关问题以及前后摄像头语言颠倒等问题
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