Android custom View combination control and androidview Control

Android custom View combination control and androidview Control

First

LEDView effect.

Previously, I saw a blog using two textviews to achieve this effect. So I want to use a custom control to implement an LEDView, which can be used directly.

The combination of controls, the two textviews stacked together, and then use the digital-7.ttf font to display data, so as to achieve the LED effect. The Code is as follows:

LEDView. class

Package ione. zy. demo; import java. io. file; import java. util. calendar; import java. util. date; import java. util. timeZone; import android. annotation. suppressLint; import android. content. context; import android. content. res. assetManager; import android. graphics. typeface; import android. OS. handler; import android. util. attributeSet; import android. view. layoutInflater; import android. view. view; import android. widget. linearLayout; import android. widget. textView; public class LEDView extends LinearLayout {private TextView timeView; private TextView bgView; private static final String FONT_DIGITAL_7 = "fonts" + File. separator + "digital-7.ttf"; private static final String DATE_FORMAT = "% 02d: % 02d: % 02d"; private static final int REFRESH_DELAY = 500; private final Handler mHandler = new Handler (); private final Runnable mTimeRefresher = new Runnable () {@ Overridepublic void run () {Calendar calendar = Calendar. getInstance (TimeZone. getTimeZone ("GMT + 8"); final Date d = new Date (); calendar. setTime (d); timeView. setText (String. format (DATE_FORMAT, calendar. get (Calendar. HOUR), calendar. get (Calendar. MINUTE), calendar. get (Calendar. SECOND); mHandler. postDelayed (this, REFRESH_DELAY) ;};@ SuppressLint ("NewApi") public LEDView (Context context, AttributeSet attrs, int defStyle) {super (context, attrs, defStyle ); init (context);} public LEDView (Context context, AttributeSet attrs) {super (context, attrs); init (context);} public LEDView (Context context) {super (context); init (context);} private void init (Context context) {LayoutInflater layoutInflater = LayoutInflater. from (context); View view = layoutInflater. inflate (R. layout. ledview, this); timeView = (TextView) view. findViewById (R. id. ledview_clock_time); bgView = (TextView) view. findViewById (R. id. ledview_clock_bg); AssetManager assets = context. getAssets (); final Typeface font = Typeface. createFromAsset (assets, FONT_DIGITAL_7); timeView. setTypeface (font); // set the bgView font. setTypeface (font); // set the font} public void start () {mHandler. post (mTimeRefresher);} public void stop () {mHandler. removeCallbacks (mTimeRefresher );}}

Ledview. xml file

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >      <TextView          android:id ="@+id/ledview_clock_time"          android:layout_width ="wrap_content"          android:layout_height ="wrap_content"          android:layout_centerInParent="true"        android:shadowColor ="#00ff00"          android:shadowDx ="0"          android:shadowDy ="0"          android:shadowRadius ="10"          android:textColor ="#00ff00"          android:textSize ="80sp" />              <TextView        android:id ="@+id/ledview_clock_bg"           android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_centerInParent="true"        android:layout_gravity="center"          android:text="@string/default_time"          android:textColor="#3300ff00"          android:textSize="80sp" /> </RelativeLayout>

Use Demo

package ione.zy.demo;import android.os.Build;import android.os.Bundle;import android.view.Menu;import android.annotation.SuppressLint;import android.annotation.TargetApi;import android.app.ActionBar;import android.app.Activity;@TargetApi(Build.VERSION_CODES.HONEYCOMB)public class LEDActivity extends Activity {private LEDView ledView;@SuppressLint("NewApi")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_led);ledView = (LEDView) findViewById(R.id.ledview);  ActionBar actionBar = getActionBar();    actionBar.setDisplayHomeAsUpEnabled(true); }@Overrideprotected void onResume() {super.onResume();ledView.start();}@Overrideprotected void onStop() {super.onStop();ledView.stop();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_led, menu);return true;}}

Activity_led.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".LEDActivity"    android:background="@color/black" >   <ione.zy.demo.LEDView         android:id="@+id/ledview"        android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_centerInParent="true"        android:layout_gravity="center"  />  </RelativeLayout>

Download Demo

Android custom View widget

Your buttons and textview are not initialized. It is strange that you do not report a null pointer.

When does Android use custom views?

There are two types of android applications: software and game.
Generally, the software does not use custom views and uses the android built-in controls, because the android built-in controls can already meet the needs of general applications.
However, the game uses the android built-in controls to make a very good result, because the game is diversified, various characters, various items, various interfaces, and various effects. Therefore, the game uses a custom View or SurfaceView as the screen content.

In fact, it is not clear whether you want to ask this question. Are you satisfied with this answer?