Android TV achieves color bar scrolling, androidtv

Android TV achieves color bar scrolling, androidtv

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ColorView. java

Package com. xxx. demo; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. util. attributeSet; import android. util. log; import android. view. view; import android. view. windowManager;/*** color effect view1 */public class ColorView extends View {int width; int height; Paint p; int I = 0; int all = 256*5; // color value change int exteraLength = 1; Context context = null; int j = 0; int mLength = 0; // The addition value of j for each re-painting public ColorView (Context context) {super (context ); this. context = context; WindowManager wm = (WindowManager) getContext (). getSystemService (Context. WINDOW_SERVICE); width = wm. getdefadisplay display (). getWidth (); height = wm. getdefadisplay display (). getHeight (); // determines whether it is a standard height System. out. println ("width =" + width); System. out. println ("heig Ht = "+ height); p = new Paint (); if (all> = width) {mLength = 80;} else {mLength = 30; exteraLength = (int) math. ceil (1.0 * all/(width-all);} this. setFocusable (true); this. setKeepScreenOn (true); I = 0;} public ColorView (Context context, AttributeSet attributeSet) {super (context, attributeSet); this. context = context; WindowManager wm = (WindowManager) getContext (). getSystemService (Con Text. WINDOW_SERVICE); width = wm. getdefadisplay display (). getWidth (); height = wm. getdefadisplay display (). getHeight (); System. out. println ("width =" + width); System. out. println ("height =" + height); p = new Paint (); p. setAntiAlias (true); p. setStyle (Paint. style. FILL); if (all> = width) {mLength = 80;} else {mLength = 30; exteraLength = (int) Math. ceil (1.0 * all/(width-all);} this. setFocusable (true); This. setKeepScreenOn (true); I = 0 ;}@ Override protected void onDraw (Canvas canvas) {super. onDraw (canvas); if (j> all) {// indicates the end. Still need to be drawn, otherwise the interface will become black myDraw (canvas); System. out. println ("end"); return;} myDraw (canvas); j + = mLength; // change the value of j to invalidate (); // redraw the view after onDraw, subjective animation} public void myDraw (Canvas canvas) {// create a paint brush // red (R: 255G: 0 B: 0) // orange (R: 255G: 156 B: 0) // yellow (R: 255G: 255 B: 0) // Green (R: 0G: 255 B: 0) // blue (R: G: 255 B: 255) // blue (R: 0G: 0 B: 255) // purple (R: 255G: B: 255) system. out. println ("canvas"); Log. I ("Canvas: X:", "complexdraw"); I = 0; while (I <= j) {if (I <= 255) {p. setColor (Color. rgb (255, I, 0);} else if (I >=256 & I <= 511) {p. setColor (Color. rgb (511-I, 255, 0);} else if (I >= 512 & I <= 767) {p. setColor (Color. rgb (0,255, I-512);} else if (I >=768 & I <= 1023) {p. setColor (Color. rgb (0, 1023-I, 255);} else if (I >= 1024 & I <= 1279) {p. setColor (Color. rgb (I-1024, 0,255);} // processing different resolutions, resulting in differences in drawing, evenly divided color values, screen width 12 80. The color value range is also 1280. For Xiaomi TV, the screen width is 1920. if the screen width is exceeded, it needs to be evenly divided. The following is the processing method if (exteraLength! = 1) {if (I % exteraLength = exteraLength-1) {System. out. println ("exteraLength =" + exteraLength); System. out. println ("current =" + I); canvas. drawLine (I + I/exteraLength, 0, I + I/exteraLength, height, p); // draw a canvas. drawLine (I + I/exteraLength + 1, 0, I + I/exteraLength + 1, height, p);} else {System. out. println ("exteraLength = 1 --------->" + exteraLength); System. out. println ("current =" + I); canvas. drawLine (I + I/exteraLength, 0, I + I/exteraLength, height, p) ;}} else {canvas. drawLine (I, 0, I, height, p) ;} I ++ ;}}}

MainActivity. java

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_color);    }}

Activity_color.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="fill_parent"              android:layout_height="fill_parent">    <com.xxx.demo.ColorView            android:id="@+id/colorView"            android:layout_width="fill_parent"            android:layout_height="fill_parent"            /></LinearLayout>

In the onDraw () method of the custom view, the invalidate () method can be called to achieve the effect similar to moving a ball ..

How can I scroll part of the android xml layout out of the screen?

Try writing the height of the control in ScrollView

In android, how does one click the button to scroll the image?

First, viewpager and gallery should not make such errors;
Secondly, although gallery has expired, it can still be used. We recommend that you use it because the two replacement schemes mentioned in the API are used to achieve this effect, it is not as convenient as gallery;
This effect is very simple. horizontal layout: buttons + gallery + buttons;
You can use gallery on your own. There are a lot of materials;