Android自定义相机实现自动对焦和手动对焦

Android自定义相机实现自动对焦和手动对焦：
不调用系统相机，因为不同的机器打开相机呈现的界面不统一也不能满足需求。
所以为了让程序在不同的机器上呈现出统一的界面，并且可以根据需求进行布局，做了此demo。

程序实现代码如下：

import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.lang.reflect.Method;import android.graphics.PixelFormat;import android.hardware.Camera;import android.hardware.Camera.AutoFocusCallback;import android.hardware.Camera.Parameters;import android.hardware.Camera.PictureCallback;import android.hardware.Camera.ShutterCallback;import android.os.Build;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.widget.Button;import com.hp.classes.config.Constants;import com.hp.classes.tools.CommonUtils;import com.hp.classes.ui.BaseActivity;@SuppressWarnings("deprecation")public class PhotographActivity extends BaseActivity implements OnClickListener, SurfaceHolder.Callback {  private SurfaceView surfaceView;  private Camera camera;  private Camera.Parameters parameters;  private Button btn_goback, btn_takephoto;  private SurfaceHolder surfaceHolder;    @Override  protected void onDestroy() {    super.onDestroy();    if(camera != null){      camera.stopPreview();      camera.release();      camera = null;    }  }    @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.classes_activity_takephoto);    initView();  }  @Override  protected void onResume() {    super.onResume();    initCamera();  }  private void initView(){    btn_goback = (Button) findViewById(R.id.btn_goback);    btn_goback.setOnClickListener(this);    btn_takephoto = (Button) findViewById(R.id.btn_takephoto);    btn_takephoto.setOnClickListener(this);    surfaceView = (SurfaceView) findViewById(R.id.surfaceView);    surfaceView.setFocusable(true);    surfaceView.setOnClickListener(this);    surfaceView.setBackgroundColor(TRIM_MEMORY_BACKGROUND);    surfaceHolder = surfaceView.getHolder();    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    surfaceHolder.setKeepScreenOn(true);    surfaceHolder.setFixedSize(400, 300);    surfaceHolder.addCallback(this);  }  @Override  public void surfaceDestroyed(SurfaceHolder holder) {    // TODO Auto-generated method stub    camera.stopPreview();    camera.release();    camera = null;  }  @Override  public void surfaceCreated(SurfaceHolder holder) {    // TODO Auto-generated method stub    try {      camera.setPreviewDisplay(surfaceHolder);    } catch (IOException e) {      e.printStackTrace();    }  }  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    // 实现自动对焦    camera.autoFocus(new AutoFocusCallback() {      @Override      public void onAutoFocus(boolean success, Camera camera) {        if (success) {          camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦          doAutoFocus();        }      }    });  }  // 相机参数的初始化设置  private void initCamera() {    if (null == camera) {      camera = Camera.open();    }    parameters = camera.getParameters();    parameters.setPictureFormat(PixelFormat.JPEG);    parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);    if (!Build.MODEL.equals("KORIDY H30")) {      parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦    }else{      parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);    }    camera.setParameters(parameters);    setDispaly(camera);    camera.startPreview();    camera.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上  }  // 控制图像的正确显示方向  private void setDispaly(Camera camera) {    if (Integer.parseInt(Build.VERSION.SDK) >= 8) {      setDisplayOrientation(camera, -90);    } else {      parameters.setRotation(-90);    }  }  // 实现的图像的正确显示  private void setDisplayOrientation(Camera camera, int i) {    Method downPolymorphic;    try {      downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });      if (downPolymorphic != null) {        downPolymorphic.invoke(camera, new Object[] { i });      }    } catch (Exception e) {      Log.e("Came_e", "图像出错");    }  }  @Override  public void onClick(View v) {    switch (v.getId()) {    case R.id.surfaceView:      doAutoFocus();      break;    case R.id.btn_takephoto:      takePicture();      break;    case R.id.btn_goback:      finish();      break;    default:      break;    }  }  // handle button auto focus  private void doAutoFocus() {    parameters = camera.getParameters();    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);    camera.setParameters(parameters);    camera.autoFocus(new AutoFocusCallback() {      @Override      public void onAutoFocus(boolean success, Camera camera) {        if (success) {          camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。          if (!Build.MODEL.equals("KORIDY H30")) {            parameters = camera.getParameters();            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦            camera.setParameters(parameters);          }else{            parameters = camera.getParameters();            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);            camera.setParameters(parameters);          }        }      }    });  }  private void takePicture() {    camera.takePicture(shutterCallback, rawCallback, jpegCallback);  }  // define shutterCallback  ShutterCallback shutterCallback = new ShutterCallback() {    public void onShutter() {      // TODO Do something when the shutter closes.    }  };  PictureCallback rawCallback = new PictureCallback() {    public void onPictureTaken(byte[] data, Camera camera) {      // TODO Do something with the image RAW data.    }  };  // stroe the picture in format jpeg  PictureCallback jpegCallback = new PictureCallback() {    public void onPictureTaken(byte[] data, Camera camera) {      // Save the image JPEG data to the SD card      FileOutputStream outStream = null;      try {        //修改图片路径和名称        String tempFilename = String.valueOf(System.currentTimeMillis()) + ".jpg";        File folder = Constants.CACHE_FOLDER;        if (!folder.isDirectory()) {          folder.mkdirs();        }        String path = Constants.CACHE_FOLDER + File.separator + tempFilename;        outStream = new FileOutputStream(path);        outStream.write(data);        outStream.flush();        outStream.close();        surfaceView.setBackgroundDrawable(new BitmapDrawable(BitmapFactory.decodeByteArray(data, 0, data.length)));      } catch (FileNotFoundException e) {        Log.e("TAG", "File Note Found", e);      } catch (IOException e) {        Log.e("TAG", "IO Exception", e);      }    }  };}

classes_activity_takephoto.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>

在清单文件需要添加相应权限：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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