- 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>
来源: http://www.phpxs.com/code/1002839/