SparseArray instead HashMap Android example
Old code with HashMap
Lint warning:
Use new SparseArray(...) instead for better performance
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays
New code with SparseArray
SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html
Map<Integer, Bitmap> _bitmapCache = new HashMap<Integer, Bitmap>();
private void fillBitmapCache() {
_bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
_bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
_bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
_bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(),
}
Bitmap bm = _bitmapCache.get(R.drawable.icon);
Lint warning:
Use new SparseArray
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays
New code with SparseArray
SparseArray<Bitmap> _bitmapCache = new SparseArray<Bitmap>();
private void fillBitmapCache() {
_bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
_bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
_bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
_bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(),
}
Bitmap bm = _bitmapCache.get(R.drawable.icon);
SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html
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public class MyClass extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
String sMyText = "some text";
int nMyInt = 10;
@Override
protected void onSaveInstanceState(Bundle outState) {
// Save away the original text, so we still have it if the activity
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outState.putString("my_text", sMyText);
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Eclipse.
If install on device signed with proguard *.apk package and try to reinstall it by only signed package get error in parsing the package.
Uninstall the first application with bigger size from device and try install signed package which has a smaller size. Delete from download list previous downloaded *.apk.
This problem occurs when that your downloaded apk file size is less than the
size of the original apk.
If install on device signed with proguard *.apk package and try to reinstall it by only signed package get error in parsing the package.
Uninstall the first application with bigger size from device and try install signed package which has a smaller size. Delete from download list previous downloaded *.apk.
This problem occurs when that your downloaded apk file size is less than the
size of the original apk.
While cycle Java basic example with array of strings.
MainClass.java
MainClass.java
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "Hello", "people", "hello", "world!" };
int i = 0;
while ( i < arrayOfString.length ){
System.out.println(arrayOfString[i]);
i++;
}
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}
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Try to close the mobile application on your device completely before starting again from Android Studio.Close every fragment.
The problem occurs when the application has multiple fragments.
Date: 13.07.2020 - 08:23
Editace: 2013-12-09 13:04:15
Počet článků v kategorii: 396
Url:sparsearray-instead-hashmap-android-example