R cannot resolved to a variable in eclipse android

Question

This is my xml code R file is not generating please tell me where is the error and why R file is not generating

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#333333"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

<TextView
    android:id="@+id/SongName"
    android:layout_width="wrap_content"
    android:text="@string/songName"
    android:layout_height="wrap_content"/>


<ImageView
    android:id="@+id/s_mp3Image"
    android:layout_width="match_parent"
    android:layout_height="200dp"
     android:padding="30dp"
     android:contentDescription="@string/music"
    android:src="@drawable/music"
    android:background="#ffffff"
    android:layout_margin="30dp" />

<TextView
   android:id="@+id/songDuration"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/songDuration"
    android:layout_gravity="center"/>

<SeekBar
    android:id="@+id/s_seekBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="30dp"
    android:gravity="center_horizontal"
    android:orientation="horizontal" >

    <ImageButton
        android:id="@+id/s_media_rew"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="14dp"
        android:onClick="rewind"
        android:contentDescription="@string/ic_media_rew"
        android:src="@android:drawable/ic_media_rew" />

    <ImageButton
        android:id="@+id/s_media_pause"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="14dp"
        android:onClick="pause"
        android:contentDescription="@string/media_pause"
        android:src="@android:drawable/ic_media_pause" />

    <ImageButton
        android:id="@+id/s_media_play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="14dp"
        android:onClick="play"
        android:contentDescription="@string/ic_media_play"
        android:src="@android:drawable/ic_media_play" />

    <ImageButton
        android:id="@+id/s_media_ff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="14dp"
        android:onClick="forward"
        android:contentDescription="@string/ic_media_ff"
        android:src="@android:drawable/ic_media_ff" />
</LinearLayout>

and this is my java code

package com.example.androidmediaplayer;


import java.util.concurrent.TimeUnit;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.VideoView;

public class  MainActivity extends Activity {

private MediaPlayer mediaPlayer;
public TextView songName, duration;
private double timeElapsed = 0, finalTime = 0;
private int forwardTime = 2000, backwardTime = 2000;
private Handler durationHandler = new Handler();
private SeekBar seekbar;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //set the layout of the Activity
    setContentView(R.layout.activity_list_item);   //here R file has problem

    //initialize views
    initializeViews();
}

public void initializeViews(){
    songName=(TextView)findViewById(R.id.SongName);    //here R file has problem
    mediaPlayer = MediaPlayer.create(this, R.raw.sample);  //here
       finalTime = mediaPlayer.getDuration();
       duration = (TextView) findViewById(R.id.songDuration);  //here
       seekbar = (SeekBar) findViewById(R.id.s_seekBar); //here
       songName.setText("Sample_Song.mp3");
                 seekbar.setMax((int) finalTime);
    seekbar.setClickable(false);
}

// play mp3 song
public void play(View view) {
    mediaPlayer = new MediaPlayer();
    mediaPlayer.start();
    timeElapsed = mediaPlayer.getCurrentPosition();
    seekbar.setProgress((int) timeElapsed);
    durationHandler.postDelayed(updateSeekBarTime, 100);
}

//handler to change seekBarTime
@SuppressLint("NewApi")
private Runnable updateSeekBarTime = new Runnable() {

    @SuppressLint("NewApi")
    public void run() {
        //get current position
        timeElapsed = mediaPlayer.getCurrentPosition();
        //set seekBar progress
        seekbar.setProgress((int) timeElapsed);
        //set time remaining
        double timeRemaining = finalTime - timeElapsed;
                    duration.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining), TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining))));


        //repeat yourself that again in 100 milliseconds
        durationHandler.postDelayed(this, 100);
    }
};

// pause mp3 song
public void pause(View view) {
    mediaPlayer.pause();
}

// go forward at forwardTime seconds
public void forward(View view) {
    //check if we can go forward at forwardTime seconds before song 
    if ((timeElapsed + forwardTime) <= finalTime) {
        timeElapsed = timeElapsed + forwardTime;

        //seek to the exact second of the track
        mediaPlayer.seekTo((int) timeElapsed);
    }
}

// go backwards at backwardTime seconds
public void rewind(View view) {
    //check if we can go back at backwardTime seconds after song starts
    if ((timeElapsed - backwardTime) > 0) {
        timeElapsed = timeElapsed - backwardTime;

        //seek to the exact second of the track
        mediaPlayer.seekTo((int) timeElapsed);
    }
}

}

This is my code R file is not generating please tell me where is the error and why R file is not generating This is my xml code R file is not generating please tell me where is the error and why R file is not generating This is my xml code R file is not generating please tell me where is the error and why R file is not generating This is my xml code R file is not generating please tell me where is the error and why R file is not generating

http://stackoverflow.com/questions/4085959/no-generated-r-java-file-in-my-project — IntelliJ Amiya, May 04 '16 at 08:34
Check your xml files if it contains any error and then clean project and try again — AbhayBohra, May 04 '16 at 08:55

score 1 · Answer 1 · answered May 04 '16 at 08:29

1

You should try cleaning your project !!

answered May 04 '16 at 08:29

varunkr

5,364
11
50
99

I have clean my project but still same error!! – Cesar May 04 '16 at 08:56

score 0 · Answer 2 · answered May 04 '16 at 08:33

0

Try Clean your Project.

OR

Restart Eclipse.

Or

Check with All XML Resources you have used. Is their any missing things in your XML.

This case mostly happens when you have Something wrong with your XML Resources you are using.

answered May 04 '16 at 08:33

Jay Rathod

11,131
6
34
58

I have clean my project but still same error!! – Cesar May 04 '16 at 08:56
Check other case i have suggested in my answer. – Jay Rathod May 04 '16 at 09:03
@Cesar Have you get it working ? – Jay Rathod May 04 '16 at 10:51
no its is not working – Cesar May 04 '16 at 13:09
Have you checked all your XML file. is it showing you errors with Red mark or not ? please cross check that. – Jay Rathod May 04 '16 at 13:11
there is no error showing and no red mark showing – Cesar May 04 '16 at 16:05
Then i don't be able to assume. Do 1 thing delete `R.java` file from project and clean project it will generate new `R.java` file. – Jay Rathod May 04 '16 at 16:12
the problem is there R file is not generating there is no R file in in project – Cesar May 04 '16 at 16:15
Then i can only suggest you to create new project and copy all files in it. that will work now. – Jay Rathod May 04 '16 at 16:24
I can see in your xml i have checked that your `Linear Layout` missing closing tag. Add one more `` ata the end of your xml and then check. – Jay Rathod May 04 '16 at 16:27
I have added one more closing tag now error is coming that "This LinearLayout view is useless (no children, no background, no id, no style" – Cesar May 04 '16 at 17:10
Can you post your XML code in above Question. Edit your Question with new XML. – Jay Rathod May 04 '16 at 17:12

R cannot resolved to a variable in eclipse android

2 Answers2