android如何实现后台拍照
转载地址:http://www.apkbus.com/android-69728-2-1.html
（1）CameraActivity.java
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package com.camera.test;import android.app.Activity;import android.content.pm.ActivityInfo;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;import android.widget.RelativeLayout;public class CameraActivity extends Activity { private CameraView view; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().clearFlags( WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN); getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN); requestWindowFeature(Window.FEATURE_NO_TITLE);// 设置横屏模式以及全屏模式 view = new CameraView(this);// 通过一个surfaceview的view来实现拍照 view.setId(1); view = new CameraView(this, this); setContentView(R.layout.camera_layout); RelativeLayout relative = (RelativeLayout) this.findViewById(R.id.ly); RelativeLayout.LayoutParams Layout = new RelativeLayout.LayoutParams(3, 3);// 设置surfaceview使其满足需求无法观看预览 Layout.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, 1); Layout.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 1); relative.addView(view, Layout); }}（2） CameraView.javapackage com.camera.test;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Point;import android.graphics.PointF;import android.hardware.Camera;import android.hardware.Camera.AutoFocusCallback;import android.hardware.Camera.ShutterCallback;import android.media.AudioManager;import android.media.FaceDetector;import android.media.FaceDetector.Face;import android.os.Environment;import android.os.Handler;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.widget.Toast;public class CameraView extends SurfaceView implements SurfaceHolder.Callback, Camera.PictureCallback{ private SurfaceHolder holder; private Camera camera; private Camera.Parameters parameters; private Activity act; private Handler handler = new Handler(); private Context context; private SurfaceView surfaceView; private AudioManager audio; private int current; public CameraView(Context context) { super(context); surfaceView = this; audio = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); final int current = audio.getRingerMode(); audio.setRingerMode(AudioManager.RINGER_MODE_SILENT); this.context = context; holder = getHolder();// 生成Surface Holder holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 指定Push Buffer handler.postDelayed(new Runnable() { @Override public void run() { if (camera == null) { handler.postDelayed(this, 1 * 1000);// 由于启动camera需要时间，在此让其等两秒再进行聚焦知道camera不为空 } else { camera.autoFocus(new AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) { if (success) { camera.takePicture(new ShutterCallback() {// 如果聚焦成功则进行拍照 @Override public void onShutter() { } }, null, CameraView.this); } else { } } }); } } }, 2 * 1000); } public CameraView(Context context, Activity act) {// 在此定义一个构造方法用于拍照过后把CameraActivity给finish掉 this(context); this.act = act; } @Override public void surfaceCreated(final SurfaceHolder holder) { // TODO Auto-generated method stub camera = Camera.open();// 摄像头的初始化 handler.postDelayed(new Runnable() { @Override public void run() { if (holder != null) { try { camera.setPreviewDisplay(holder); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { handler.postDelayed(this, 1 * 1000); } } }, 2 * 1000); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub parameters = camera.getParameters(); camera.setParameters(parameters);// 设置参数 camera.startPreview();// 开始预览 } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } public void onPictureTaken(byte[] data, Camera camera) {// 拍摄完成后保存照片 try { Date date = new Date(); SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); String time = format.format(date); //在SD卡上创建文件夹 File file = new File(Environment.getExternalStorageDirectory() + "/myCamera/pic"); if (!file.exists()) { file.mkdirs(); } String path = Environment.getExternalStorageDirectory() + "/myCamera/pic/" + time + ".jpg"; data2file(data, path); camera.setPreviewCallback(null); camera.stopPreview(); camera.release(); camera = null; holder.removeCallback(CameraView.this); audio.setRingerMode(current); act.finish(); //uploadFile(path); } catch (Exception e) { } } private void data2file(byte[] w, String fileName) throws Exception {// 将二进制数据转换为文件的函数 FileOutputStream out = null; try { out = new FileOutputStream(fileName); out.write(w); out.close(); } catch (Exception e) { if (out != null) out.close(); throw e; } }// private void uploadFile(String filePath)// 拍照过后上传文件到服务器// {// }}（3）camera_layout.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ly" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > </RelativeLayout> |
