Android : How to call/invoke classes for repetitive buttons in different activities

I have in my app about 20 activities with the same buttons in each activity, so I'm trying to have a class for each button to avoid repeating the same code in each activity. how ever I have no idea how to do that or how to call them in the activity:

here's an example of the content of the button that are repeated in every activity code: (i5,i6,i7...are the buttons variables)

    i5.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

    p++;

    switch (p) {
    case 1:
        Typeface tf3 = Typeface.createFromAsset(getAssets(),
                "fonts/dubai.TTF");
        t2.setTypeface(tf3);

        break;

    case 2:
        Typeface tf4 = Typeface.createFromAsset(getAssets(),
                "fonts/kacstpen.ttf");

        t2.setTypeface(tf4);

        ;
        break;
    case 3:
        Typeface tf5 = Typeface.createFromAsset(getAssets(),
                "fonts/mohammad.ttf");
        t2.setTypeface(tf5);

        break;

    case 4:
        Typeface tf6 = Typeface.createFromAsset(getAssets(),
                "fonts/nassim.ttf");
        t2.setTypeface(tf6);
        p = 0;
        break;

    }

}

});

i10.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    Intent i = new Intent(getApplicationContext(), Content12.class);
    startActivity(i);
    overridePendingTransition(R.anim.pushin, R.anim.pushout);

}
});
i8.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    Intent i = new Intent(getApplicationContext(), Content10.class);
    startActivity(i);
    overridePendingTransition(R.anim.pushinright,
            R.anim.pushoutright);

}
});
i1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    Intent i = new Intent(getApplicationContext(), Info.class);
    startActivity(i);
    overridePendingTransition(R.anim.pushinhorizontal,
            R.anim.pushouthorizontal);

}
});
i12.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    Intent i = new Intent (getApplicationContext(), Apps.class);
    startActivity(i);
    overridePendingTransition(R.anim.pushin, R.anim.pushout);

}
});

i3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    o++;

    switch (o) {
    case 1:
        layout2.setBackgroundResource(R.drawable.bac10);

        break;
    case 2:
        layout2.setBackgroundColor(Color.parseColor("#95B9C7"));

        break;
    case 3:

        layout2.setBackgroundColor(Color.parseColor("#82CAFA"));

        break;
    case 4:
        layout2.setBackgroundColor(Color.parseColor("#CCFFFF"));

        break;
    case 5:
        layout2.setBackgroundColor(Color.parseColor("#6CC417"));

        break;
    case 6:
        layout2.setBackgroundColor(Color.parseColor("#8AFB17"));

        break;
    case 7:

        layout2.setBackgroundColor(Color.parseColor("#FFA500"));

        break;
    case 8:

        layout2.setBackgroundColor(Color.parseColor("#ADD8E6"));

        break;
    case 9:

        layout2.setBackgroundColor(Color.parseColor("#E6A9EC"));

        break;
    case 10:

        layout2.setBackgroundColor(Color.parseColor("#87F717"));

        break;
    case 11:
        layout2.setBackgroundColor(Color.parseColor("#F9966B"));

        break;
    case 12:
        layout2.setBackgroundResource(R.drawable.bac6);

        break;

    default:

        layout2.setBackgroundResource(R.drawable.backbleu);

        o = 0;

    }

}

});

i4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    r++;

    switch (r) {
    case 1:
        t2.setTextColor(Color.parseColor("#151B54"));

        break;
    case 2:
        t2.setTextColor(Color.parseColor("#254117"));

        break;
    case 3:

        t2.setTextColor(Color.parseColor("#AF7817"));

        break;

    case 4:
        t2.setTextColor(Color.MAGENTA);

        break;
    case 5:
        t2.setTextColor(Color.parseColor("#0000A0"));

        break;
    case 6:

        t2.setTextColor(Color.parseColor("#C0C0C0"));

        break;
    case 7:
        t2.setTextColor(Color.parseColor("#8C001A"));

        break;
    case 8:
        t2.setTextColor(Color.parseColor("#437C17"));

        break;
    case 9:
        t2.setTextColor(Color.parseColor("#4B0082"));

        break;
    case 10:

        t2.setTextColor(Color.parseColor("#800517"));

        break;
    case 11:
        t2.setTextColor(Color.RED);

        break;
    case 12:
        t2.setTextColor(Color.GREEN);

        break;
    case 13:

        t2.setTextColor(Color.parseColor("#C11B17"));

        break;
    default:
        t2.setTextColor(Color.BLACK);

        r = 0;
    }

}

});

i6.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {

    if (i < 50)
        i = i + 2;
    t2.setTextSize(i);

}

 });
 i7.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {

    if (i > 16)
        i = i - 2;
    t2.setTextSize(i);

}

});

i9.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
    finish();
    overridePendingTransition(R.anim.pushinright,
            R.anim.pushoutright);

}
});