实现手机拍照

2019-11-08 00:34:51

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拍照实现步骤： <1>界面使用SurfaceView控件，显示照相机的画面 <2>SurfaceView接受摄像头界面变化的信息 surfaceView.getHolder().addCallback() <3>重写三个方法 surfaceDestroyed—>当预览界面关闭时，触发一般在这里执行销毁照相机的操作，释放内存 camera.stopPReview(); camera.release(); camera = null; surfaceCreated—–>预览界面被创建时，调用一般在这里打开照相机和设置照相机的一些参数 surfaceChanged—–>当预览界面的格式和大小发生改变时，触发

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" tools:context="com.zking.android_25.CameraActivity"> <SurfaceView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/sv" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="拍照" android:onClick="takePhoto" /></RelativeLayout>

CameraActivity.java

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; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); sv = (SurfaceView) findViewById(R.id.sv); sv.getHolder().addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder surfaceHolder) { //打开照相机 camera = Camera.open(); //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.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) { } }); } public void takePhoto(View view){ //拍照 camera.takePicture(null, null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] bytes, Camera camera) { Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length); try { FileOutputStream fos=new FileOutputStream("/mnt/sdcard/DCIM/camera/Test"+System.currentTimeMillis()+".png"); bitmap.compress(Bitmap.CompressFormat.PNG,85,fos); camera.stopPreview(); camera.startPreview(); } catch (FileNotFoundException e) { e.printStackTrace(); } } }); }}

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