手机拍照功能的简单实现

<?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>

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;
}

}

<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"/>

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