安卓拍照

2019-11-08 00:33:49

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Activity-Camera.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.android27.CameraActivity"> <SurfaceView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/sv_camera_surfaceview" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="拍照" android:onClick="takePhoto" /></RelativeLayout>CameraActivitypackage com.example.android27;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class CameraActivity extends AppCompatActivity { PRivate SurfaceView sv_camera_surfaceview; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); sv_camera_surfaceview = (SurfaceView) findViewById(R.id.sv_camera_surfaceview); sv_camera_surfaceview.getHolder().addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder surfaceHolder) { //打开照相机 camera = Camera.open(); //给照相机设置参数 Camera.Parameters parameters= camera.getParameters(); //设置保存的格式 parameters.setPictureFormat(PixelFormat.JPEG); parameters.set("jpeg-quality",85); camera.setParameters(parameters); //将照相机捕捉的画面展示到SurfaceView try { camera.setPreviewDisplay(sv_camera_surfaceview.getHolder()); //开启预览 camera.startPreview(); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) { } @Override public void surfaceDestroyed(SurfaceHolder surfaceHolder) { //关闭 } }); } public void takePhoto(View view){ //拍照 camera.takePicture(null, null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] bytes, Camera camera) { //将字节数组转成图片 //实例化输出流对象，将bytes写入即可 //压缩 //将字节数组转成图片 Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length); try { FileOutputStream fos=new FileOutputStream("/mnt/sdcard/DCIM/camera/G_"+System.currentTimeMillis()+".png"); bitmap.compress(Bitmap.CompressFormat.PNG,85,fos); camera.stopPreview(); camera.startPreview(); } catch (FileNotFoundException e) { e.printStackTrace(); } } }); }}

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