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Android实现手机拍照功能

2019年07月24日 | 移动技术网移动技术 | 我要评论

本文实例为大家讲解如何轻松实现android手机拍照功能，分享给大家供大家参考。具体如下：

一、布局文件main.xml

<?xml version="1.0" encoding="utf-8"?>
<framelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >

  <surfaceview
    android:id="@+id/surfaceview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

  <relativelayout
    android:id="@+id/buttonlayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:visibility="gone" >

    <button
      android:id="@+id/takepicture"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignparentbottom="true"
      android:layout_alignparentright="true"
      android:layout_marginright="5dp"
      android:onclick="takepicture"
      android:text="@string/takepicture" />

    <button
      android:id="@+id/autofocus"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_aligntop="@id/takepicture"
      android:layout_marginright="20dp"
      android:layout_toleftof="@id/takepicture"
      android:onclick="takepicture"
      android:text="@string/autofocus" />
  </relativelayout>

</framelayout>

二、mainactivity.java

import java.io.file;
import java.io.fileoutputstream;

import android.app.activity;
import android.hardware.camera;
import android.hardware.camera.picturecallback;
import android.os.bundle;
import android.os.environment;
import android.view.motionevent;
import android.view.surfaceholder;
import android.view.surfaceholder.callback;
import android.view.surfaceview;
import android.view.view;
import android.view.viewgroup;
import android.view.window;
import android.view.windowmanager;

public class mainactivity extends activity {
  private view layout;
  private camera camera;

  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    requestwindowfeature(window.feature_no_title);
    getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,
        windowmanager.layoutparams.flag_fullscreen);
    setcontentview(r.layout.main);

    layout = this.findviewbyid(r.id.buttonlayout);

    surfaceview surfaceview = (surfaceview) this
        .findviewbyid(r.id.surfaceview);
    surfaceview.getholder()
        .settype(surfaceholder.surface_type_push_buffers);
    surfaceview.getholder().setfixedsize(176, 144);
    surfaceview.getholder().setkeepscreenon(true);
    surfaceview.getholder().addcallback(new surfacecallback());
  }

  public void takepicture(view v) {
    if (camera != null) {
      switch (v.getid()) {
      case r.id.takepicture:
        camera.takepicture(null, null, new mypicturecallback());
        break;

      case r.id.autofocus:
        camera.autofocus(null);
        break;
      }
    }
  }

  private final class mypicturecallback implements picturecallback {
    public void onpicturetaken(byte[] data, camera camera) {
      try {
        file jpgfile = new file(
            environment.getexternalstoragedirectory(),
            system.currenttimemillis() + ".jpg");
        fileoutputstream outstream = new fileoutputstream(jpgfile);
        outstream.write(data);
        outstream.close();
        camera.startpreview();
      } catch (exception e) {
        e.printstacktrace();
      }
    }

  }

  private final class surfacecallback implements callback {
    public void surfacecreated(surfaceholder holder) {
      try {
        camera = camera.open();// 打开摄像头
        camera.parameters parameters = camera.getparameters();
        // log.i("mainactivity", parameters.flatten());
        parameters.setpreviewsize(800, 480);
        parameters.setpreviewframerate(5);
        parameters.setpicturesize(1024, 768);
        parameters.setjpegquality(80);
        camera.setparameters(parameters);
        camera.setpreviewdisplay(holder);
        camera.startpreview();// 开始预览
      } catch (exception e) {
        e.printstacktrace();
      }
    }

    public void surfacechanged(surfaceholder holder, int format, int width,
        int height) {
    }

    public void surfacedestroyed(surfaceholder holder) {
      if (camera != null) {
        camera.release();
        camera = null;
      }
    }

  }

  @override
  public boolean ontouchevent(motionevent event) {
    if (event.getaction() == motionevent.action_down) {
      layout.setvisibility(viewgroup.visible);
      return true;
    }
    return super.ontouchevent(event);
  }
}

三、添加权限

 <uses-permission android:name="android.permission.camera" />
  <!-- 在sdcard中创建与删除文件权限 -->
  <uses-permission android:name="android.permission.mount_unmount_filesystems" />
  <!-- 往sdcard写入数据权限 -->
  <uses-permission android:name="android.permission.write_external_storage" />

效果如下：