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"?>
<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="match_parent"
    android:layout_height="match_parent"
    android:layout_alignparentleft="true"
    android:layout_toleftof="@+id/rlright" />

  <linearlayout
    android:id="@+id/rlright"
    android:layout_width="40dp"
    android:layout_height="match_parent"
    android:layout_alignparentright="true"
    android:background="#2b2b2b"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <linearlayout
      android:layout_width="wrap_content"
      android:layout_height="0dip"
      android:layout_weight="1"
      android:gravity="center" >

      <button
        android:id="@+id/btn_goback"
        style="@style/petextbutton"
        android:text="返回"/>
    </linearlayout>

    <linearlayout
      android:layout_width="wrap_content"
      android:layout_height="0dip"
      android:layout_weight="1"
      android:gravity="center" >

      <button
        android:id="@+id/btn_takephoto"
        style="@style/petextbutton"
        android:text="拍照" />
    </linearlayout>
  </linearlayout>

</relativelayout>

在清单文件需要添加相应权限：

  <uses-permission android:name="android.permission.camera"/>
  <uses-feature android:name="android.hardware.camera"/>
  <uses-feature android:name="android.hardware.camera.autofocus"/>

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。