Android(安卓)实现拍照功能

展示效果图：

[这个是拍的相片]

CameraActivity.java

package com.example.videodisplay;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 sfv;    private Camera camera;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_camera);        sfv = (SurfaceView) findViewById(R.id.sv_camera_surfaceview);        sfv.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);                try {                    camera.setPreviewDisplay(sfv.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                Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length);                try {                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/360Video/Camera_"+System.currentTimeMillis()+".png");                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);                    camera.stopPreview();                    camera.startPreview();                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }        });    }}

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.videodisplay.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>

最后的权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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