Android相机（Camera）焦距问题

Question

Camera.Parameters parameters = myCamera.getParameters();
parameters.setFocusMode("macro"); <---这里设置
myCamera.setParameters(parameters);  /**
         * Auto-focus mode.
         */
        public static final String FOCUS_MODE_AUTO = "auto";        /**
         * Focus is set at infinity. Applications should not call
         * {@link #autoFocus(AutoFocusCallback)} in this mode.
         */
        public static final String FOCUS_MODE_INFINITY = "infinity";
        public static final String FOCUS_MODE_MACRO = "macro";

Answer 1

1楼你好，parameters.setFocusMode("macro"); <---这里设置-----------"macro"这个值是什么？下面是我的源码，你帮我看看是在什么地方实现远近焦距调节，十分感谢！
package com.gsta.test;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.OnZoomChangeListener;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.media.AudioManager;
import android.media.ToneGenerator;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;public class CameraActivity extends Activity { private CameraPreview preview;
private Camera camera;
private ToneGenerator tone;
private static final int OPTION_SNAPSHOT = 0; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
preview = new CameraPreview(this);
setContentView(preview);
} @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub if (camera != null && event.getRepeatCount() == 0) {
switch (keyCode) {
case KeyEvent.KEYCODE_CAMERA:
// camera.takePicture(shutterCallback, null, jpegCallback);
camera.takePicture(shutterCallback, null, null);
break; case KeyEvent.KEYCODE_VOLUME_DOWN:
System.out.println("KeyEvent.KEYCODE_VOLUME_DOWN");
break; case KeyEvent.KEYCODE_VOLUME_UP:
System.out.println("KeyEvent.KEYCODE_VOLUME_UP");
break; }
} return super.onKeyDown(keyCode, event);
} // @Override
// public boolean onOptionsItemSelected(MenuItem item) {
// int itemId = item.getItemId();
// switch (itemId) {
// case OPTION_SNAPSHOT:
// // 拍摄照片
// // camera.takePicture(shutterCallback, null, jpegCallback);
// camera.takePicture(shutterCallback, null, null);
// System.out.println("----->>>>>>>>>>>menu");
// break;
// }
// return true;
// } // 返回照片的JPEG格式的数据
private PictureCallback jpegCallback = new PictureCallback() { public void onPictureTaken(byte[] data, Camera camera) {
System.out.println("----->>>>>>>>>>>jpegCallback");
Parameters ps = camera.getParameters();
if (ps.getPictureFormat() == PixelFormat.JPEG) {
// 存储拍照获得的图片
String path = save(data);
System.out.println("----->>>>>>>>>>>save()");
// 将图片交给Image程序处理
Uri uri = Uri.fromFile(new File(path));
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.setDataAndType(uri, "image/jpeg");
startActivity(intent);
System.out.println("----->>>>>>>>>>>startActivity()");
}
}
};

private OnZoomChangeListener onZoomChangeListener=new OnZoomChangeListener(){ @Override
public void onZoomChange(int zoomValue, boolean stopped, Camera camera) {
// TODO Auto-generated method stub

System.out.println("OnZoomChangeListener");

}

};




// 快门按下的时候onShutter()被回调
private ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() {
if (tone == null)
// 发出提示用户的声音
tone = new ToneGenerator(AudioManager.STREAM_MUSIC,
ToneGenerator.MAX_VOLUME);
tone.startTone(ToneGenerator.TONE_PROP_BEEP2);
}
}; private String save(byte[] data) { System.out.println("----->>>>>>>>>>>save2()");
String path = "/sdcard/" + System.currentTimeMillis() + ".jpg";
System.out.println("----->>>>>>>>>>>" + path);
try {
// 判断是否装有SD卡
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 判断SD卡上是否有足够的空间
String storage = Environment.getExternalStorageDirectory()
.toString();
StatFs fs = new StatFs(storage);
long available = fs.getAvailableBlocks() * fs.getBlockSize();
if (available < data.length) {
// 空间不足直接返回空
return null;
}
File file = new File(path);
if (!file.exists())
// 创建文件
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file); fos.write(data);
System.out.println("----->>>>>>>>>>>write()");
fos.close();
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return path;
} // @Override
// public boolean onCreateOptionsMenu(Menu menu) {
// menu.add(0, OPTION_SNAPSHOT, 0, R.string.snapshot);
// return super.onCreateOptionsMenu(menu);
// } private class CameraPreview extends SurfaceView implements
SurfaceHolder.Callback {
SurfaceHolder mHolder; public CameraPreview(Context context) {
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
} // Sureface创建的时候，此方法被调用
public void surfaceCreated(SurfaceHolder holder) {
// 打开摄像头，获得Camera对象
camera = Camera.open();
try {
// 设置显示
camera.setPreviewDisplay(holder);
} catch (IOException exception) {
camera.release();
camera = null;
}
} // Surface销毁的时候，此方法被调用
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
// 释放Camera
camera.release();
camera = null;
} public void surfaceChanged(SurfaceHolder holder, int format, int w,
int h) {
// 已经获得Surface的width和height，设置Camera的参数
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(w, h);
// parameters.setFocusMode("macro");
System.out.println(">>>>>>>>>>>>>>>>>>>>>"
+ parameters.getPictureSize()); camera.setParameters(parameters);
// 开始预览
camera.startPreview();
}
}}

Answer 2

rivate OnZoomChangeListener onZoomChangeListener=new OnZoomChangeListener(){@Override
public void onZoomChange(int zoomValue, boolean stopped, Camera camera) {
// TODO Auto-generated method stubSystem.out.println("OnZoomChangeListener");}};这一段是的，可惜没有实现。

Answer 3

找到了。分享一下！
mZoomBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  
              
            public void onStopTrackingTouch(SeekBar seekBar) {  
                // TODO Auto-generated method stub  
                  
            }  
              
            public void onStartTrackingTouch(SeekBar seekBar) {  
                // TODO Auto-generated method stub  
                  
            }  
              
            public void onProgressChanged(SeekBar seekBar, int progress,  
                    boolean fromUser) {  
                // TODO Auto-generated method stub  
                Parameters p = myCamera.getParameters();  
                p.setZoom(progress);  
                myCamera.setParameters(p);  
            }  
        });