黑马程序员android多媒体相关延迟意图

音频Media生命周期，参考Media yer文档；<uses-permissionandroid:name="android.permission.READ_EXTERNAL_STORAGE"<uses-permissionandroid:name="android.permission.READ_PHONE_STATE"<uses-permission*音频器示例，注publicclassMainActivityextendsActivity/**进度条privateSeekBar/**类privateMedia yermediayer;privateImageButtonyBT;privateProgressDialogdialog;protectedvoidonCreate(BundlesavedInstanceState){musicSB=(SeekBar)findViewById(R.id.musicSB);yBT=(ImageButton)findViewById(R.id.yBT);//==服务 ephonyManager=(ephonyManager) ephonyManager.listen(newMyPhoneSta }//==退出按钮调用销毁方法==protectedvoidonDestroy()if yer!=null)mediayer.stop(); //停止音乐mediayer.release(); //释放资源mediayer=null;}}//==方法public y(Viewv)if yer==null)try yer=new // yer= yer.create(context, yUrl=String.format("%s/%s",Environment.getExternalStorageDirectory(),"daqin.mp3"); //音频路径，本地 yUrl=" //设置为音频 //准备，在主 加载文 //推荐使用，异步准备，在新线程加载文 //准备好，准备好//显示加载}catch(Exceptione){}}elseif(media ying()) //暂}else //继}//==设置按钮图标== ying()?android.R.drawable.ic_media_pause:android.R.drawable.ic_media}//==显示加载dialogprivatevoidshowDialog()dialog=newProgressDialog(this);}/* 相关//==准备完毕实现类privateclassMyPreparedListenerimplementsOnPreparedListenerpublicvoidonPrepared(Media yermp){ //准new //启MySeekBarChangeListener());//}

}//==状态privateclass istenerextends istenerprivateboolean //是否暂publicvoidonCallStateChanged(intstate, if(mediayer!=null)switch(state)case //来电了，停if(media ying()){ isPause=true;}caseif(isPause //如果是来电导致的暂停，则继 isPause=false;}} yer.isying()android.R.drawable.ic_media_pause:android.R.drawable.ic_media}}}//== yer完成类private pletionListener public yermp)if yer!=null) //停止音乐 //释放资源 yer=null; //回收 //还原进度条}}}//==SeekBar进度条实现类privateclassMySeekBarChangeListenerimplementsOnSeekBarChangeListenerpublicvoidonStopTrackingTouch(SeekBarseekBar)if yer!=null) //把器调整到进条的位}}publicvoidonStartTrackingTouch(SeekBarseekBar)publicvoidonProgressChanged(SeekBarseekBar,intprogress,booleanfromUser)}/* 相关/* 线程相关//==启用新的线程，显示进度privateclassSeekBarThreadextendsThreadpublicvoidrun() //获取音频文件的时长，设置到while yer!=null) if(mediayer.is ying()&&!musicSB.isPressed()){ //设置SeekBar}try}catch(InterruptedExceptione){}}}}/* 线程相关}应用场如果使用Media yer每次加载音频、、再释放，这样很费事；我们可以使用音频池加载多个音频，需要哪个就直接；代码实intidpool.load(thisR.raw.jiaodizhu1);//异步加载,需要一点时pool.y(id,1,1,0,0,1); //音频id,左音量,右音量,优先级,是否重复,SurfaceView使用Mediayer来，SurfaceView来展示；位置，转到前台时，再从指定的位置；添加器，来实现摧毁和重构的；onCreate准备完毕新增（seeko：拍照需限<uses-permissionandroid:name="android.permission.CAMERA"<uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"打开头SDK2.3之后支持前置头，open方法可以接收一个int参数，用来指定哪个头注意SurfaceView不端显示的时候会被销毁，恢复之后会重绘，需其，创建与销毁；注意拍照之后头不回自动回到预览状态，需要重写调用startPreview()方法；publicclassMainActivityextendsActivity{privateSurfaceViewpreviewSV;privateCamerac;protectedvoidonCreate(BundlesavedInstanceState){previewSV=(SurfaceView)findViewById(R.id.previewSV); previewSV.getHolder().addCallback(newMyCallback()); }//==SurfaceView的重构和摧毁privateclassMyCallbackimplementsCallbackpublicvoidsurfaceCreated(SurfaceHolderholder) //打开头，准备预c=Camera.open();Parametersparameters //获取默认参 //设 大 //设 质 //闪光灯 到try

//设置预览显示位}catch(IOExceptione){}}publicvoidsurfaceDestroyed(SurfaceHolderholder) //停止预览，释放if(c!=null) //停止预览 //释放资源c=null;}}publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)}}/*拍照publicvoidtake(Viewv)//==自动对焦==c.autoFocus(newAutoFocusCallbackpublicvoidonAutoFocus(booleansuccess,Cameracamera) 数据生参数 akePicture(null,null,newPictureCallback()publicvoidonPictureTaken(byte[]data,Cameracamera){StringfilePath=getStoreFilePath();tryOutputStreamos=newFileOutputStream(filePath); }catch(Exceptione){}

}

privateStringgetStoreFilePath()if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))returnEnvironment.getExternalStorageDirectory()+"/"+System.currentTimeMillis()+".mp4";}}}2.2需<uses-permissionnewsetAudioSource(int设 setOutputFormat(intsetAudioEncoder(int设 y(SurfacesetOutputFile(StringpublicclassMainActivityextendsActivityprivateImageButtontakerIB;privateSurfaceViewpreviewSV;privateCamerac;privateMediaRecorderrecorder;protectedvoidonCreate(BundlesavedInstanceState)takerIB=(ImageButton)findViewById(R.id.takeIB);previewSV.getHolder().addCallback(newMyCallback()); //}//==SurfaceView的重构和摧毁privateclassMyCallbackimplementsCallbackpublicvoidsurfaceCreated(SurfaceHolderholder) //打开头，准备览try

c= //设置预览显示位 //预}catch(IOExceptione){}}publicvoidsurfaceDestroyed(SurfaceHolderholder 头if(c!=null) //停止预 //释放资c=}}publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)}}//==按钮点击方法==publicvoidtake(Viewv)throwsExceptionif(recorder==null) //recorder=newMediaRecorder();

));//视 //准 //开始录}else //停止录 //停 //释recorder=null;}}/**获取存取路径，优先SD卡@returnprivateStringgetStoreFilePath()if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))returnEnvironment.getExternalStorageDirectory()+"/"+System.currentTimeMillis()+".mp4";}}}使用系统的头应//==照相使用系统的头应用，不需要配置权限publicvoidtakeImage(Viewv)Intentintent=newIntent(MediaStore.ACTION_IMAGE_CAPTURE);System.currentTimeMillis()+".jpg"));startActivityForResult(intent,100);}//==publicvoid (Viewv)Intentintent=newIntent(MediaStore.ACTION_CAPTURE);System.currentTimeMillis()+".mp4")); startActivityForResult(intent,200);}activity关闭返回调用方法==protectedvoidonActivityResult(intreqode,intresultCode,Intentdata){Intentintent=newIntent(Intent.ACTION_VIEW);switch(resultCode)case //拍intent.setDataAndType(imageUri,"image/*"); //使用系统默认的工具打开case // Uri," }}/**获取存取路径，优先SD卡@returnprivateStringgetStoreFilePath()if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))returnEnvironment.getExternalStorageDirectory()+}returngetFilesDir()+}获取图库中的Intentintent=newIntent();startActivityForResult(intent,100);protectedvoidonActivityResult(int ode,intresultCode,Intentdata)if(data!=null&&reqode==100)Uriuri=data.getData(); //获取图库中被选中文件的UriStringpath=getAbsolutePath(uri); //根据Uri获取绝对路径Bitmapbm //根据路径获取一个Bitmap(已缩放，避ImageViewimageView=(ImageView)findViewById(R.id.imageView);}}UriprivateStringgetAbsolutePath(Uriuri)Cursorc=getContentResolver().query(uri,new{MediaStore.Images.Media.DATA},null,null,null);return}加载大在大多数的Android中，每个应用程序可以使用的内存被限制在在加载的时候，按屏幕大小对进行缩放，既不影响显示效果，又节省了内存；privateBitmapgetUsableImage(Stringpath)Optionsopts=newOptions(); //选项对象(在加载时使用)opts.inJustDecodeBounds=true; //修改选项,只获取大小（没有全部加载到内存中，的2进制数据中，会有的一些信息BitmapFactory.decodeFile(path, //加载(只得到大小WindowManagermanagerWindowManager)getSystemService(WINDOW_SERVICE);//获取窗体管理器intscaleX=opts.outWidth/ is//X轴缩放比例(宽度/屏幕宽度intscaleY=opts.outHeight/ Y轴intscale=scaleX>scaleY?scaleX://的缩放比例(X和Y哪个大选哪个opts.inJustDecodeBounds=false; //修改选项,不只 opts.inSampleSize=scale>1?scale:1; //修改选项,加载 //加载(得到缩放后的}获取Exif信息（的一些信息ExifInterfaceexif=newExifInterface("/mnt/sdcard/test.jpg"); //拍摄时间 //拍摄设备 //制造商 //方向System.out.println(exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE));//