How setcontentview in a new activity depending on the button clicked

Question

I've been searching the forum but can't seem to find what I'm looking for... I've got a xml with some 40 buttons. Whenever a specific button is clicked I want to open a new activity and set the contentview depending on the button clicked. Opening the new activity is no problem but I can't figure out how to set the contentview to the right image...

My xml file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/margin_regular"
        android:layout_marginRight="@dimen/margin_regular"
        android:layout_marginTop="3dp"
        android:orientation="horizontal" >

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/chromatic_scale_bflat" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="3dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn_bes1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/bes"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:id="@+id/btn_b1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/b"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:id="@+id/btn_c1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/c"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:id="@+id/btn_cis1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/cis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:id="@+id/btn_d1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/d"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:id="@+id/btn_dis1"
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/dis"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="1dp"
        android:orientation="horizontal" >

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/e"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/f"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/fis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/g"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/gis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/a"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp" >

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/chromatic_scale_bflat" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="3dp"
        android:orientation="horizontal" >

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/bes"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/b"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/c"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/cis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/d"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/dis"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="1dp"
        android:orientation="horizontal" >

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/e"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/f"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/fis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/g"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/gis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/a"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp" >

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/chromatic_scale_bflat" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="3dp"
        android:orientation="horizontal" >

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/bes"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/b"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/c"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/cis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/d"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/dis"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="1dp"
        android:orientation="horizontal" >

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/e"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/f"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/fis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/g"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/gis"
            android:textSize="@dimen/button_textsize" />

        <Button
            android:layout_width="54dp"
            android:layout_height="40dp"
            android:text="@string/a"
            android:textSize="@dimen/button_textsize" />
    </LinearLayout>

</LinearLayout>

My Java file:

package com.example.saxofoonnieuw;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FingeringChart extends Activity implements OnClickListener {

    Button bes1, b1, c1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fingering_chart);

        bes1 = (Button) findViewById(R.id.btn_bes1);
        bes1.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_bes1:
            Intent a = new Intent(this, PictureFingeringChart.class);
            startActivity(a);

            break;

        default:
            break;
        }
    }

}

Answer 1

You should add Extra info in your Intent as is:

In your code pass an image_name String variable into your intent:

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.btn_bes1:
        Intent a = new Intent(this, PictureFingeringChart.class);
        String strName = "image_2"; // this variable changes for each button
        a.putExtra("image_name", strName);
        startActivity(a);

        break;

    default:
        break;
    }
}

Now get the variable name in your destination activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fingering_chart);

    Intent intent = getIntent();
    String image_name = intent.getStringExtra("image_name");

    // now you have the image_name and you can go on... 

    // 1st get the reference to your ImageView :
    ImageView img = (ImageView) findViewById(R.id.image);
    // 2nd assume you pass as string param the name of the drawable, in this example, regarding previous code, we would like to load image_2.png, so we retrieve the corresponding resource ID like this :
    int resourceID = getResources().getIdentifier(image_name , "drawable", getPackageName());
    // 3rd then we assign it to our ImageView :
    img.setImageResource(resourceID);
    // 4th done!
}