本文实例为大家分享了Android实现拍照和录制视频功能的具体代码,供大家参考,具体内容如下
文档中的Camera
要使用Camera,首先我们先看一下文档中是怎么介绍的。相对于其他绝大多数类,文档对Camera的介绍还是比较详尽的,包含了使用过程中所需要的步骤说明,当然,这也表明了它在实际使用中的繁琐。
首先,需要在AndroidManifest.xml中声明以下权限和特性:
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<uses-permission android:name= "android.permission.CAMERA" /> <uses-feature android:name= "android.hardware.camera" /> <uses-feature android:name= "android.hardware.camera.autofocus" /> |
然后,拍照的话,需要以下十步:
1. 通过open(int)方法得到一个实例
2. 通过getParameters()方法得到默认的设置
3. 如果有必要,修改上面所返回的Camera.Parameters对象,并调用setParameters(Camera.Parameters) 进行设置
4. 如果有需要,调用setDisplayOrientation(int)设置显示的方向
5. 这一步很重要,通过setPreviewDisplay(SurfaceHolder)传入一个已经初始化了的SurfaceHolder,否则无法进行预览。
6. 这一步也很重要,通过startPreview()开始更新你的预览界面,在你拍照之前,它必须开始。
7. 调用takePicture(Camera.ShutterCallback, Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)进行拍照,等待它的回调
8. 拍照之后,预览的展示会停止。如果想继续拍照,需要先再调用startPreview()。
9. 调用stopPreview()停止预览。
10. 非常重要,调用release()释放Camera,以使其他应用也能够使用相机。你的应用应该在onPause()被调用时就进行释放,在onResume()时再重新open()。
上面就是文档中关于使用Camera进行拍照的介绍了。接下来说一下我的使用场景。
直接上代码好咯
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:paddingBottom = "@dimen/activity_vertical_margin" android:paddingLeft = "@dimen/activity_horizontal_margin" android:paddingRight = "@dimen/activity_horizontal_margin" android:paddingTop = "@dimen/activity_vertical_margin" android:orientation = "vertical" > < SurfaceView android:layout_width = "match_parent" android:layout_height = "0dp" android:layout_weight = "1" android:id = "@+id/sv_main_surface" /> < Button android:layout_width = "match_parent" android:layout_height = "wrap_content" android:onClick = "takePhoto" android:text = "拍照" /> </ LinearLayout > |
Activity
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import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.PixelFormat; import android.hardware.Camera; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.Toast; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class MainActivity extends AppCompatActivity { private SurfaceView sv_main_surface; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); sv_main_surface = (SurfaceView) findViewById(R.id.sv_main_surface); sv_main_surface.getHolder().addCallback( new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder surfaceHolder) { //打开照相机 camera = Camera.open(); //设置参数 Camera.Parameters parameters=camera.getParameters(); parameters.setPictureFormat(PixelFormat.JPEG); parameters.set( "jpeg-quality" , 85 ); camera.setParameters(parameters); //将画面展示到SurfaceView try { camera.setPreviewDisplay(sv_main_surface.getHolder()); } catch (IOException e) { e.printStackTrace(); } //开启预览效果 camera.startPreview(); } @Override public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) { } @Override public void surfaceDestroyed(SurfaceHolder surfaceHolder) { if (camera!= null ){ camera.stopPreview(); camera.release(); camera= null ; } } }); } public void takePhoto(View view){ camera.takePicture( null , null , new Camera.PictureCallback() { @Override public void onPictureTaken( byte [] bytes, Camera camera) { //技术:图片压缩技术 Bitmap bitmap=BitmapFactory.decodeByteArray(bytes, 0 ,bytes.length); try { FileOutputStream fos= new FileOutputStream( "/mnt/sdcard/G150820_" +System.currentTimeMillis()+ ".png" ); bitmap.compress(Bitmap.CompressFormat.PNG, 85 ,fos); camera.stopPreview(); camera.startPreview(); } catch (FileNotFoundException e) { e.printStackTrace(); } } }); } } |
录制视频:
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<? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:paddingBottom = "@dimen/activity_vertical_margin" android:paddingLeft = "@dimen/activity_horizontal_margin" android:paddingRight = "@dimen/activity_horizontal_margin" android:paddingTop = "@dimen/activity_vertical_margin" > < SurfaceView android:layout_width = "match_parent" android:layout_height = "match_parent" android:id = "@+id/sv_recorder_surface" /> < LinearLayout android:layout_width = "match_parent" android:layout_height = "wrap_content" android:orientation = "vertical" > < Button android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "开始" android:onClick = "start" /> < Button android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "停止" android:onClick = "stop" /> </ LinearLayout > </ RelativeLayout > |
代码:
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import android.media.MediaRecorder; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.SurfaceView; import android.view.View; import java.io.IOException; public class MediaRecorderActivity extends AppCompatActivity { private SurfaceView sv_recorder_surface; private MediaRecorder mediaRecorder; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_media_recorder); sv_recorder_surface = (SurfaceView) findViewById(R.id.sv_recorder_surface); //实例化媒体录制器 mediaRecorder = new MediaRecorder(); } public void start(View view){ mediaRecorder.reset(); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //设置格式 mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //设置保存路径 mediaRecorder.setOutputFile( "/mnt/sdcard/G150820_" +System.currentTimeMillis()+ ".mp4" ); mediaRecorder.setPreviewDisplay(sv_recorder_surface.getHolder().getSurface()); try { mediaRecorder.prepare(); mediaRecorder.start(); } catch (IOException e) { e.printStackTrace(); } } public void stop(View view){ if (mediaRecorder!= null ){ mediaRecorder.stop(); mediaRecorder.release(); mediaRecorder= null ; } } } |
最重要的是别忘了加权限哦
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<!-- 打开照相机的权限 --> <uses-permission android:name= "android.permission.CAMERA" /> <uses-permission android:name= "android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name= "android.permission.RECORD_AUDIO" > </uses-permission> |
简单的拍照还录制视频的功能就实现了。
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服务器之家。
原文链接:https://blog.csdn.net/HuangGui971022/article/details/55046385