Android自定义相机,切换前后摄像头,照相机拍照
16lz
2021-01-23
Android自定义相机,简单实现切换前后摄像头,照相机拍照
Ctrl +C Ctrl+V 可以直接 run 起来,注释比较详细;源码下载
<?xml version="1.0" encoding="utf-8"?>
android6.0及以上需要 动态申请相机权限:
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 1); }
package com.tomorrow_p.camera_p;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.Surface;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.Toast;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;public class MainActivity extends Activity { private static final String TAG = "ansen"; private View mRelativeLayout; private Camera mCamera; private Camera.Parameters mParameters = null; private int cameraPosition = 1;//0代表前置摄像头,1代表后置摄像头 private SurfaceHolder mHolder; Bundle bundle = null; // 声明一个Bundle对象,用来存储数据 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);// requestWindowFeature(Window.FEATURE_NO_TITLE);//没有标题// this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏// this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//拍照过程屏幕一直处于高亮 setContentView(R.layout.activity_main); mRelativeLayout = findViewById(R.id.relativeLayout); SurfaceView surfaceView = (SurfaceView) findViewById(R.id.surfaceView); surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceView.getHolder().setFixedSize(176, 144); //设置Surface分辨率 surfaceView.getHolder().setKeepScreenOn(true);// 屏幕常亮 surfaceView.getHolder().addCallback(new SurfaceCallback());//为SurfaceView的句柄添加一个回调函数 } public void takePhoto(View v) { if (mCamera != null) { // 获取到拍照的图片数据后回调PictureCallback,PictureCallback可以对相片进行保存或传入网络 mCamera.takePicture(null, null, new MyPictureCallback()); } } public void change(View v) { //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_FRONT) {//代表摄像头的方位,CAMERA_FACING_FRONT前置 CAMERA_FACING_BACK后置 mCamera.stopPreview();//停掉原来摄像头的预览 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 { mCamera.setPreviewDisplay(mHolder);//通过surfaceview显示取景画面 } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview();//开始预览 cameraPosition = 0; break; } } else { //现在是前置, 变更为后置 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 mCamera.stopPreview();//停掉原来摄像头的预览 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 { 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 cameraPosition = 1; break; } } } } /** * 图片被点击触发的时间 * * @param v */ public void imageClick(View v) { if (bundle == null) { Toast.makeText(getApplicationContext(), "没有数据", Toast.LENGTH_SHORT).show(); } else { Intent intent = new Intent(this, PreviewImageActivity.class); intent.putExtras(bundle); startActivity(intent); } } private final class MyPictureCallback implements Camera.PictureCallback { @Override public void onPictureTaken(byte[] data, Camera camera) { try { bundle = new Bundle(); bundle.putByteArray("bytes", data); //将图片字节数据保存在bundle当中,实现数据交换 saveToSDCard(data); // 保存图片到sd卡中 Toast.makeText(getApplicationContext(), "success", Toast.LENGTH_SHORT).show();// camera.startPreview(); // 拍完照后,重新开始预览 } catch (Exception e) { e.printStackTrace(); } } } public void saveToSDCard(byte[] data) throws IOException { Log.d(TAG, "saveToSDCard"); Date date = new Date(); SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 格式化时间 String filename = format.format(date) + ".jpg"; File fileFolder = new File(Environment.getExternalStorageDirectory() + "/ansen/");// Environment.getRootDirectory() if (!fileFolder.exists()) { fileFolder.mkdir(); } File jpgFile = new File(fileFolder, filename); FileOutputStream outputStream = new FileOutputStream(jpgFile); // 文件输出流 outputStream.write(data); outputStream.close(); mCamera.startPreview(); // 拍完照后,重新开始预览 if (false) { Bitmap b = byteToBitmap(data); // 获取手机屏幕的宽高 WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE); int windowWidth = windowManager.getDefaultDisplay().getWidth(); int windowHight = windowManager.getDefaultDisplay().getHeight(); Bitmap bitmap = Bitmap.createBitmap(b, 0, 0, windowWidth, windowHight); // 图片压缩 bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream); outputStream.flush(); } } /** * 把图片byte流转换成bitmap */ private Bitmap byteToBitmap(byte[] data) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; Bitmap b = BitmapFactory.decodeByteArray(data, 0, data.length, options); int i = 0; while (true) { if ((options.outWidth >> i <= 1000) && (options.outHeight >> i <= 1000)) { options.inSampleSize = (int) Math.pow(2.0D, i); options.inJustDecodeBounds = false; b = BitmapFactory.decodeByteArray(data, 0, data.length, options); break; } i += 1; } return b; } /** * 显示surfaceView 数据的接口 */ private class SurfaceCallback implements SurfaceHolder.Callback { @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Log.d(TAG, "surfaceChanged"); mParameters = mCamera.getParameters(); // 获取各项参数 mParameters.setPictureFormat(PixelFormat.JPEG); // 设置图片格式 mParameters.setPreviewSize(width, height); // 设置预览大小 mParameters.setPreviewFrameRate(5); //设置每秒显示4帧 mParameters.setPictureSize(width, height); // 设置保存的图片尺寸 mParameters.setJpegQuality(80); // 设置照片质量 } @Override public void surfaceCreated(SurfaceHolder holder) { Log.d(TAG, "surfaceCreated"); mHolder = holder;// SurfaceHolder是系统提供用来设置surfaceView的对象 try { mCamera = Camera.open(); // 打开摄像头 mCamera.setPreviewDisplay(holder); //通过surfaceview显示取景画面 mCamera.setDisplayOrientation(getPreviewDegree(MainActivity.this));// 设置相机的方向 mCamera.startPreview(); // 开始预览 } catch (Exception e) { e.printStackTrace(); Log.e(TAG, "surfaceCreated >> Exception: " + e.getMessage()); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { Log.d(TAG, "surfaceDestroyed"); if (mCamera != null) { mCamera.release(); // 释放照相机 mCamera = null; } } } /** * 点击手机屏幕是,显示两个按钮 */ @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mRelativeLayout.setVisibility(ViewGroup.VISIBLE); // 设置视图可见 break; } return true; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_CAMERA: if (mCamera != null && event.getRepeatCount() == 0) { // 获取到拍照的图片数据后回调PictureCallback,PictureCallback可以对相片进行保存或传入网络 mCamera.takePicture(null, null, new MyPictureCallback()); } } return super.onKeyDown(keyCode, event); } // 用于根据手机方向获得相机预览画面旋转的角度 public static int getPreviewDegree(Activity activity) { int degree = 0; // 获得手机的方向 int rotation = activity.getWindowManager().getDefaultDisplay().getRotation(); Log.d(TAG, "rotation : " + rotation); // 根据手机的方向计算相机预览画面应该选择的角度 switch (rotation) { case Surface.ROTATION_0: degree = 90; break; case Surface.ROTATION_90: degree = 0; break; case Surface.ROTATION_180: degree = 270; break; case Surface.ROTATION_270: degree = 180; break; } return degree; }}
<?xml version="1.0" encoding="utf-8"?>
package com.tomorrow_p.camera_p;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.os.Bundle;import android.widget.ImageView;public class PreviewImageActivity extends Activity { private ImageView ivPic = null; // 显示图片控件 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.preview_image); ivPic = (ImageView) findViewById(R.id.imageView); setImageBitmap(getImageFormBundle()); } public void setImageBitmap(byte[] bytes) { Bitmap cameraBitmap = byte2Bitmap(); // 根据拍摄的方向旋转图像(纵向拍摄时要需要将图像选择90度) Matrix matrix = new Matrix(); matrix.setRotate(MainActivity.getPreviewDegree(this)); cameraBitmap = Bitmap .createBitmap(cameraBitmap, 0, 0, cameraBitmap.getWidth(), cameraBitmap.getHeight(), matrix, true); ivPic.setImageBitmap(cameraBitmap); } public byte[] getImageFormBundle() { Intent intent = getIntent(); Bundle data = intent.getExtras(); byte[] bytes = data.getByteArray("bytes"); return bytes; } /** * 将字节数组的图形数据转换为Bitmap */ private Bitmap byte2Bitmap() { byte[] data = getImageFormBundle(); // 将byte数组转换成Bitmap对象 Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); return bitmap; }}
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