While cycle loop in Java example
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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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Issue:
When using New Activity wizard, ADT 20 asked to install Android Support library version 8 even though version 9 has been installed.
Pressing "Install/Update" then ADT popup a window downloading Support library, when finished nothing happen.
Pressing "Check Again" does nothing.
If i restarting Eclipse again this problem.
Notice: If you install new version ADT or update via SDK Manager, open SDK Manager standalone and close Eclipse.
Workaround:
- Close Eclipse
- Open SDK Manager standalone (c:\Program Files\Android\android-sdk-windows\SDK Manager.exe)
- Check the checkbox and uninstall Extras -> Android Support Library.
- Check again Extras -> Android Support Library and install it
- Restart Eclipse
- Try to create new project

When using New Activity wizard, ADT 20 asked to install Android Support library version 8 even though version 9 has been installed.
Pressing "Install/Update" then ADT popup a window downloading Support library, when finished nothing happen.
Pressing "Check Again" does nothing.
If i restarting Eclipse again this problem.
Notice: If you install new version ADT or update via SDK Manager, open SDK Manager standalone and close Eclipse.
Workaround:
- Close Eclipse
- Open SDK Manager standalone (c:\Program Files\Android\android-sdk-windows\SDK Manager.exe)
- Check the checkbox and uninstall Extras -> Android Support Library.
- Check again Extras -> Android Support Library and install it
- Restart Eclipse
- Try to create new project


If you using GoogleAdMobAdsSdk-4.0.4.jar in your project and set android:targetSdkVersion="17" in AndroidManifest.xml , ads will not visible on emulator with Android 4.0.3 or 4.1.
You have to set as android:targetSdkVersion="17"
Update project.properties file - row with target to 17:
You have to set as android:targetSdkVersion="17"
<uses-sdk android:minSdkVersion="4"
android:targetSdkVersion="17" />
Update project.properties file - row with target to 17:
# Project target.
target=android-17
If some memory leak - problem try release of memory used of a big Bitmap what already not to need;
//developer.android.com/reference/android/graphics/Bitmap.html
Free the native object associated with this bitmap, and clear the reference to the pixel data. This will not free the pixel data synchronously; it simply allows it to be garbage collected if there are no other references. The bitmap is marked as "dead”, meaning it will throw an exception if getPixels() or setPixels() is called, and will draw nothing. This operation cannot be reversed, so it should only be called if you are sure there are no further uses for the bitmap. This is an advanced call, and normally need not be called, since the normal GC process will free up this memory when there are no more references to this bitmap.
Bitmpap bmp; // not null
bmp.recycle();
bmp = null;
final boolean bmpIsRecycled = bmp.isRecycled()
// Returns true if this bitmap has been recycled.
//developer.android.com/reference/android/graphics/Bitmap.html
Free the native object associated with this bitmap, and clear the reference to the pixel data. This will not free the pixel data synchronously; it simply allows it to be garbage collected if there are no other references. The bitmap is marked as "dead”, meaning it will throw an exception if getPixels() or setPixels() is called, and will draw nothing. This operation cannot be reversed, so it should only be called if you are sure there are no further uses for the bitmap. This is an advanced call, and normally need not be called, since the normal GC process will free up this memory when there are no more references to this bitmap.
drawPath, canvas.rotate, lineTo basic Android example for your testing.
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// //www.apache.org/licenses/LICENSE-2.0
// The Android Open Source Project
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint mPaint = new Paint();
private Path mPath = new Path();
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
// Construct a wedge-shaped path
mPath.moveTo(0, -60);
mPath.lineTo(-20, 80);
mPath.lineTo(0, 60);
mPath.lineTo(20, 80);
mPath.close();
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = mPaint;
canvas.drawColor(Color.WHITE);
paint.setAntiAlias(true);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.FILL);
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.flower_blue);
canvas.drawBitmap(bitmapOrg, 10, 10, paint);
int w = canvas.getWidth();
int h = canvas.getHeight();
int cx = w / 2;
int cy = h / 2;
canvas.translate(cx, cy);
// uncomment next line
//canvas.rotate(90.0f);
canvas.drawPath(mPath, mPaint);
}
}
}
public boolean isConnected() {
try {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("isConnected", e.getMessage());
Toast.makeText(getApplicationContext(), e.getMessage(),
Toast.LENGTH_LONG).show();
return false;
}
Editace: 2011-10-04 08:57:30
Počet článků v kategorii: 397
Url:while-cycle-loop-in-java-example
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