Android多媒体——(MidiaRecorder音频录制/视频播放surface/Soundpool提示音/调用系统摄像头camera)

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MidiaRecorder音频录制

工作流程图

这里写图片描述

权限

这里写图片描述

写一个小例子来具体说下

layout代码这里就不写了，只放两个按钮，一个开始录音，一个结束录音

MainActivity

import android.media.MediaRecorder;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import java.io.IOException;public class MainActivity extends AppCompatActivity implements View.OnClickListener{    private Button mBtStartRecorder;    private Button mBtStopRecorder;    private MediaRecorder mediaRecorder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtStartRecorder= (Button) findViewById(R.id.button_start_recorder);        mBtStartRecorder.setOnClickListener(this);        mBtStopRecorder= (Button) findViewById(R.id.button_stop_recorder);        mBtStopRecorder.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.button_start_recorder:                mediaRecorder=new MediaRecorder();                mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);//设置音频来源                mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//设置外放格式                mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory()+"/myrecord.3gp");                try {                    mediaRecorder.prepare();                    mediaRecorder.start();                } catch (IOException e) {                    e.printStackTrace();                }                break;            case R.id.button_stop_recorder:                mediaRecorder.stop();                mediaRecorder.reset();                mediaRecorder.release();                break;        }    }}

视频播放

权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

VideoView

layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:id="@+id/button_start_playvideo"        android:text="开始播放"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <VideoView        android:id="@+id/videoview"        android:layout_width="wrap_content"        android:layout_height="400dp" /></LinearLayout>

主函数MyPlayvideo

package com.example.administrator.mediarecorder.mediaplayvideo;import android.os.Bundle;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.MediaController;import android.widget.VideoView;import com.example.administrator.mediarecorder.R;/** * Created by Administrator on 2015/9/15. */public class MyPlayvideo extends AppCompatActivity {    private Button mBtPlayvideo;    private VideoView mVideoview;     //VideoView 是android 系统提供的一个媒体播放显示和控制的控件    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_myplayvideo);        mBtPlayvideo= (Button) findViewById(R.id.button_start_playvideo);        mVideoview= (VideoView) findViewById(R.id.videoview);        mBtPlayvideo.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {             //找到视频地址，还可以通过setVideoUri来找到    mVideoview.setVideoPath(Environment.getExternalStorageDirectory()+"/bb.MP4");                //设置播放位置                mVideoview.setMediaController(new MediaController(MyPlayvideo.this));                mVideoview.start();            }        });    }}

SurfaceView

同样的我们在布局中加入一个按钮和一个SurfaceView，点击按钮，播放视频！用法和前边将播放音频差不多。

layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <Button        android:id="@+id/button_start_playersurface"        android:text="播放视频"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <SurfaceView        android:id="@+id/surfaceView"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

MyPlayersurface

package com.example.administrator.mediarecorder.Playersurface;import android.media.AudioManager;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.view.Surface;import android.view.SurfaceView;import android.view.View;import android.widget.Button;import com.example.administrator.mediarecorder.R;import java.io.IOException;/** * Created by Administrator on 2015/9/15. */public class MyPlayersurface extends AppCompatActivity{    private Button mBtStartSurface;    private SurfaceView mSurfaceView;    private MediaPlayer player;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_myplayersurface);        mSurfaceView= (SurfaceView) findViewById(R.id.surfaceView);        mBtStartSurface= (Button) findViewById(R.id.button_start_playersurface);        mBtStartSurface.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(player==null){                    player=new MediaPlayer();                }                player.reset();                try {                    player.setDataSource(Environment.getExternalStorageDirectory()+"/myvideoview.mp4");                    player.setAudioStreamType(AudioManager.STREAM_MUSIC);                    player.setDisplay(mSurfaceView.getHolder());                    player.prepare();                    player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {                        @Override                        public void onPrepared(MediaPlayer mp) {                            mp.start();                        }                    });                } catch (IOException e) {                    e.printStackTrace();                }            }        });    }}

Soundpool提示音

在Android中播放音频文件一般都使用MediaPlayer，但是一般都是比较长的音频文件，我们可以用soundpool可以播一些短的反应速度要求高的声音，比如通知提示音，消息提示音等。

SoundPool载入音乐文件使用了独立的线程，不会阻塞UI主线程的操作。但是这里如果音效文件过大没有载入完成，我们调用play方法时可能产生严重的后果，这里Android SDK提供了一个SoundPool.OnLoadCompleteListener类来帮助我们了解媒体文件是否载入完成，我们重载 onLoadComplete(SoundPool soundPool, int sampleId, int status) 方法即可获得。

从上面的onLoadComplete方法可以看出该类有很多参数，比如类似id，是的SoundPool在load时可以处理多个媒体一次初始化并放入内存中，这里效率比MediaPlayer高了很多。

SoundPool类支持同时播放多个音效，这对于游戏来说是十分必要的，而MediaPlayer类是同步执行的只能一个文件一个文件的播放。

MainActivity

package com.example.administrator.soundpool;import android.media.AudioAttributes;import android.media.AudioManager;import android.media.SoundPool;import android.os.Build;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;public class MainActivity extends AppCompatActivity {    private Button mBtSoundpool;    private int voiceID;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtSoundpool= (Button) findViewById(R.id.button_soundpool);        mBtSoundpool.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                playSound();            }        });        voiceID=initSoundPool();    }    private SoundPool pool=null;    public void playSound(){        pool.play(voiceID,1,1,0,-1,-1);    }   private int initSoundPool(){      if(Build.VERSION.SDK_INT>=21){          SoundPool.Builder builder=new SoundPool.Builder();          builder.setMaxStreams(2);          AudioAttributes.Builder atterBuilder=new AudioAttributes.Builder();          atterBuilder.setLegacyStreamType(AudioManager.STREAM_MUSIC);          builder.setAudioAttributes(atterBuilder.build());          pool=builder.build();      }else {          pool=new SoundPool(2,AudioManager.STREAM_MUSIC,0);      }       return pool.load(getApplicationContext(),R.raw.msg,1);   }}

调用系统摄像头/从相册中选取照片

权限

这里写图片描述

例子

layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><Button    android:id="@+id/button_start_camera"    android:text="调用摄像头"    android:layout_width="wrap_content"    android:layout_height="wrap_content" />    <Button        android:id="@+id/button_opean_gallery"        android:text="打开相册"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /><ImageView    android:id="@+id/imageview"    android:layout_width="match_parent"    android:layout_height="match_parent" /></LinearLayout>

MyCameraActivity

package com.example.administrator.mediarecorder.camera;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import com.example.administrator.mediarecorder.R;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.net.URI;/** * Created by Administrator on 2015/9/15. */public class MyCameraActivity extends AppCompatActivity {    private Button mBtStartCamera;    private ImageView mImageView;    private File file;    private static final int GET_PIC_FORM_CAMERA = 0X23;    private Button mBtOpeanGallery;    private static final int GET_PIC_FROM_GALLERY = 0X24;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_mycamera);        mImageView = (ImageView) findViewById(R.id.imageview);        mBtStartCamera = (Button) findViewById(R.id.button_start_camera);        mBtStartCamera.setOnClickListener(new View.OnClickListener() {            @Override//点击按钮，打开摄像头            public void onClick(View v) {                Intent intent = new Intent();                intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);//隐式启动系统相机                /*                创建file将拍摄的照片存储                 */                //设置创建的文件路径，和名称（名称是当前时间，保证不会冲突）                file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");                try {                    file.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));//告诉系统相机将照片保存的位置                startActivityForResult(intent, GET_PIC_FORM_CAMERA);//开始启动            }        });        //从相册得到照片        mBtOpeanGallery = (Button) findViewById(R.id.button_opean_gallery);        mBtOpeanGallery.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);                intent.setType("image/*");                startActivityForResult(intent, GET_PIC_FROM_GALLERY);            }        });    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        //得到刚拍的照片//        if (requestCode==GET_PIC_FORM_CAMERA){//            if(resultCode==RESULT_OK){//                ImageZip.zipImage(file.getAbsolutePath());//压缩图片//                mImageView.setImageURI(Uri.fromFile(file));//得到图片//            }////        }        //从相册选取照片        if (resultCode == RESULT_OK) {            switch (requestCode) {                case GET_PIC_FORM_CAMERA:                    ImageZip.zipImage(file.getAbsolutePath());//压缩图片                    mImageView.setImageURI(Uri.fromFile(file));//得到图片                    break;                case GET_PIC_FROM_GALLERY:                    Uri uri=data.getData();                    mImageView.setImageURI(uri);                    break;            }        }    }}

压缩图片类ImageZip

package com.example.administrator.mediarecorder.camera;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import java.io.FileOutputStream;import java.io.IOException;/** * Created by Administrator on 2015/9/16. */public class ImageZip {    /*   * 压缩图片   * */    public static void zipImage(String savePath) {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeFile(savePath, options);        options.inSampleSize = computeInitialSampleSize(options, 480, 480 * 960);        options.inJustDecodeBounds = false;        Bitmap bitmap = BitmapFactory.decodeFile(savePath, options);        try {            FileOutputStream fos = new FileOutputStream(savePath);            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);            fos.flush();            fos.close();        } catch (IOException e) {            e.printStackTrace();        }        bitmap.recycle();        bitmap = null;        System.gc();    }    public static int computeSampleSize(BitmapFactory.Options options,                                 int minSideLength, int maxNumOfPixels) {        int initialSize = computeInitialSampleSize(options, minSideLength,                maxNumOfPixels);        int roundedSize;        if (initialSize <= 8) {            roundedSize = 1;            while (roundedSize < initialSize) {                roundedSize <<= 1;            }        } else {            roundedSize = (initialSize + 7) / 8 * 8;        }        return roundedSize;    }    private static int computeInitialSampleSize(BitmapFactory.Options options,                                         int minSideLength, int maxNumOfPixels) {        double w = options.outWidth;        double h = options.outHeight;        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math                .sqrt(w * h / maxNumOfPixels));        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(                Math.floor(w / minSideLength), Math.floor(h / minSideLength));        if (upperBound < lowerBound) {            // return the larger one when there is no overlapping zone.            return lowerBound;        }        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {            return 1;        } else if (minSideLength == -1) {            return lowerBound;        } else {            return upperBound;        }    }}

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