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Java in Android, Problems in array


Java in Android, Problems in array

By : iY-D
Date : November 22 2020, 10:54 AM
I wish this helpful for you I'm trying to use the array in my android program. , The statement
code :
TextView[] answer = { new TextView(this) };
public class MainActivity extends Activity {
    private TextView[ ] answer;


    @Override
    public void onCreate(Bundle savedInstanceState) {
       ...
       answer = new TextView[] { new TextView(this) };
    }
   ....
}


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Java problems with moving class objects into an array. Not sure if there is a fault with the constructors or the array d

Java problems with moving class objects into an array. Not sure if there is a fault with the constructors or the array d


By : user3333307
Date : March 29 2020, 07:55 AM
hope this fix your issue Almost everything is OK here ;) There are many ways. Simply access songDetails from nonstatic method (and change Music fields to nonstatic, and implement Music constructor):
code :
public class TryMusic {      

    Music song1 = new Music("song name", 5.32, 10);
    Music song2 = new Music("billy", 1.2, 8);
    Music song3 = new Music("hello", 1.5, 9);
    //Create array and make posistion 0 = song1
    Music[] songDetails;// = new Music[3];

    {
       //some initializations goes here
       //...
       //create array when you know how many songs you have
       songDetails = new Music[3];
       // and now fill the array. Possibly iteration? if no then simply use {} syntax
        songDetails[0] = song1;
        songDetails[1] = song2;
        songDetails[2] = song3;
    }

    public void go() {
        //print first place in array
        System.out.println(songDetails[0]);
    }

    public static void main(String[] args) {
        new TryMusic().go();
    }
}
public class TryMusic {

    //Create array and make posistion 0 = song1
    Music[] songDetails;// = new Music[3];

    {
        //if you still need initialization block, but don't need field for each song
        songDetails = new Music[3];
        //possibly iteration? if no then simply use {} syntax instead
        songDetails[0] = new Music("song name", 5.32, 10);
        songDetails[1] = new Music("billy", 1.2, 8);
        songDetails[2] = new Music("hello", 1.5, 9);
    }

    public void go() {
        //print first place in array
        System.out.println(songDetails[0]);
    }

    public static void main(String[] args) {
        new TryMusic().go();
    }
}
public class TryMusic {

    //Create array and make posistion 0 = song1
    //if simply array is enough
    Music[] songDetails = { new Music("song name", 5.32, 10),
         new Music("billy", 1.2, 8),
        new Music("hello", 1.5, 9)
    };

    public void go() {
        //print first place in array
        System.out.println(songDetails[0]);
    }

    public static void main(String[] args) {
        new TryMusic().go();
    }
}
public class TryMusic {

    //Create array and make posistion 0 = song1
    List<Music> songDetails = new ArrayList(){{
       add(new Music("song name", 5.32, 10));
       add(new Music("song name", 5.32, 10));
       add(new Music("hello", 1.5, 9));
    }};


    public void go() {
        //print first place in array
        System.out.println(songDetails.get(0));
    }

    public static void main(String[] args) {
        new TryMusic().go();
    }
}
public class TryMusic {

//Create array and make posistion 0 = song1
static Music[] songDetails = new Music[3];
static {
    songDetails[0] = new Music("song name", 5.32, 10);
    songDetails[1] = new Music("billy", 1.2, 8);
    songDetails[2] = new Music("hello", 1.5, 9);
}


public static void main(String[] args) {
    System.out.println(songDetails[0]);
}

}
    public class TryMusic {

    //Create array and make posistion 0 = song1
    static List<Music> songDetails = new ArrayList(){{
       add(new Music("song name", 5.32, 10));
       add(new Music("song name", 5.32, 10));
       add(new Music("hello", 1.5, 9));
    }};

    public static void main(String[] args) {
        System.out.println(songDetails.get(0));
    }
}
public class Music {

    private String songTitle;
    private double songLength;
    private int rating;

    public Music(String songTitle, double songLength, int rating) {
        this.songTitle = songTitle;
        this.songLength = songLength;
        this.rating = rating;

    }

    public String getsongTitle() {
        return songTitle;
    }

    public double getsongLength() {
        return songLength;
    }

    public int rating() {
        return rating;
    }

    @Override
    public String toString() {
        return "Music{" + "songTitle=" + songTitle + ", songLength=" + songLength + ", rating=" + rating + '}';
    }
}
Problems launching Android java project in a Android Virtual Machine using Eclipse

Problems launching Android java project in a Android Virtual Machine using Eclipse


By : Grewal
Date : March 29 2020, 07:55 AM
Hope this helps Do you Run your project or only start an emulator? After starting emulator, click Run button and select "Run as Android project".
problems sending 2d array to another layout android eclipse java

problems sending 2d array to another layout android eclipse java


By : Sergiusz Koczanowski
Date : March 29 2020, 07:55 AM
I wish this help you there are couple of methods to do that but i think in your case its best suited if you make your 2d array static.
code :
static double grid = new double[2][long];
double[][] dataX =Activity1.grid[][];   
Rendering Problems: java.lang.NullPointerException at android.support.v7.widget.RecyclerView in Android Studio 1.1.0

Rendering Problems: java.lang.NullPointerException at android.support.v7.widget.RecyclerView in Android Studio 1.1.0


By : jpm
Date : March 29 2020, 07:55 AM
it helps some times My problem was solved when I took out this line from the xml file for the RecyclerView:
code :
android:scrollbars="vertical"
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.0.0'
    compile 'com.android.support:recyclerview-v7:22.0.0'
    compile 'com.android.support:cardview-v7:22.0.0'
}
Android R.java problems. R.java file does not update?

Android R.java problems. R.java file does not update?


By : Roger Penn
Date : March 29 2020, 07:55 AM
it should still fix some issue Project -> Clean works for me. R.java is deleted & Auto generated.
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