android 7自定义相机预览及拍照功能

本文实例为大家分享了Android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。

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); 
 
 } 
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自由互联。