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゜掛Android及頗゜詢淏痔

゜掛插紳餃娶棗勳餃及頗/゜詢淏痔 2010/10/10 1

? ゜詢淏痔ㄗ夫分井引今夫欠ㄘ
? ゜掛Android及頗ㄞ憝昹盓窒
? Android嶱逃ロ�扔奶玄 Tech Booster 綅�
http://techbooster.jpn.org/
65�岈毛閉尹化筥卞3掛矢奈旦匹�硈笢ㄐ

Twitter
Account
@mhidaka


1. Android午必奈丞
? 衙猁ㄞ旦伊永玉�傖ㄞ蛁砩萸

2. 必奈丞匹及鏡賒
? SurfaceViewㄞ媆炵蹈�I燴

3. 丟乒伉奪燴
? GCㄞOOMㄞ復悵及源楊

4. 引午戶


交奈扒极歠ㄩ※凶及仄中ㄐ§及凶戶卞﹝
? Android穴奈弗永玄匹Game反2楓醴及�𠸎
? 方曰詢厒卞﹜方曰苤今仁ㄐ湮五中必奈丞反失件奶件旦玄奈伙今木支允中

交奈扒伊旦禾件旦
? �I燴卞反偶俋媆嶲互井井月手及手嗣中﹝�六源毛馱痲﹝
? 瞰ㄩ�I燴笢匹丐木壬旦疋瓜奈/皿伕弘伊旦田奈匹籵眭允月
? 生永玄伐奈弁失弁本旦ㄗ仿奶本件旦扔奈田午及籵陓卅升ㄘ
? 旦戊失及悵湔支犯奈正及田永弁失永皿卅升


犯奈乒件旦伊永玉ㄕ
扑件弘伙?旦伊永玉?乒犯伙
交奈扒旦伊永玉

? Main旦伊永玉ㄗUI Thread ? 交奈扒旦伊永玉ㄩ
? Activity卞憝允月�I燴 �I燴互皺歹月(return)引匹
? 仿奶白扔奶弁伙皿伕弘仿丞反皺賸匹五卅中

? onCreateㄞOnPause ? 犯奈乒件旦伊永玉ㄩ
皿伕弘仿丞皺賸媆卞旦伊永
? 跪UI由奈汁(View卅升) 玉及灍俴皺賸毛渾凶卅中
及鏡賒�I燴


鏡賒?伕斥永弁?UI匹旦伊永玉煦賃
? 鏡賒/CPU�I燴卅升匹𡛟湘綈晊毛滅什
UI
? 正旦弁及梩衄反ANR及�砓(Application ? ⻌薯﹜伊旦禾件旦

Not Responding) ? Activity及�I燴

? 伉失伙正奶丞必奈丞匹丐木壬賒醱尺及交奈扒⻌薯
30FPS互燴砑白奴奈玉田永弁 TimerEvent
? 蔚］卅升CPU互氏壬月炵及必奈丞
logic湮岈ㄗAndroid2.2及JITˋㄘ弘仿白奴永弁 logic
? 賒砉�I燴﹜巨白尼弁玄 ? 必奈丞及�燴�婖
? 正永民奶矛件玄鵁太綎亢 ? SurfaceView ? 剠癹伙奈皿
onTouchEvent及笢匹Sleep允月
賒砉�I燴


? AsyncTask 丟末永玉靡囀⺍
onPreExecute() 岈ゴ𨃨�及�I燴毛�扴允月
? 準肮ヽ�I燴 doInBackground(Params...) 田永弁弘仿它件玉匹俴丹�I燴毛�扴允月
onProgressUpdate(Progress...) 筳𠜎袨暿毛UI旦伊永玉匹桶尨允月�I燴毛�扴允月

onPostExecute(Result) 田永弁弘仿它件玉�I燴互俇賸仄﹜UI旦伊永玉卞毀茬允
月�I燴毛�扴允月

public class MonochromeTask extends AsyncTask<Bitmap, Integer, Bitmap> {

@Override
protected Bitmap doInBackground(Bitmap... bitMap) {
Bitmap outBitMap = bitMap[0].copy(Bitmap.Config.ARGB_8888, true);

? Runnable,Thread
? Java穴伙民旦伊永玉�I燴ㄗ肮ヽ﹜�珂僅秶郘etcㄘ互褫夔
? Runnable奶件正奈白尼奶旦﹜Thread弁仿旦﹝丐午匹賤掊仄引允


Android傷藺及奶件正奈白尼奶旦
? 平奈示奈玉﹜正永民由生伙﹜本件扔奈﹜甩奈玉平奈

辻意互嗣中及匹砑隅互褣仄中
正永民由本件
? 旦穴奈玄白巧件? TV ? 正皮伊永玄? 生伙扔奈

? 云允允戶反奶件正奈白尼奶旦及劐平奈甩奈玉
示奈玉奶件正奈平奈
𡥼窒毛厥勾仇午白尼奶旦
? 嶱逃互筳氏匹井日匹OK 劐𡥼

? 交奈扒?辻け卞磁歹六凶偞隅
input
劐載互��g卞
logic


Canvas
? 鏡賒卞井井歹月�I燴毛允屯化UI旦伊永玉匹俴丹
? 眕狟及2勾卞掀屯月午腴厒分仃升��g

SurfaceView
? 栳呾毛�e旦伊永玉匹灍囥仄化UI旦伊永玉匹鏡賒
? Canvas午SurfaceView反CPU�I燴

GLSurfaceView
? OpenGL毛妏勻凶鏡賒�I燴毛俴丹﹝準都卞詢厒﹝
? 甩奈玉它尼失�I燴﹜辻意甡湔互嗣屾丐月及匹蛁砩﹝華沬﹝


SurfaceView
? 賒醱(Surface)毛鏡賒允月�蚚旦伊永玉毛枑鼎允月
ㄗ揃埭伕永弁互逃汜ㄘ
? 鏡賒卞反﹜SurfaceHolder午中丹奶件正奈白尼奶旦毛瞳蚚

灍蚾
? 鏡賒�I燴反SurfaceHolder及戊奈伙田永弁午仄化灍蚾允月
? SurfaceHolder.Callback.surfaceCreated()
? SurfaceHolder.Callback.surfaceChanged()
? SurfaceHolder.Callback.surfaceDestroyed()


插釵喧勳措勳喧聆卞博勳梗滄毛扢隅
public class surfaceViewActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new sampleSurfaceView(this));
}
}

SurfaceView及戊件旦玄仿弁正
private Bitmap mImage;
//戊件旦玄仿弁正
public sampleSurfaceView(Context context) {
super(context);

getHolder().addCallback(this);
mImage = BitmapFactory.decodeResource(getResources(),
R.drawable.bakeneko);
}

SurfaceView汜傖logic
//SurfaceView汜傖媆卞網太堤今木月
public void surfaceCreated(SurfaceHolder holder) {
//場ヽ鏡賒(汜傖正奶立件弘匹鏡賒允月斛猁互丐月手及)
//Canvas及龰腕(穴伙民旦伊永玉虐噫�𡛟及凶戶Lock)
Canvas canvas = holder.lockCanvas();
Paint paint = new Paint();
paint.setTextSize(24);
paint.setColor(Color.WHITE);

//鏡賒�I燴(Lock笢卅及匹卅月屯仁婌仁)
canvas.drawBitmap(mImage, 0, 0, paint);
canvas.drawText("TechBooster",0,200,paint);

//Lock仄凶Canvas毛賤溫﹜幻井及鏡賒�I燴旦伊永玉互丐木壬公切日卞﹝
holder.unlockCanvasAndPost(canvas);
}


Runnable奶件正奈白尼奶旦
? 交奈扒旦伊永玉及釬傖﹝�e旦伊永玉匹媆嶲﹜痄�講毛𢜪隅
public class sampleSurfaceView extends SurfaceView
implements SurfaceHolder.Callback, Runnable{
private Thread mLooper;
(吽謹)
}

//SurfaceView劐載媆卞網太堤今木月
//SurfaceView汜傖媆卞網太堤今木月
public void surfaceChanged(SurfaceHolder holder, int{format, int width, int height) {
public void surfaceCreated(SurfaceHolder holder)
//旦伊永玉�I燴毛嶱宎
if(mLooper != null ){
//旦伊永玉及汜傖
mHolder = holder;
mLooper.start();
} mLooper = new Thread(this);
} }


? Runnable奶件正奈白尼奶旦及Run丟末永玉
//旦伊永玉卞方月SurfaceView載陔�I燴
public void run() {
while (mLooper != null) {

//鏡賒�I燴
doDraw();

//弇离載陔�I燴
//�I燴邈切卞方月旦伕奈乒奈扑亦件毛今仃月凶戶政婓媆覦毛龰腕
long delta = System.currentTimeMillis() - mTime;
mTime = System.currentTimeMillis();

//棒及鏡賒弇离
int nextPosition = (int)( ( delta / 1000.0 ) * 200 ); //1鏃嶲卞200px�仁午仄化

//鏡賒��及偞隅
if(mPositionTop + nextPosition < mHeight ){
mPositionTop += nextPosition;
}
(吽謹)
}
}


? 測桶腔卅伊奶失它玄反ㄣ勾


? FrameLayout匹奻井日鏡賒毛笭友月

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

FrameLayout frameLayout = new FrameLayout(this);
setContentView(frameLayout);

frameLayout.addView(new sampleSurfaceView(this),new
ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));

//扔件皿伙桶尨蚚及示正件毛釬傖
Button button = new Button(this);
button.setText("Start Button");
frameLayout.addView(button, new
ViewGroup.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
}


布矛奈斥戊伊弁扑亦件
? JavaHeap互逋曰卅仁卅月午丟乒伉復悵及凶戶GC互軗月
? 珨僅GC允月午100~200ms反必奈丞互砦引月

05-14 17:43:25.916: DEBUG/dalvikvm(51):
GC freed 637 objects / 29528 bytes in 86ms

Activity互丟乒伉毛妘中勾少允
? 瞳蚚褫夔卅丟乒伉反24MB﹝井卅日內仇及��卞�戶月

OutOfMemoryError
? GC卞方月丟乒伉?失伕弗奈扑亦件媆﹝
JavaHeap囀匹﹜猁А扔奶朮煦及諾五互剠仃木壬逃汜

05-14 17:16:45.035: INFO/ActivityManager(51): Config changed:
{ scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/2 nav=3/1
orien=1 layout=18}
05-14 17:16:45.075: ERROR/dalvikvm-heap(187): 2457600-byte external
allocation too large for this process.
05-14 17:16:45.075: ERROR/(187): VM won't let us allocate 2457600
bytes＃吽謹＃
05-14 17:16:45.204: ERROR/AndroidRuntime(187):
java.lang.OutOfMemoryError: bitmap size exceeds VM budget

? Android及丟乒伉反�𢶷匹反卅中
? 赻煦互妏丹丟乒伉講毛�呾允月
? 伉失伙正奶丞必奈丞匹反
嶱宎ゴ卞�窒及犯奈正毛掂心煋戈午中中﹝
? 穴永皿犯奈正﹜扑瓜伉左﹜秞汒﹜平乓仿弁正奈卅升卅升﹝
? 丟乒伉伉奈弁卞𠸎毛勾仃月
? 砩�六內左皮斥尼弁玄互賤溫今木卅仁化丟乒伉毛挍勻凶引引卞
卅月仇午手﹝
? 忒勻龰曰婌中及反DDMS匹丟乒伉講毛復庲﹝
由白巧奈穴件旦�䛐反Log.d支TraceView手云允允戶﹝


交奈扒奶件正奈白尼奶旦
? 伊旦禾件旦毛湮岈卞﹝⻌薯犯田奶旦毛腢屯月方丹卞﹝
? 必奈丞伕斥永弁毛煦賃仄化穴伙民旦伊永玉趙

View
? 鏡賒反必奈丞杻俶卞磁歹六化郔羥卅手及毛﹝
? 示奈玉必奈丞ㄩCanvas﹜伉失伙正奶丞炵ㄩOpenGL/SurfaceView

丟乒伉奪燴
? GC互軗月午必奈丞反砦引月
? 丟乒伉妏蚚講毛參挍允月﹜伉奈弁反DDMS/MAT卅升匹復庲


? 仍ラ�丐曰互午丹仍介中引仄凶


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