vxhviet

Source: my own question and aswer on StackOverflow

Question: How to show only half of a roatating wheel?

Answer:

• Simple answer for simple case we dont need to create custom imageview SOURCE.

First we would want tooverride the onDraw method of our customized ImageView to draw the image using an updated Matrix on touch event. This guarantee performance as the image doesn't get redrawn everytime.

vxhviet

Source: StackOverflow

Question: I have a poorly designed class in a 3rd-party JAR and I need to access one of its private fields. How can I do that with reflection?

public class StupidClass{
  private RectF stupidRectf;
}

vxhviet

Source: tutsplus, StackOverflow

Question: How to know when a view fully created?

Answer:

Since we only know after measuring the layout how much space our ImageView fills, we add an OnGlobalLayoutListener. In the onGlobalLayout method, we can intercept the event that the layout has been drawn and query the size of our view.

 yourView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

vxhviet

Source: StackOverflow

Question: How to define Views width by percentage?

Answer:

You are looking for the android:layout_weight attribute. It will allow you to use percentages to define your layout.

In the following example, the left button uses 70% of the space, and the right button 30%.

vxhviet

Question: How to connect with phone via wifi?

Answer:

Connect the phone via usb cable.

Open text editor put in the following and save it as wifiConnect.bat:

cd C:\Users\Viet\AppData\Local\Android\sdk\platform-tools

vxhviet

Source: StackOverflow

Question: How to access the object that call setOnClickListener() from inside the listener?

Answer:

In your onClick(View v) you can cast it to your object:

Button button = (Button) findViewById(R.id.button_id);

vxhviet

Source: StackOverflow, StackOverflow

Question: How to Apply Color LUT to bitmap images for filter effects in Android?

Answer:

    final static int X_DEPTH = 64;
    final static int Y_DEPTH = 64; //One little square in the LUT has 64x64 pixels in it
    final static int ROW_DEPTH = 8;

vxhviet

Source: StackOverflow, StackOverflow

Question: How to switch selected ImageViews border using selector?

Answer:

In your dimens.xml:

<resources>

vxhviet

Question: How to add external AAR library to Android Studio?

Answer:

This work on Android Studio 2.0

File > New > New Module > Import .JAR/.AAR Package > Choose your AAR file.

Add dependency:

vxhviet

Source: grokkingandroid

Question: How to refresh MediaStore upon adding new files in Android

Answer:

Visit source for additional methods.

Using the static scanFile() method