Android面授班一單元機試答案.doc

1、 現(xiàn)場得分題:1、 配置java環(huán)境變量，cmd下輸入javac得到相關(guān)指令得分。（5）參考答案：Step1 安裝JDK,并記錄其安裝目錄Step1 鼠標(biāo)右鍵單擊我的電腦-屬性（win7-高級系統(tǒng)設(shè)置）打開系統(tǒng)屬性面板Step2 選中高級選項卡-環(huán)境變量Step3 在系統(tǒng)環(huán)境變量中增加JAVA_HOME其值為JDK的安裝目錄Step4 在修改系統(tǒng)環(huán)境變量中的path在其前端添加%JAVA_HOME%bin;Step5 在系統(tǒng)環(huán)境變量中增加classpath其值為%JAVA_HOME%jrelibrt.jar;.;2、 用記事本編寫HelloWorld.java編譯運行后可在cmd下輸出HelloWorld.（5）參考答案：step1:創(chuàng)建HelloWorld.java文件并編寫如下內(nèi)容：public class HelloWorldpublic static void main(Stringargs) System.out.println(“HelloWorld”); step2:打開cmd-javac HelloWorld.javastep3: java HelloWorld3、 在cmd下創(chuàng)建、編譯、運行android項目，在模擬器上輸出HelloAndroid（10）step1 分別將sdk下的tools,platform-tools及ant下的bin目錄配至系統(tǒng)環(huán)境變量的path中step2 cmd-android list targets 得到android2.2的編號step3 android create project -target -name MyFirstApp -path /MyFirstApp -activity MainActivity -package com.example.myfirstappstep3 進(jìn)入項目的根目錄執(zhí)行ant debugstep4 adb install bin/MyFirstApp-debug.apk2、 單元項目核心功能題：1、 使用MediaPlayer播放raw/a.mp3文件。(5)參考答案：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)參考答案：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的播放進(jìn)度，SeekBar可實時顯示MediaPlayer的進(jìn)度得分。(15)參考答案：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控制并實時顯示播放進(jìn)度，有畫面，SeekBar功能完整得分(15)參考答案：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實現(xiàn)圖片放大縮小旋轉(zhuǎn)，要求縮小時圖片居中，放大時可以通過滾動看到圖片全景得分。(15)參考答案：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、 自定義錄象機，錄制一段視頻至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、 作業(yè)邏輯回顧題編寫Java項目，在cmd下實現(xiàn)斗地主的洗牌，發(fā)牌。(15)參考答案：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,紅,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,