手机拍照功能的简单实现

1、main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >        <SurfaceView         android:id="@+id/surfaceview"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        />        <LinearLayout         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:orientation="horizontal"        >                <Button             android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="对焦"            android:onClick="focus"            android:layout_marginRight="10dp"            />                <Button             android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="拍照"            android:onClick="takepicture"            android:layout_marginRight="10dp"            />    </LinearLayout></RelativeLayout>

2、MainActivity

package com.njupt.takepicture1;import java.io.File;import java.io.FileOutputStream;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.hardware.Camera.PictureCallback;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.view.Menu;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.Window;import android.view.WindowManager;public class MainActivity extends Activity {private SurfaceView surfaceview;private Camera camera;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.main);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        surfaceview = (SurfaceView) findViewById(R.id.surfaceview);SurfaceHolder holder = surfaceview.getHolder();holder.setFixedSize(176, 144);holder.setKeepScreenOn(true);holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);holder.addCallback(new MySurfaceCallback());}private class MySurfaceCallback implements Callback {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {try {camera = Camera.open();Parameters params = camera.getParameters();params.setJpegQuality(90);params.setPictureSize(1024, 768);params.setPreviewFrameRate(10);camera.setParameters(params);camera.setPreviewDisplay(surfaceview.getHolder());camera.startPreview();} catch (Exception e) {e.printStackTrace();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if (camera != null) {camera.release();camera = null;}}}public void takepicture(View v) {camera.takePicture(null, null, new MyPictureCallback());}private class MyPictureCallback implements PictureCallback {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {try {File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + ".jpg");FileOutputStream fos = new FileOutputStream(file);fos.write(data);camera.startPreview();} catch (Exception e) {e.printStackTrace();}}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

3、AndroidManifest.xml

注册权限

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

横屏显示：

<activity            android:name="com.njupt.takepicture1.MainActivity"            android:label="@string/app_name"             android:screenOrientation="landscape">

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