Android 多媒体拍照以及录视频

来源：互联网发布：屠程瑶淘宝编辑：程序博客网时间：2024/05/29 10:42

我上一篇博客写了多媒体关于音乐播放，接下来我就写一个关于自定义手机拍照和手机录视频。
一、手机拍照
1、先写一个简单的拍照布局

<?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:id="@+id/activity_main"    android:layout_width="match_parent" android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.cameravideo.MainActivity">    <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>

2、再写Java代码

package com.example.cameravideo;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 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("/DCIM/Camera/G150820_"+System.currentTimeMillis()+".png");                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);                    camera.stopPreview();                    camera.startPreview();                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }        });    }}

二、手机录视频
1、据上，写一个简单的布局

<?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:id="@+id/activity_media_recorder"    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"    tools:context="com.example.cameravideo.MediaRecorderActivity">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="350dp"        android:id="@+id/sv_recorder_surface"        />    <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="结束"        android:onClick="stop"        /></LinearLayout>

2、写Java代码

package com.example.cameravideo;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();;        //从照相机采集视频mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        //设置格式        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);        ////设置视频编码方式        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;        }    }}

两者最重要的是：权限

 <!-- 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" />

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