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;



	@Override

	protected 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 {

		@Override

		public void surfaceChanged(SurfaceHolder holder, int format, int width,

				int height) {

			// TODO Auto-generated method stub



		}



		@Override

		public 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();

			}

		}



		@Override

		public 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 {

		@Override

		public 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();

			}

		}

	}



	@Override

	public 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">