Android面授班一单元机试答案.doc

1、 现场得分题:1、 配置java环境变量，cmd下输入javac得到相关指令得分。（5）参考答案：Step1 安装JDK,并记录其安装目录Step1 鼠标右键单击我的电脑-属性（win7-高级系统设置）打开系统属性面板Step2 选中高级选项卡-环境变量Step3 在系统环境变量中增加JAVA_HOME其值为JDK的安装目录Step4 在修改系统环境变量中的path在其前端添加%JAVA_HOME%bin;Step5 在系统环境变量中增加classpath其值为%JAVA_HOME%jrelibrt.jar;.;2、 用记事本编写HelloWorld.java编译运行后可在cmd下输出HelloWorld.（5）参考答案：step1:创建HelloWorld.java文件并编写如下内容：public class HelloWorldpublic static void main(Stringargs) System.out.println(“HelloWorld”); step2:打开cmd-javac HelloWorld.javastep3: java HelloWorld3、 在cmd下创建、编译、运行android项目，在模拟器上输出HelloAndroid（10）step1 分别将sdk下的tools,platform-tools及ant下的bin目录配至系统环境变量的path中step2 cmd-android list targets 得到android2.2的编号step3 android create project -target -name MyFirstApp -path /MyFirstApp -activity MainActivity -package com.example.myfirstappstep3 进入项目的根目录执行ant debugstep4 adb install bin/MyFirstApp-debug.apk2、 单元项目核心功能题：1、 使用MediaPlayer播放raw/a.mp3文件。(5)参考答案：public class MainActivity extends ActivityOverridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); MediaPlayer.create(this, R.raw.a).start();2、 使用MediaPlayer播放sdcard下的a.mp3文件(5)参考答案：public class MainActivity extends ActivityOverridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); MediaPlayer player=new MediaPlayer(); try player.setDataSource(“mnt/sdcard/a.mp3”); player.prepare(); player.start(); catch(Exception e)3、 使用SeekBar控制MediaPlayer的播放进度，SeekBar可实时显示MediaPlayer的进度得分。(15)参考答案：part1: main.xml part2:MainActivity.javapublic class TestTestActivity extends Activity /* Called when the activity is first created. */MediaPlayer player=new MediaPlayer();SeekBar seek; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); seek=(SeekBar)findViewById(R.id.seek); try player.setDataSource(mnt/sdcard/a.mp3); player.prepare(); player.start(); seek.setMax(player.getDuration(); catch(Exception e) new Thread() Override public void run() while(player.isPlaying() seek.setProgress(player.getCurrentPosition(); .start(); seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() Overridepublic void onStopTrackingTouch(SeekBar seekBar) Overridepublic void onStartTrackingTouch(SeekBar seekBar) Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) if(fromUser)player.seekTo(progress);); 4、 使用SurfaceView+MediaPlayer播放sdcard下ywsy.3gp要求用SeekBar控制并实时显示播放进度，有画面，SeekBar功能完整得分(15)参考答案：part1 main.xml part2: MainActivity.javapublic class TestTestActivity extends Activity implements SurfaceHolder.Callback /* Called when the activity is first created. */MediaPlayer player=new MediaPlayer();SurfaceView sf;SurfaceHolder sh;SeekBar seek; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); seek=(SeekBar)findViewById(R.id.seek); sf=(SurfaceView)findViewById(R.id.sf); sh=sf.getHolder(); sh.addCallback(this); sh.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() Overridepublic void onStopTrackingTouch(SeekBar seekBar) Overridepublic void onStartTrackingTouch(SeekBar seekBar) Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) / TODO Auto-generated method stubif(fromUser)player.seekTo(progress);); Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) Overridepublic void surfaceCreated(SurfaceHolder holder) try player.setDataSource(mnt/sdcard/a.mp3); player.prepare(); player.start(); player.setDisplay(sh); seek.setMax(player.getDuration(); catch(Exception e) new Thread() Override public void run() while(player.isPlaying() seek.setProgress(player.getCurrentPosition(); .start();Overridepublic void surfaceDestroyed(SurfaceHolder holder) 5、 使用ImageView实现图片放大缩小旋转，要求缩小时图片居中，放大时可以通过滚动看到图片全景得分。(15)参考答案：part1 main.xml part2 MainActivity.javapublic class TestTestActivity extends Activity /* Called when the activity is first created. */ImageView image;Bitmap bitmap;float scale=1,rote=0;Matrix matrix=new Matrix(); Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); image=(ImageView)findViewById(R.id.image); bitmap=BitmapFactory.decodeFile(mnt/sdcard/a.jpg); image.setImageBitmap(bitmap); public void toBig(View view)zoomChange(1.2f,0); public void toSmall(View view)zoomChange(0.8f,0); public void rotLeft(View view)zoomChange(1,-15); public void rotRight(View view)zoomChange(1,15); public void zoomChange(float s,float r) scale*=s;rote+=r; matrix.postRotate(rote); matrix.postScale(scale, scale); Bitmap bm=Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(),matrix,true); image.setImageBitmap(bm); 6、 自定义录象机，录制一段视频至sdcard下的test.mp4文件中。(10)part1: Manifest.xml part2 main.xml part3 MainActivity.javapublic class MainActivity extends Activity implements SurfaceHolder.Callback /* Called when the activity is first created. */SurfaceView sf;SurfaceHolder sh;MediaRecorder mr=new MediaRecorder(); Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); sf=(SurfaceView)findViewById(R.id.sf); sh=sf.getHolder(); sh.addCallback(this); sh.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) / TODO Auto-generated method stubOverridepublic void surfaceCreated(SurfaceHolder holder) / TODO Auto-generated method stub/step1./step2mr.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); mr.setVideoSource(MediaRecorder.VideoSource.CAMERA); /step3 mr.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mr.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); mr.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT); /step4 mr.setOutputFile(mnt/sdcard/heapow1201.mp4); /step5 mr.setPreviewDisplay(sh.getSurface(); try mr.prepare(); catch(Exception e) finish(); Overridepublic void surfaceDestroyed(SurfaceHolder holder) / TODO Auto-generated method stubmr.release();public void start(View view)mr.start();public void stop(View view)mr.stop();3、 作业逻辑回顾题编写Java项目，在cmd下实现斗地主的洗牌，发牌。(15)参考答案：public class P3 public static void main(String args) / TODO Auto-generated method stubintpkCode=new int54;for(int i=0;i54;i+)pkCodei=i;Stringcolor=方,梅,红,黑;Stringnum=3,4,5,6,7,8,9,10,J,Q,K,A,2;intpk=new int54;for(int i=0;ipk.length;i+)int index=(int)(Math.random()*(pk.length-i);pki=pkCodeindex;remove(pkCode,index);intpk1=new int17;intpk2=new int17;intpk3=new int17;intdz=new int3;System.arraycopy(pk, 0, pk1, 0, 17);System.arraycopy(pk, 17, pk2, 0, 17);System.arraycopy(pk, 34, pk3, 0, 17);System.arraycopy(pk, 51, dz,