چگونه در اندروید شیئ سفارشی ایجاد کنیم

  <?xml version="1.0" encoding="utf-8"?>

<resources>

   <declare-styleable name="TimeView">

      <declare-styleable name="TimeView">

         <attr name="title" format="string" />

         <attr name="setColor" format="boolean"/>

      </declare-styleable>

   </declare-styleable>

</resources>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

   xmlns:tools="http://schemas.android.com/tools"

   xmlns:custom="http://schemas.android.com/apk/res-auto"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   tools:context=".MainActivity" >

   <com.example.tutorialspoint7.myapplication.TimeView

      android:id="@+id/timeView"

      android:layout_width="match_parent"

      android:layout_height="wrap_content"

      android:textColor="#fff"

      android:textSize="40sp"

      custom:title="my time view"

      custom:setColor="true" />

   <TextView

      android:layout_width="match_parent"

      android:layout_height="wrap_content"

      android:id="@+id/simple"

      android:layout_below="@id/timeView"

      android:layout_marginTop="10dp" />

</RelativeLayout>

package com.example.tutorialspoint7.myapplication;

/**

 * Created by TutorialsPoint7 on 9/14/2016.

 */

import java.text.SimpleDateFormat;

import java.util.Calendar;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Color;

import android.util.AttributeSet;

import android.widget.TextView;

public class TimeView extends TextView {

   private String titleText;

   private boolean color;

   public TimeView(Context context) {

      super(context);

      setTimeView();

   }

   public TimeView(Context context, AttributeSet attrs) {

      super(context, attrs);

      // retrieved values correspond to the positions of the attributes

         TypedArray typedArray = context.obtainStyledAttributes(attrs,

            R.styleable.TimeView);

      int count = typedArray.getIndexCount();

      try{

         for (int i = 0; i < count; ++i) {

            int attr = typedArray.getIndex(i);

            // the attr corresponds to the title attribute

            if(attr == R.styleable.TimeView_title) {

               // set the text from the layout

               titleText = typedArray.getString(attr);

               setTimeView();

            } else if(attr == R.styleable.TimeView_setColor) {

               // set the color of the attr "setColor"

               color = typedArray.getBoolean(attr, false);

               decorateText();

            }

         }

      }

      // the recycle() will be executed obligatorily

      finally {

         // for reuse

         typedArray.recycle();

      }

   }

   public TimeView(Context context, AttributeSet attrs, int defStyle) {

      super(context, attrs, defStyle);

      setTimeView();

   }

   private void setTimeView() {

      // has the format hour.minuits am/pm

      SimpleDateFormat dateFormat = new SimpleDateFormat("hh.mm aa");

      String time = dateFormat.format(Calendar.getInstance().getTime());

      if(this.titleText != null )

      setText(this.titleText+" "+time);

      else

         setText(time);

   }

   private void decorateText() {

      // when we set setColor attribute to true in the XML layout

      if(this.color == true){

         // set the characteristics and the color of the shadow

         setShadowLayer(4, 2, 2, Color.rgb(250, 00, 250));

         setBackgroundColor(Color.CYAN);

      } else {

         setBackgroundColor(Color.RED);

      }

   }

}

package com.example.tutorialspoint7.myapplication;

import android.os.Bundle;

import android.widget.TextView;

import android.app.Activity;

public class MainActivity extends Activity {

   @Override

   protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_main);

      TextView simpleText = (TextView) findViewById(R.id.simple);

      simpleText.setText("That is a simple TextView");

   }

}