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云代码 - android代码库

Android摄像头

2012-08-27 作者: 神马举报

[android]代码库

import java.io.BufferedOutputStream;
 
import java.io.File;
 
import java.io.FileOutputStream;
 
import java.io.IOException;
 
import java.util.Calendar;
 
import java.util.Locale;
 
import android.app.Activity;
 
import android.content.Context;
 
import android.graphics.Bitmap;
 
import android.graphics.BitmapFactory;
 
import android.graphics.PixelFormat;
 
import android.hardware.Camera;
 
import android.os.Bundle;
 
import android.text.format.DateFormat;
 
import android.util.Log;
 
import android.view.KeyEvent;
 
import android.view.SurfaceHolder;
 
import android.view.SurfaceView;
 
import android.view.Window;
 
import android.view.WindowManager;
 
import android.widget.FrameLayout;
 
import android.widget.TextView;
 
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
    private CameraView cv;
 
    // 准备一个相机对象
 
    private Camera mCamera = null;
 
    // 准备一个Bitmap对象
 
    private Bitmap mBitmap = null;
 
    // 准备一个保存图片的PictureCallback对象
 
    public Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
 
        public void onPictureTaken(byte[] data, Camera camera) {
 
            Log.i("yao", "onPictureTaken");
 
            Toast.makeText(getApplicationContext(), "正在保存……", Toast.LENGTH_LONG)
                    .show();
 
            // 用BitmapFactory.decodeByteArray()方法可以把相机传回的裸数据转换成Bitmap对象
 
            mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
 
            // 接下来的工作就是把Bitmap保存成一个存储卡中的文件
 
            File file = new File("/sdcard/YY"
                    + new DateFormat().format("yyyyMMdd_hhmmss",
                            Calendar.getInstance(Locale.CHINA)) + ".jpg");
 
            try {
 
                file.createNewFile();
 
                BufferedOutputStream os = new BufferedOutputStream(
                        new FileOutputStream(file));
 
                mBitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
 
                os.flush();
 
                os.close();
 
                Toast.makeText(getApplicationContext(), "图片保存完毕,在存储卡的根目录",
                        Toast.LENGTH_LONG).show();
 
            } catch (IOException e) {
 
                e.printStackTrace();
 
            }
 
        }
 
    };
 
    // Activity的创建方法
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
 
        // 窗口去掉标题
 
        requestWindowFeature(Window.FEATURE_NO_TITLE);
 
        // 窗口设置为全屏
 
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
 
        // 设置窗口为半透明
 
        getWindow().setFormat(PixelFormat.TRANSLUCENT);
 
        // 提供一个帧布局
 
        FrameLayout fl = new FrameLayout(this);
 
        // 创建一个照相预览用的SurfaceView子类,并放在帧布局的底层
 
        cv = new CameraView(this);
 
        fl.addView(cv);
 
        // 创建一个文本框添加在帧布局中,我们可以看到,文字自动出现在了SurfaceView的前面,由此你可以在预览窗口做出各种特殊效果
 
        TextView tv = new TextView(this);
 
        tv.setText("请按\"相机\"按钮拍摄");
 
        fl.addView(tv);
 
        // 设置Activity的根内容视图
 
        setContentView(fl);
 
    }
 
    // 相机按键按下的事件处理方法
 
    public boolean onKeyDown(int keyCode, KeyEvent event) {
 
        Log.i("yao", "MainActivity.onKeyDown");
 
        if (keyCode == KeyEvent.KEYCODE_CAMERA) {
 
            if (mCamera != null) {
 
                Log.i("yao", "mCamera.takePicture");
 
                // 当按下相机按钮时,执行相机对象的takePicture()方法,该方法有三个回调对象做入参,不需要的时候可以设null
 
                mCamera.takePicture(null, null, pictureCallback);
 
            }
 
        }
 
        return cv.onKeyDown(keyCode, event);
 
    }
 
    // 照相视图
 
    class CameraView extends SurfaceView {
 
        private SurfaceHolder holder = null;
 
        // 构造函数
 
        public CameraView(Context context) {
 
            super(context);
 
            Log.i("yao", "CameraView");
 
            // 操作surface的holder
 
            holder = this.getHolder();
 
            // 创建SurfaceHolder.Callback对象
 
            holder.addCallback(new SurfaceHolder.Callback() {
 
                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
 
                    // 停止预览
 
                    mCamera.stopPreview();
 
                    // 释放相机资源并置空
 
                    mCamera.release();
 
                    mCamera = null;
 
                }
 
                @Override
                public void surfaceCreated(SurfaceHolder holder) {
 
                    // 当预览视图创建的时候开启相机
 
                    mCamera = Camera.open();
 
                    try {
 
                        // 设置预览
 
                        mCamera.setPreviewDisplay(holder);
 
                    } catch (IOException e) {
 
                        // 释放相机资源并置空
 
                        mCamera.release();
 
                        mCamera = null;
 
                    }
 
                }
 
                // 当surface视图数据发生变化时,处理预览信息
 
                @Override
                public void surfaceChanged(SurfaceHolder holder, int format,
                        int width, int height) {
 
                    // 获得相机参数对象
 
                    Camera.Parameters parameters = mCamera.getParameters();
 
                    // 设置格式
 
                    parameters.setPictureFormat(PixelFormat.JPEG);
 
                    // 设置预览大小,这里我的测试机是Milsstone所以设置的是854x480
 
                    parameters.setPreviewSize(854, 480);
 
                    // 设置自动对焦
 
                    parameters.setFocusMode("auto");
 
                    // 设置图片保存时的分辨率大小
 
                    parameters.setPictureSize(2592, 1456);
 
                    // 给相机对象设置刚才设定的参数
 
                    mCamera.setParameters(parameters);
 
                    // 开始预览
 
                    mCamera.startPreview();
 
                }
 
            });
 
            // 设置Push缓冲类型,说明surface数据由其他来源提供,而不是用自己的Canvas来绘图,在这里是由摄像头来提供数据
 
            holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
 
        }
 
    }
 
}
 
 
 
----------------------------------------------------------------
 
<?xml version="1.0" encoding="utf-8"?>
  
<manifest package="basic.android.lesson36" xmlns:android="http://schemas.android.com/apk/res/android" android:versioncode="1" android:versionname="1.0">
  
        <application android:label="@string/app_name" android:icon="@drawable/icon">
  
                <activity android:label="@string/app_name" android:name=".MainActivity" android:screenorientation="landscape" android:configchanges="orientation|keyboardHidden|keyboard">
  
                        <intent -filter="">
  
                                <action android:name="android.intent.action.MAIN">
  
                                <category android:name="android.intent.category.LAUNCHER">
  
                        </category></action></intent>
  
                </activity>
  
 
        </application>
  
        <uses -sdk="" android:minsdkversion="8">
  
        <uses -permission="" android:name="android.permission.CAMERA"></uses>
  
        <uses -permission="" android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses>
  
        <uses -feature="" android:name="android.hardware.camera">
  
        <uses -feature="" android:name="android.hardware.camera.autofocus">
  
</uses></uses></uses></manifest>


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