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嗨，我正在爲使用顯示度量標準的所有設備做一個應用程序..在2.2版本中，這裏我使用自定義視圖來繪製函數。有時候它的工作很好。我多次學習那個時候我擺脫了內存exception.in emulater我增加了堆的大小，它的工作時間所有fine.how增加堆的大小在舊版本中，什麼我做錯了我的代碼我不明白你可以任何人有想法建議我.....如何在android中以編程方式增加堆大小
公共類A延伸活動{
BitmapDrawable sounddrawable,erasedrawable,backdrwable,fwddrwable,captiondrwable,strtdrwable,stpdrwable;
Bitmap soundbitmap,eraseBitmap,backbitmap,fwdbitmap,captionbitmap,strtbitmap,stpbitmap;
MyView myview;
GlobalClass global;
RelativeLayout.LayoutParams lp6;
SampleView sampleview;
ImageView img;
MediaPlayer nextsound;
boolean count=true;
MediaPlayer mediay2;
ImageView horn;
String user;
int username;
Bundle b;
RelativeLayout relativeLayout,relativeLayout1;
ImageView strtbtn,stpbtn,erase;
float screenHeight,screenWidth,screendensity;
public boolean action=false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
screenHeight = displaymetrics.heightPixels;
screenWidth = displaymetrics.widthPixels;
screendensity = displaymetrics.densityDpi;
Log.i("screenHeight",""+screenHeight);
Log.i("screenWidth",""+screenWidth);
Log.i("screendensity",""+screendensity);
setContentView(R.layout.alh);
int topsampl=(int)(80*(screenHeight/600));
global=(GlobalClass)this.getApplication();
if(sampleview==null)
{
sampleview=new SampleView(this);
}
lp6 = new RelativeLayout.LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
sampleview.setLayoutParams(lp6);
lp6.setMargins(0,topsampl , 0, 0);
relativeLayout=(RelativeLayout)findViewById(R.id.relative);
RelativeLayout.LayoutParams layoutrel= (RelativeLayout.LayoutParams) relativeLayout.getLayoutParams();
layoutrel.height=(int)(600*(screenHeight/600));
ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
int memoryClass = am.getMemoryClass();
Log.v("onCreateAAAAAAAAAA", "memoryClass:" + Integer.toString(memoryClass));
relativeLayout1=(RelativeLayout)findViewById(R.id.relative2);
RelativeLayout.LayoutParams layoutre2= (RelativeLayout.LayoutParams) relativeLayout1.getLayoutParams();
layoutre2.height=(int)(35*(screenHeight/600));
int left=(int)(15*(screenWidth/1024));
int top=(int)(50*(screenHeight/600));
int widthhh=(int)(80*(screenWidth/1024));
int hifhtttt=(int)(50*(screenHeight/600));
ImageView I2=new ImageView(this);
if(captiondrwable!= null) {
captionbitmap.recycle();
captiondrwable= null;
}
if(captiondrwable== null) {
captionbitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.practise));
}
captiondrwable = new BitmapDrawable(captionbitmap);
I2.setBackgroundDrawable(captiondrwable);
RelativeLayout.LayoutParams rlp=new RelativeLayout.LayoutParams(widthhh,hifhtttt);
rlp.setMargins(left, top, 0, 0);
relativeLayout.addView(I2,rlp);
b =getIntent().getExtras();
user=b.getString("k1");
username=Integer.parseInt(user);
Log.i("username..........",""+username);
Log.i("user..........",""+user);
ImageView next=(ImageView)findViewById(R.id.imv1a);
if(fwddrwable!= null) {
fwdbitmap.recycle();
fwddrwable= null;
}
if(fwddrwable== null) {
fwdbitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.next_5011));
}
fwddrwable = new BitmapDrawable(fwdbitmap);
next.setBackgroundDrawable(fwddrwable);
RelativeLayout.LayoutParams layoutnext= (RelativeLayout.LayoutParams) next.getLayoutParams();
layoutnext.height=(int)(35*(screenHeight/600));
layoutnext.width=(int)(50*(screenWidth/1024));
next.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
Log.i("next","..........");
Intent i =new Intent(A.this,Smallletera.class);
i.putExtra("k1", user);
startActivity(i);
if(nextsound==null)
{
nextsound = MediaPlayer.create(getApplicationContext(),R.raw.chime_up);
}
nextsound.start();
if(nextsound!=null)
{
}
}
});
ImageView back=(ImageView)findViewById(R.id.back);
if(backdrwable!= null) {
backbitmap.recycle();
backdrwable= null;
}
if(backdrwable== null) {
backbitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.back1_50));
}
backdrwable = new BitmapDrawable(backbitmap);
back.setBackgroundDrawable(backdrwable);
RelativeLayout.LayoutParams layoutback= (RelativeLayout.LayoutParams) back.getLayoutParams();
layoutback.height=(int)(35*(screenHeight/600));
layoutback.width=(int)(50*(screenWidth/1024));
back.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
Log.i("next","..........");
Intent i =new Intent(A.this,HWindex.class);
startActivity(i);
}
});
if(myview==null)
{
myview = new MyView(this);
}
myview.setBackgroundColor(Color.WHITE);
myview.setId(004);
lp6 = new RelativeLayout.LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
myview.setLayoutParams(lp6);
lp6.setMargins(0,top , 0, 0);
relativeLayout.addView(myview,lp6);
horn=new ImageView(this);
if(sounddrawable!= null) {
soundbitmap.recycle();
sounddrawable= null;
}
if(sounddrawable== null) {
soundbitmap=BitmapFactory.decodeStream(getResources().openRawResource( R.drawable.horn));
}
sounddrawable = new BitmapDrawable(soundbitmap);
horn.setBackgroundDrawable(sounddrawable);
int left1=(int)(830*(screenWidth/1024));
int top1=(int)(50*(screenHeight/600));
int widthhh1=(int)(60*(screenWidth/1024));
int hifhtttt1=(int)(60*(screenHeight/600));
RelativeLayout.LayoutParams hn=new RelativeLayout.LayoutParams(widthhh1,hifhtttt1);
hn.setMargins(left1,top1,0,0);
relativeLayout.addView(horn,hn);
horn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(mediay2==null)
{
mediay2 = MediaPlayer.create(A.this, R.raw.uppercaseinstructions);
}
mediay2.start();
if(mediay2!=null)
{
}
}
});
strtbtn = new ImageView(this);
if(strtdrwable!= null) {
strtbitmap.recycle();
strtdrwable= null;
}
if(strtdrwable== null) {
strtbitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.play_50));
}
strtdrwable = new BitmapDrawable(strtbitmap);
strtbtn.setBackgroundDrawable(strtdrwable);
int left2=(int)(520*(screenWidth/1024));
int top2=(int)(60*(screenHeight/600));
int widthhh2=(int)(40*(screenWidth/1024));
int hifhtttt2=(int)(40*(screenHeight/600));
strtbtn.setId(1);
RelativeLayout.LayoutParams rlp1=new RelativeLayout.LayoutParams(widthhh2,hifhtttt2);
rlp1.setMargins(left2, top2, 0, 0);
relativeLayout.addView(strtbtn,rlp1);
strtbtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(count==true)
{
Log.i("---------dfgdf-----","--------");
relativeLayout.addView(sampleview,lp6);
count=false;
}
}
});
stpbtn=new ImageView(this);
if(stpdrwable!= null) {
stpbitmap.recycle();
stpdrwable= null;
}
if(stpdrwable== null) {
stpbitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.stop_50));
}
stpdrwable = new BitmapDrawable(stpbitmap);
stpbtn.setBackgroundDrawable(stpdrwable);
int left3=(int)(570*(screenWidth/1024));
int top3=(int)(60*(screenHeight/600));
stpbtn.setId(2);
RelativeLayout.LayoutParams rlp2=new RelativeLayout.LayoutParams(widthhh2,hifhtttt2);
rlp2.setMargins(left3, top3,0,0);
relativeLayout.addView(stpbtn,rlp2);
stpbtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if(count==false)
{
Log.i("------stop--------","--");
relativeLayout.removeView(sampleview);
count=true;
}
}
});
erase=new ImageView(this);
if(erasedrawable!= null) {
eraseBitmap.recycle();
erasedrawable= null;
}
if(erasedrawable== null) {
eraseBitmap=BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.eraser_50));
}
erasedrawable = new BitmapDrawable(eraseBitmap);
erase.setBackgroundDrawable(erasedrawable);
int left4=(int)(620*(screenWidth/1024));
int top4=(int)(50*(screenHeight/600));
int widthhh4=(int)(60*(screenWidth/1024));
int hifhtttt4=(int)(60*(screenHeight/600));
RelativeLayout.LayoutParams rlp4=new RelativeLayout.LayoutParams(widthhh4,hifhtttt4);
rlp4.setMargins(left4, top4, 0, 0);
relativeLayout.addView(erase,rlp4);
erase.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try{
mBitmap.eraseColor(android.graphics.Color.TRANSPARENT);
Canvas Canvas=new Canvas(mBitmap);
action=true;
myview.onDraw(Canvas);
}catch(IllegalStateException ie){
ie.printStackTrace();
}
}
}) ;
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(6);
}
private Paint mPaint;
public void colorChanged(int color) {
mPaint.setColor(color);
}
private Bitmap mBitmap;
public class MyView extends View
{
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mBitmap != null) {
mBitmap.recycle();
mBitmap=null;
}
if(mBitmap==null)
{
mBitmap= Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
}
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
Paint painto = new Paint();
painto.setAntiAlias(true);
painto.setColor(getResources().getColor(R.color.magnata));
painto.setStrokeWidth(3);
painto.setStyle(Paint.Style.FILL);
int leftx1=(int)(15*(screenWidth/1024));
int leftx2=(int)(1010*(screenWidth/1024));
int topy1=(int)(60*(screenHeight/600));
int topy2=(int)(530*(screenHeight/600));
canvas.drawLine(leftx1, topy1, leftx2, topy1, painto);
canvas.drawLine(leftx1, topy1, leftx1, topy2, painto);
canvas.drawLine(15, topy2, leftx2, topy2, painto);
canvas.drawLine(leftx2, topy1, leftx2, topy2, painto);
Paint paint1 = new Paint();
paint1.setAntiAlias(true);
paint1.setColor(Color.BLACK);
paint1.setStrokeWidth(3);
paint1.setStyle(Paint.Style.FILL);
paint1.setTextSize(15);
canvas.drawText("Practice writing the letter by tracing it over and over again . ", 110, 40, paint1);
Paint p1=new Paint();
p1.setColor(getResources().getColor(R.color.bcolor));
if(screendensity==160)
{
p1.setTextSize(630);
}
if(screendensity==240)
{
p1.setTextSize(650);
}
p1.setAntiAlias(true);
Typeface font = Typeface.createFromAsset(getAssets(), "font/KINDTRG.TTF");
p1.setTypeface(font);
float lefta=(int)(270*(screenWidth/1024));
float lefta1=(int)(290*(screenWidth/1024));
float lefta2=(int)(320*(screenWidth/1024));
float lefta3=(int)(340*(screenWidth/1024));
float lefta4=(int)(350*(screenWidth/1024));
float lefta5=(int)(370*(screenWidth/1024));
float lefta6=(int)(335*(screenWidth/1024));
float lefta7=(int)(300*(screenWidth/1024));
float lefta8=(int)(265*(screenWidth/1024));
float topa=(int)(505*(screenHeight/600));
float topa1=(int)(520*(screenHeight/600));
float topa2=(int)(510*(screenHeight/600));
float topa3=(int)(500*(screenHeight/600));
float topa4=(int)(495*(screenHeight/600));
float topa5=(int)(490*(screenHeight/600));
if(username==1)
{
canvas.drawText("A", lefta, topa, p1);
}
if(username==2)
{
canvas.drawText("B", lefta, topa, p1);
}
if(username==3)
{
canvas.drawText("C", lefta, topa, p1);
}
if(username==4)
{
canvas.drawText("D", lefta, topa1, p1);
}
if(username==5)
{
canvas.drawText("E", lefta3, topa1, p1);
}
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
if(action)
{
invalidate();
}
} private float mX, mY;
private float TOUCH_TOLERANCE = 2;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
private void touch_up() {
mPath.lineTo(mX, mY);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
}
}
public void clearAllResources() {
// Set related variables null
System.gc();
Runtime.getRuntime().gc();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
protected void onDestroy() {
super.onDestroy();
unbindDrawables(findViewById(R.id.relative));
System.gc();
}
private void unbindDrawables(View view) {
if (view.getBackground() != null) {
view.getBackground().setCallback(null);
}
if (view instanceof ViewGroup) {
for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
unbindDrawables(((ViewGroup) view).getChildAt(i));
}
((ViewGroup) view).removeAllViews();
}
}
protected void onstop() {
clearAllResources();
super.onStop();
}
class SampleView extends View {
java.io.InputStream is;
private Movie mMovie;
private long mMovieStart;
private byte[] streamToBytes(InputStream is) {
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int len;
try {
while ((len = is.read(buffer)) >= 0) {
os.write(buffer, 0, len);
}
} catch (java.io.IOException e) {
}
return os.toByteArray();
}
public SampleView(Context context) {
super(context);
setFocusable(true);
if(global.bugcount==1)
{
is = context.getResources().openRawResource(R.drawable.a);
}
if(global.bugcount==2)
{
is = context.getResources().openRawResource(R.drawable.b);
}
if(global.bugcount==3)
{
is = context.getResources().openRawResource(R.drawable.c);
}
if(global.bugcount==4)
{
is = context.getResources().openRawResource(R.drawable.d);
}
if(global.bugcount==5)
{
is = context.getResources().openRawResource(R.drawable.e);
}
if (true) {
mMovie = Movie.decodeStream(is);
} else {
byte[] array = streamToBytes(is);
mMovie = Movie.decodeByteArray(array, 0, array.length);
}
}
@Override protected void onDraw(Canvas canvas) {
Paint p = new Paint();
p.setAntiAlias(true);
long now = android.os.SystemClock.uptimeMillis();
if (mMovieStart == 0) { // first time
mMovieStart = now;
}
if (mMovie != null) {
int dur = mMovie.duration();
if (dur == 0) {
dur = 1000;
}
int relTime = (int)((now - mMovieStart) % dur);
mMovie.setTime(relTime);
mMovie.draw(canvas, getWidth() - mMovie.width(),
getHeight() - mMovie.height());
invalidate();
}
}
}
@Override
protected void onPause() {
if (mediay2 != null){
mediay2.stop();
mediay2.release();
mediay2=null;
}
if(nextsound != null) {
if (nextsound.isPlaying()) {
nextsound.stop();
}
nextsound.release();
nextsound = null;
}
clearAllResources();
super.onPause();
}
}
i am getting exception in inside myview on sizechnage()....