GoogleはGoogleマップの画像をどのように拡大縮小しますか。Googleマップの代わりにカスタムマップを使用するアプリケーションを作成しようとしています。すべてがうまく機能しているので、サイズが240 x 320を超える電話ではそれに応じて画像を拡大縮小できませんが、これよりも大きいサイズの電話では、Androidのアプリのデフォルトのヒープサイズを超えてJavaを取得するため、クラッシュします.lang.OutOfMemoryError:ビットマップサイズがVMバジェットを超えています。電話の解像度に応じて画像をどのように拡大縮小すればよいかわかりません。
これがやっていることです:
1)最初に電話の幅と高さを計算しています:
Display display = getWindowManager().getDefaultDisplay();
Constatnts.SCR_WD = display.getWidth();
Constatnts.SCR_HT = display.getHeight();
2)ズームアウト関数を呼び出すzoomInボタンのonclicklistenerを設定しました:
public void zoomOut() {
if (isloading > 5)
return;
System.gc();
if (zoomLevel < 12) {
dc = true;
sc = true;
emptyBuffer();
zoom = -1;
stopload = true;
bitmapArr1 = new Bitmap[tilesyno][tilesxno];
for (int i = 0; i < bitmapArr.length; i++) {// row
for (int j = 0; j < bitmapArr[i].length; j++) {// coloum
if (bitmapArr[i][j] != null) {
int tmpTilewd = bitmapArr[i][j].getWidth() / 2;
int tmpTileHt = bitmapArr[i][j].getHeight() / 2;
Bitmap b = ExtraFunctions.ScaleBitmap(bitmapArr[i][j],
tmpTilewd, tmpTileHt);
if (bitmapArr1 != null)
bitmapArr1[i][j] = b;
}
}
}
lastPressed1 = System.currentTimeMillis();
setCenterLatLon();
zoomLevel++;
if (!isStarted)
tryLoadMap();
}
}
void tryLoadMap() {
if (isStarted)
return;
isStarted = true;
Thread th = new Thread() {
public void run() {
try {
Thread.sleep(System.currentTimeMillis() - lastPressed1);
} catch (InterruptedException e) {
e.printStackTrace();
}
loadLocalMap();
if (showDirection)
DirectionPath(lat, lon);
if (isSearchAvail)
SearchPath(lat, lon, tmpselected);
isStarted = false;
}
};
th.start();
}
スケーリングの場合:
public static Bitmap ScaleBitmap(Bitmap bitmapOrg,int newWidth,int newHeight) {
if(bitmapOrg==null)
return null;
int width = bitmapOrg.getWidth();
int height = bitmapOrg.getHeight();
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
//matrix.postRotate(45);
// recreate the new Bitmap
return Bitmap
.createBitmap(bitmapOrg, 0, 0, width, height, matrix, true);
}
LOgcat:
08-30 17:09:30.342: E/dalvikvm-heap(440): 1451808-byte external allocation too large for this process.
08-30 17:09:30.382: E/GraphicsJNI(440): VM won't let us allocate 1451808 bytes
08-30 17:09:30.382: D/AndroidRuntime(440): Shutting down VM
08-30 17:09:30.401: W/dalvikvm(440): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-30 17:09:30.442: E/AndroidRuntime(440): FATAL EXCEPTION: main
08-30 17:09:30.442: E/AndroidRuntime(440): java.lang.IllegalStateException: Could not execute method of the activity
08-30 17:09:30.442: E/AndroidRuntime(440): at android.view.View$1.onClick(View.java:2072)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.view.View.performClick(View.java:2408)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.view.View$PerformClick.run(View.java:8816)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.os.Handler.handleCallback(Handler.java:587)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.os.Handler.dispatchMessage(Handler.java:92)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.os.Looper.loop(Looper.java:123)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-30 17:09:30.442: E/AndroidRuntime(440): at java.lang.reflect.Method.invokeNative(Native Method)
08-30 17:09:30.442: E/AndroidRuntime(440): at java.lang.reflect.Method.invoke(Method.java:521)
08-30 17:09:30.442: E/AndroidRuntime(440): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-30 17:09:30.442: E/AndroidRuntime(440): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-30 17:09:30.442: E/AndroidRuntime(440): at dalvik.system.NativeStart.main(Native Method)
08-30 17:09:30.442: E/AndroidRuntime(440): Caused by: java.lang.reflect.InvocationTargetException
08-30 17:09:30.442: E/AndroidRuntime(440): at com.Map.zoomIn(MapScreen.java:762)
08-30 17:09:30.442: E/AndroidRuntime(440): at java.lang.reflect.Method.invokeNative(Native Method)
08-30 17:09:30.442: E/AndroidRuntime(440): at java.lang.reflect.Method.invoke(Method.java:521)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.view.View$1.onClick(View.java:2067)
08-30 17:09:30.442: E/AndroidRuntime(440): ... 11 more
08-30 17:09:30.442: E/AndroidRuntime(440): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
08-30 17:09:30.442: E/AndroidRuntime(440): at android.graphics.Bitmap.nativeCreate(Native Method)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
08-30 17:09:30.442: E/AndroidRuntime(440): at android.graphics.Bitmap.createBitmap(Bitmap.java:435)
08-30 17:09:30.442: E/AndroidRuntime(440): at com.Map.ncore.XtraFunctions.ScaleBitmap(ExtraFunctions.java:32)
08-30 17:09:30.442: E/AndroidRuntime(440): at com.Map.MapCanvas.zoomIn(MapCanvas.java:1018)
08-30 17:09:30.442: E/AndroidRuntime(440): ... 15 more
08-30 17:14:30.522: I/Process(440): Sending signal. PID: 440 SIG: 9