Android自动聚焦、摄像头拍照、缩放至标准大小的完整实现

第一，布局文件。里面有一个surfaceview和三个按钮，分别是预览、拍照、保存。

[html]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/mySurfaceView"
    android:layout_width="fill_parent"
    android:background="#D1EEEE"
    android:layout_height="800px"
    android:gravity="center" />

<LinearLayout
    android:id="@+id/LinearLayout01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:paddingTop="20dip"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/btnPreview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:text="预览" />

    <Button
        android:id="@+id/btnPhoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="拍照" />

    <Button
        android:id="@+id/btnSave"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="保存" />

</LinearLayout>

</LinearLayout>
第2，源程序：

[cpp]
package yan.guoqi.testphoto;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class TestPhotoActivity extends Activity implements SurfaceHolder.Callback{
    /** Called when the activity is first created. */
    private static final String TAG = "yan:";
    SurfaceView mySurfaceView = null;
    SurfaceHolder mySurfaceHolder = null;
    Button btnPreview = null;
    Button btnPhoto = null;
    Button btnSave = null;
    Camera myCamera = null;
    Camera.Parameters myParameters;
    boolean isView = false;
    Bitmap bm;
    String savePath = "/mnt/sdcard/testPhoto/";
    int cntSave = 0;
    private Camera.AutoFocusCallback mAutoFocusCallback;
    //private Camera.PreviewCallback mPreviewCallback;
    private Timer mTimer;
    private TimerTask mTimerTask;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //璁剧疆鍏ㄥ睆鏃犳爣棰?       requestWindowFeature(Window.FEATURE_NO_TITLE);
        int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
        Window myWindow = this.getWindow();
        myWindow.setFlags(flag, flag);
        setContentView(R.layout.main); //璁剧疆甯冨眬
        mySurfaceView = (SurfaceView)findViewById(R.id.mySurfaceView);
        mySurfaceView.setZOrderOnTop(true);
        mySurfaceHolder = mySurfaceView.getHolder();
        mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);
        btnPreview = (Button)findViewById(R.id.btnPreview);
        btnPhoto = (Button)findViewById(R.id.btnPhoto);
        btnSave = (Button)findViewById(R.id.btnSave);
        if(!isFolderExist(savePath)) //濡傛灉鍒涘缓鏂囦欢澶瑰け璐?       {
            AlertDialog.Builder alertDialog = new Builder(TestPhotoActivity.this);
            alertDialog.setTitle("閿欒");
            alertDialog.setMessage("鍥剧墖淇濆瓨鏂囦欢澶瑰垱寤哄け璐ワ紒");
            alertDialog.setPositiveButton("纭畾", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int which) {
             &nbs

补充：移动开发 , Android ,