java - How to convert an array to a list

MainActivity.java 
 package com.cfsuman.me.javaexamples;  import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Window; import android.widget.RelativeLayout; import android.widget.TextView; import android.content.Context;  import java.util.ArrayList; import java.util.Arrays; import java.util.List;  public class MainActivity extends AppCompatActivity {     private Context mContext;     private String mTitle = "Java - How to convert array to list";      @Override     protected void onCreate(Bundle savedInstanceState) {         requestWindowFeature(Window.FEATURE_ACTION_BAR);         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          mContext = getApplicationContext();         getSupportActionBar().setTitle(mTitle);         getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.RED));          // Get widget reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         TextView tv =(TextView) findViewById(R.id.tv);          // Empty the TextView         tv.setText("");          // Initialize an int array         int[] intArray = new int[]{1,2,3,4,5,6};          // Initialize an Integer array with elements         Integer[] integerArray = new Integer[]{1,2,3,4,5,6,7,8,9};          // Initialize a new String array         String[]  stringArray = new String[]{"Red","Green","Blue","Yellow","Black"};          // Convert Integer array to list         List<Integer> integerList = Arrays.asList(integerArray);          // Convert String array to list         List<String> stringList = Arrays.asList(stringArray);          // Another way to convert Integer array to list         ArrayList<Integer> secondIntegerList = new ArrayList<>(Arrays.asList(integerArray));          // We applied a technique to get an Integer list from an int array         List<Integer> thirdIntegerList = new ArrayList<>();         for(int i=0;i<intArray.length;i++){thirdIntegerList.add(intArray[i]);}          tv.setText(tv.getText() + "Integer list : ");         // Iterate through Integer list         for (int i=0;i<integerList.size();i++){             tv.setText(tv.getText() + "" + integerList.get(i) + ", ");         }          tv.setText(tv.getText() + "\nSecond Integer list : ");         // Iterate through second Integer list         for (int i=0;i<secondIntegerList.size();i++){             tv.setText(tv.getText()+ "" + secondIntegerList.get(i) + ", ");         }          tv.setText(tv.getText() + "\n\nThird Integer list (from int array): ");         // Loop through third Integer list         for (int i=0;i<thirdIntegerList.size();i++){             tv.setText(tv.getText()+ "" + thirdIntegerList.get(i) + ", ");         }          tv.setText(tv.getText() + "\n\nString list : ");         // Iterate through String list elements         for (int i=0;i<stringList.size();i++){             tv.setText(tv.getText()+ "" + stringList.get(i) + ", ");         }     } }
More android examples

Komentar

Posting Komentar