Android Camera简单例程

CameraDemoActivity.java

package com.lau.camera;import java.io.BufferedOutputStream;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.graphics.Bitmap;import android.graphics.BitmapFactory;import android.hardware.Camera;import android.hardware.Camera.PictureCallback;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class CameraDemoActivity extends Activity implements SurfaceHolder.Callback, OnClickListener {private Button btnPlay = null;private SurfaceView surfaceView = null;private SurfaceHolder holder = null;private Camera mCamera = null;/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        viewInit();    }    private void viewInit() {    btnPlay = (Button) findViewById(R.id.ok);    surfaceView = (SurfaceView) findViewById(R.id.surfaceview);    holder = surfaceView.getHolder();    holder.addCallback(this);//        holder.setFixedSize(176, 144);        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    btnPlay.setOnClickListener(this);    }    @Overridepublic void onClick(View v) {// TODO Auto-generated method stubif(v.getId() == btnPlay.getId()) {mCamera.takePicture(null, null, new PicCallback());}}class PicCallback implements PictureCallback {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {// TODO Auto-generated method stubBitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);SimpleDateFormat dataFormat = new SimpleDateFormat("yyyyMMdd");Date date = new Date(System.currentTimeMillis());String time = dataFormat.format(date);File picFile = new File(Environment.getExternalStorageDirectory() + "/books/" + time + ".jpg");if(!picFile.exists()) {try {picFile.createNewFile();BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(picFile));bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);bos.flush();bos.close();Toast.makeText(getApplicationContext(), "Success", 3000).show();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();print("Take picture fail.");}}}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {print("surface changed");mCamera.startPreview();}@Overridepublic void surfaceCreated(SurfaceHolder holder) {print("surface created");try {//注意这里不能放在onCreate()里面，否则将无法形成预览效果mCamera = Camera.open();print("open camera success");} catch (Exception e) {mCamera = Camera.open(Camera.getNumberOfCameras()-1);e.printStackTrace();}if(mCamera != null) {try {mCamera.setPreviewDisplay(holder);mCamera.setDisplayOrientation(90);} catch (IOException e) {e.printStackTrace();}} else {Toast.makeText(getApplicationContext(), "Open Camera Fail, exit!", 3000).show();finish();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {mCamera.stopPreview();mCamera.release();mCamera = null;}private void print(Object o) {Log.d("DEBUG", "" + o);}}

 

main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <SurfaceView        android:id="@+id/surfaceview"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        />    <Button        android:id="@+id/ok"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:text="OK" /></RelativeLayout>

权限：

<uses-permission android:name="android.permission.CAMERA"/><uses-feature android:name="android.hardware.camera" /><uses-feature android:name="android.hardware.camera.autofocus" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

 

参考链接：

http://www.eoeandroid.com/thread-2193-1-1.html

http://blog.csdn.net/liujianminghero/article/details/7464038

http://topic.csdn.net/u/20120518/14/00457380-e333-46f8-9d7f-8eee0d82e3b9.html

http://vaero.blog.51cto.com/4350852/779942

http://stackoverflow.com/questions/3890381/camera-setparameters-failed-in-android   setParameters failed，可见此贴。